TLE9271QX [INFINEON]
The device is designed for various CAN-LIN automotive applications as the main supply forthe microcontroller and as the interface for LIN and CAN bus networks.;
| 型号： | TLE9271QX |
| 厂家： | 
Infineon |
| 描述： | The device is designed for various CAN-LIN automotive applications as the main supply forthe microcontroller and as the interface for LIN and CAN bus networks. |
| 文件： | 总130页 (文件大小：4216K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OPTIREG™ SBC TLE9271QX
High-End System Basis Chip Family
1
Overview
Features
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Very low quiescent current consumption in SBC Stop and Sleep mode
SMPS 750 mA (DC/DC buck) voltage regulator 5 V to supply high current load with high efficiency
DC/DC boost converter for low battery supply voltage
Low-drop voltage regulator 5 V/100 mA, protected for off-board usage
High-speed CAN FD transceiver compliant to ISO11898-2:2016 supporting communication up to 5 Mbps
Up to 2 LIN transceivers LIN2.2, SAE J2602 with programmable TXD timeout feature and LIN Flash mode
Compliant with “Hardware requirements for LIN, CAN and FlexRay interfaces in automotive applications”
Revision 1.3, 2012-05-04
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One universal high-voltage wake input for voltage level monitoring
Configurable wake-up sources including periodic cyclic wake in SBC Normal and Stop mode
Configurable timeout and window watchdog and reset output
Fail-safe input to monitor MCU hardware functionality
Up to three fail-safe outputs (depending on configurations) to activate external loads in case of system
malfunctions are detected
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Overtemperature and short circuit protection feature
Software compatible with latest Infineon SBC families
PG-VQFN-48 leadless exposed-pad power package with Lead Tip Inspection (LTI)
Green Product (RoHS compliant)
Potential applications
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Body control modules
Gateway
HVAC ECU and control panel
Product validation
Qualified for automotive applications. Product validation according to AEC-Q100.
Datasheet
www.infineon.com/SBC
Rev. 2.0
2022-05-06
1
OPTIREG™ SBC TLE9271QX
Overview
Description
The TLE9271QX is a monolithic integrated circuit in an exposed pad PG-VQFN-48 (7 mm × 7 mm) leadless
package with Lead Tip Inspection (LTI) feature supporting Automatic Optical Inspection (AOI).
The device is designed for various CAN-LIN automotive applications as the main supply for the microcontroller
and as the interface for LIN and CAN bus networks.
The System Basis Chip (SBC) provides the main functions for supporting these applications, such as a Switch
mode power supply regulator (SMPS) for on-board 5 V supply, another 5 V low-dropout voltage regulator with
off-board protection, e.g. sensor supply, a DC/DC boost converter for low supply voltage, an HS-
CAN transceiver supporting CAN FD, a LIN transceiver for data transmission and a 16-bit Serial Peripheral
Interface (SPI) to control and monitor the device. Additional feature include a timeout/window watchdog
circuit with a reset feature, fail-safe input and fail-safe outputs and undervoltage reset features.
The device offers low-power modes in order to minimize current consumption on applications that are
connected permanently to the battery. A wake-up from the low-power mode is possible via a message on the
buses, via the bi-level sensitive monitoring/wake-up input as well as via cyclic wake.
The device is designed to withstand the severe conditions of automotive applications.
Scalable System Basis Chip (SBC) family
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Product family with various products for complete scalable application coverage
Dedicated datasheets are available for the different product variants
Complete compatibility (hardware and software) across the family
TLE9274 with 4 LIN transceivers, SMPS boost with 3 output voltage configurations
TLE9273 with 4 LIN transceivers, SMPS boost with 2 output voltage configurations
TLE9272 with 3 LIN transceivers, SMPS boost with 2 output voltage configurations
TLE9271 with 2 LIN transceivers, SMPS boost with 2 output voltage configurations
Product variants for 5 V (TLE927xQX) and 3.3 V (TLE927xQXV33) output voltage for main voltage regulator
Sales Product Name
OPN
Package
Marking
SP number
TLE9271QX
TLE9271QXXUMA2
SP005729424
PG-VQFN-48
TLE9271QX
Datasheet
2
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Table of contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Potential applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Product validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hints for unused pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
3.2
3.3
4
General product characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Functional range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1
4.2
4.3
4.4
5
5.1
System features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
State machine description and SBC mode control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SBC Init mode and device configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SBC Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SBC Stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SBC Sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SBC Restart mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SBC Fail-Safe mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SBC Development mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Wake features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Cyclic wake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Internal timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Supervision features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.2
5.2.1
5.2.2
5.3
6
6.1
6.2
DC/DC regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Functional description buck converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Startup procedure (soft start) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Buck regulator status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
External components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Functional description boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Boost regulator status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
External components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Peak overcurrent detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Boost switch gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
BSTG short circuit detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Power scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Buck and boost in SBC Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.2.1
6.2.2
6.2.3
6.3
6.3.1
6.3.2
6.3.2.1
6.3.3
6.3.4
6.4
6.4.1
Datasheet
3
Rev. 2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
6.4.2
Buck and boost in SBC Stop mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.4.2.1
6.4.2.2
6.4.2.3
6.4.3
6.4.3.1
6.5
Automatic transition from PFM to PWM in SBC Stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Manual transition from PFM to PWM in SBC Stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
SBC Stop to Normal mode transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Buck and boost in SBC Sleep and Fail-Safe mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
SBC Sleep/Fail-Safe mode to Normal mode transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7
Voltage regulator 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.1
7.2
7.3
8
8.1
8.2
High-speed CAN transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
CAN OFF mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
CAN Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
CAN Receive-Only mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
CAN Wake-capable mode (wake-up pattern) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
TXDCAN time-out feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Bus dominant clamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
VCAN undervoltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.2.1
8.2.2
8.2.3
8.2.4
8.2.5
8.2.6
8.2.7
8.3
9
9.1
9.1.1
9.2
LIN transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
LIN specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
LIN OFF mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
LIN Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
LIN Receive-Only mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
LIN Wake-Capable mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
TXDLIN Time-out feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Bus dominant clamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Undervoltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Slope selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Flash programming via LIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Electrical characteristics of the LIN transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
9.2.1
9.2.2
9.2.3
9.2.4
9.2.5
9.2.6
9.2.7
9.2.8
9.2.9
9.3
10
Wake input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Wake input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
10.1
10.2
10.2.1
10.3
11
11.1
11.2
Interrupt function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Block and functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
12
Fail-safe outputs and fail-safe input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Datasheet
4
Rev. 2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
12.1
12.2
12.3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Fail-safe input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
13
13.1
Supervision functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Reset function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Reset output description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Reset clamp to high . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Soft reset description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Watchdog function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Time-out watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Window watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Watchdog setting check sum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Watchdog during SBC Stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
WD start in SBC Stop mode due to bus wake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
VS power on reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Undervoltage VLIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Buck regulator monitoring features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
VCC1 undervoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
VCC1 overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
VCC1 short circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
SMPS status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
VCC2 undervoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
VCAN undervoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Individual thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Temperature prewarning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
SBC thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
13.1.1
13.1.2
13.1.3
13.2
13.2.1
13.2.2
13.2.3
13.2.4
13.2.4.1
13.3
13.4
13.5
13.5.1
13.5.2
13.5.3
13.5.4
13.6
13.7
13.8
13.8.1
13.8.2
13.8.3
13.9
14
Serial Peripheral Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
SPI description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Failure signalization in the SPI data output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
SPI programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
SPI bit mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
SPI control registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
SPI status information registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
14.1
14.2
14.3
14.4
14.5
14.6
14.7
15
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Application diagram with boost module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Application diagram without boost module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
ESD tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Thermal behavior of package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
15.1
15.2
15.3
15.4
16
17
Package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Datasheet
5
Rev. 2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Block diagram
2
Block diagram
VSENSE
VS
BSTD
BSTG
VCC1
Buck
Boost
BCKSW
VCC1
SNSP
SNSN
Vint.
VS2
FO1
FO2/FSI
FO3/TEST
Fail Safe
VCC2
VCC2
SDI
SDO
CLK
CSN
SPI
SBC
STATE
CFG
MACHINE
INT
Interrupt
Control
Window Watchdog
RO
RESET
GENERATOR
WK1
WK
VCAN
Vs
WAKE
REGISTER
TXDCAN
RXDCAN
CAN cell
VLIN
CANH
CANL
2
2
2
TXDLIN
RXDLIN
LIN1
LIN cell 1
LIN cell 2
TXDLIN
RXDLIN
LIN2
GND
Figure 1
Block diagram
Datasheet
6
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Pin configuration
3
Pin configuration
3.1
Pin assignment
CFG 37
CSN 38
SDO 39
SDI 40
CLK 41
GND 42
VCC2 43
VS2 44
24 RO
23 VCC1
22 RXDCAN
21 TXDCAN
20 VCAN
19 N.U.
TLE9271QX
PG-VQFN-48
18 N.U.
17 N.U.
VLIN 45
16 N.U.
FO1 46
FO2/FSI 47
FO3/TEST 48
15 RXDLIN2
14 TXDLIN2
13 RXDLIN1
Figure 2
Pin assignment
Datasheet
7
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Pin configuration
3.2
Pin definitions and functions
Table 1
Pin definitions and functions
Pin
Symbol
Function
1
LIN1
LIN bus 1
Bus line for the LIN interface, according to ISO 9141 and LIN specification 2.1 as
well as SAE J2602-2
2
3
GND
LIN2
Ground
LIN1 and LIN2 common ground
LIN bus 2
Bus line for the LIN interface, according to ISO 9141 and LIN specification 2.1 as
well as SAE J2602-2
4
5
N.C.
N.C.
Not connected
Not bonded internally
Not connected
Not bonded internally
6
7
GND
N.C.
Ground
Not connected
Not bonded internally
8
GND
Ground
9
CANH
CANL
GND
CAN high bus pin
CAN low bus pin
10
11
Ground
CAN common ground
12
13
14
15
16
TXDLIN1
RXDLIN1
TXDLIN2
RXDLIN2
N.U.
Transmit LIN1
Receive LIN1
Transmit LIN2
Receive LIN2
Not used
Used for internal testing purpose. Do not connect, leave open
17
18
19
N.U.
N.U.
N.U.
Not used
Used for internal testing purpose. Do not connect, leave open
Not used
Used for internal testing purpose. Do not connect, leave open
Not used
Used for internal testing purpose. Do not connect, leave open
20
21
22
23
VCAN
Supply input for internal HS-CAN module
Transmit CAN
TXDCAN
RXDCAN
VCC1
Receive CAN
Buck regulator
Input feedback for buck regulator
Datasheet
8
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Pin configuration
Table 1
Pin
Pin definitions and functions
Symbol
Function
24
RO
Reset output
Active LOW, internal pull-up
25
26
INT
Interrupt output
Active LOW output
GND
Ground
Buck regulator ground
27
28
BCKSW
VS
Buck regulator switch node output
Buck supply voltage
Connected to battery voltage or boost output voltage with reverse protection
diode. Use a filter for EMC in case the boost is not used
29
VS
Buck supply voltage
Connected to battery voltage or boost output voltage with reverse protection
diode. Use a filter for EMC in case the boost is not used
30
31
32
33
VSENSE
N.C.
Sense input voltage for boost
Boost regulator feedback input. Connect with VS
Not connected
Not bonded internally
SNSN
SNSP
Ground
Boost regulator ground
Boost transistor source
Source connection for external MOSFET, sense resistor connection. Connect to
GND if boost regulator is not used
34
35
BSTG
BSTD
Boost transistor gate
Gate connection for external MOSFET. Connect to GND or leave open if boost
regulator is not used
Boost transistor drain
Drain connection for external MOSFET. Connect to VS if boost regulator is not
used
36
37
WK
Wake input
CFG
Hardware initialization pin
External pull-up to VCC1 needed. Refer to Chapter 15
38
39
CSN
SDO
SPI Chip select not input
SPI Data output
Out of SBC (=MISO)
40
SDI
SPI Data input
Into SBC (=MOSI)
41
42
43
CLK
SPI Clock input
Ground
GND
VCC2
Voltage regulator output 2
Datasheet
9
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Pin configuration
Table 1
Pin
Pin definitions and functions
Symbol
Function
44
VS2
Supply voltage for VCC2
Connected to battery voltage with reverse protection diode and filter against
EMC.
45
VLIN
Reference voltage for LIN
Connected to battery voltage with reverse protection diode and filter
against EMC
46
47
FO1
Fail output 1
Active LOW, open drain
FO2/FSI
Fail output 2 - Side indicator
Side indicator 1.25 Hz 50% duty cycle output; active LOW, open drain
FSI
Fail-safe input (default configuration); connect to GND if not used
48
FO3/TEST
Fail output 3 - Pulsed lighted output
Break/rear light 100 Hz 20% duty cycle output; active LOW, open-drain
TEST
Connect to GND to activate SBC Development mode; integrated pull-up resistor.
Connect to VS with a pull-up resistor or leave open for normal operation
Exposed GND
pad
Connect the exposed pad to GND. It is recommended to connect the exposed pad
to a heat sink1)
1) The exposed die pad at the bottom of the package allows better power dissipation of heat from the SBC via the PCB.
The exposed die pad is not connected to any active part of the IC. However it should be connected to GND for the best
EMC performance.
Datasheet
10
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Pin configuration
3.3
Hints for unused pins
It must be ensured that the correct configurations are also selected, i.e. in case functions are not used that
they are disabled via SPI:
•
•
•
•
•
•
•
•
WK: connected to GND and disable the WK input via SPI
LINx, RXDLINx, TXDLINx, RXDCAN, TXDCAN, CANH, CANL: leave all pins open
BSTD: connect to VS in case the boost regulator is not used and keep disabled
BSTG: connect to GND or leave open in case the boost regulator is not used and keep disabled
SNSP, SNSN: connect to GND in case the boost regulator is not used
RO / FOx: leave open
INT: leave open
TEST: connect to GND during power-up to activate SBC Development mode; connect to VS or leave open
for normal user mode operation
•
•
•
•
VCC2: leave open and keep disabled
VCAN: connect to VCC1
N.C.: not connected, not bonded internally, leave open
Unused pins routed to an external connector which leaves the ECU should feature a zero ohm jumper
(depopulated if unused) or ESD protection
Datasheet
11
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
General product characteristics
4
General product characteristics
4.1
Absolute maximum ratings
Table 2
Absolute maximum ratings1)
Tj = -40°C to +150°C; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
Voltages
Supply voltage VS pin
Supply voltage VS2 pin
Supply voltage VS pin
VS, max
VS2, max
VS, max
-0.3
-0.3
-0.3
–
–
–
28
28
40
V
V
V
–
P_4.1.1
–
P_4.1.25
Loaddump, max. P_4.1.2
400 ms
Supply voltage VS2 pin
VS2, max
-0.3
–
40
V
Loaddump, max. P_4.1.26
400 ms
LIN supply voltage VLIN pin VLIN, max
-0.3
-0.3
–
–
40
28
V
V
–
–
P_4.1.12
P_4.1.19
Boost drain voltage
BSTD pin
VBSTD, max
Boost drain voltage
BSTD pin
VBSTD, max
-0.3
–
40
V
Loaddump, max. P_4.1.20
400 ms
Boost gate voltage BSTG pin VBSTG, max
-0.3
-0.3
-0.3
–
–
–
–
–
40
40
40
V
V
V
–
–
–
–
–
P_4.1.21
P_4.1.22
P_4.1.23
P_4.1.24
P_4.1.3
Supply voltage SNSP pin
Sense voltage VSENSE pin
Buck switch BCKSW pin
VSNSP, max
VSENSE, max
VBCKSW, max -0.3
VS + 0.3 V
Buck regulator feedback,
pin VCC1
VCC1, max
-0.3
5.5
V
Voltage regulator 2 output, VCC2, max
-0.3
–
40
V
–
P_4.1.5
pin VCC2
Wake input
VWK, max
VFOx, max
-0.3
-0.3
–
–
40
40
V
V
–
–
P_4.1.6
P_4.1.7
Fail pins FO1, FO2/FSI,
FO3/TEST
Configuration pin CFG
VCFG, max
-0.3
–
VCC1
V
–
P_4.1.8
+ 0.3
LINx, CANH, CANL
VBUS, max
VDIFF
-27
-5
–
–
–
40
10
V
V
V
–
–
–
P_4.1.9
V
diff = CANH - CANL
P_4.1.28
P_4.1.10
Logic input voltage
VI, max
-0.3
VCC1
+ 0.3
Datasheet
12
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
General product characteristics
Table 2
Absolute maximum ratings1) (cont’d)
Tj = -40°C to +150°C; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
–
Unit Note or
Test Condition
Number
Min.
Max.
Logic output voltage
VO, max
-0.3
VCC1
+ 0.3
V
–
P_4.1.27
P_4.1.11
VCAN Input voltage
Temperatures
VVCAN, max
-0.3
–
5.5
V
–
Junction temperature
Storage temperature
ESD susceptibility
ESD resistivity to GND
Tj
-40
-55
–
–
150
150
°C
°C
–
–
P_4.1.13
P_4.1.14
Tstg
VESD
VESD
-2
-8
–
–
2
8
kV
kV
HBM2)
HBM3)2)
P_4.1.15
P_4.1.16
ESD resistivity to GND,
CANH, CANL, LINx
ESD resistivity to GND
VESD
-500
–
–
500
750
V
V
CDM4)
CDM4)
P_4.1.17
P_4.1.18
ESD resistivity pin 1, 12, 13, VESD1,12,13,24, -750
24, 25, 36, 37, 48 (corner
25,36,37,48
pins) to GND
1) Not subject to production test, specified by design.
2) ESD susceptibility, “HBM” according to ANSI/ESDA/JEDEC JS-001 (1.5 kΩ, 100 pF).
3) For ESD GUN resistivity, tested at 6 kV (according to IEC61000-4-2 “gun test” (330 Ω, 150 pF)), it is shown in
application information and test report, provided from IBEE, is available.
4) ESD susceptibility, Charged Device Model “CDM” according to ANSI/ESDA/JEDEC JS-002.
Notes
1. Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2. Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
datasheet. Fault conditions are considered as “outside” normal operating range. Protection functions are not
designed for continuous repetitive operation.
Datasheet
13
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
General product characteristics
4.2
Functional range
Table 3
Functional range
Parameter
Symbol
Values
Typ.
–
Unit Note or
Test Condition
Number
Min.
Max.
1)
Supply voltage
VS,func
VPOR
28
V
V
see
P_4.2.1
POR
Chapter 13.9
LIN supply voltage (VLIN pin) VREF,LIN
5.5
4.75
10
–
–
–
–
18
5.25
22
4
V
P_4.2.2
P_4.2.3
P_4.2.6
P_4.2.4
CAN supply voltage
CFG external pull-up
SPI frequency
VCAN
RCFG
fSPI
V
–
–
kΩ
–
MHz see
Chapter 14.7 for
fSPI,max
Junction temperature
Tj
-40
–
150
°C
–
P_4.2.5
1) Including power-on reset, overvoltage and undervoltage protection.
Note: Within the functional range the IC operates as described in the circuit description. The electrical
characteristics are specified within the conditions given in the related electrical characteristics table.
Device behavior outside of specified functional range
•
28 V < VS,func < 40 V: Device will still be functional; the specified electrical characteristics may not be ensured
anymore. The buck and VCC2 will work, however, a thermal shutdown may occur due to high power
dissipation. The specified SPI communication speed is ensured. The absolute maximum ratings are not
violated, however the device is not intended for continuous operation of VS > 28 V. Operating the device at
high junction temperatures for prolonged periods of time may reduce the life of the device
•
•
•
•
•
18 V < VLIN < 28 V: The LIN transceiver is still functional. However, the communication may fail due to out-
of-LIN-spec operation
V
LIN,UVD < VLIN < 5.5 V: The LIN transceiver is still functional. However, the communication may fail due to
out-of-LIN-spec operation
CAN < 4.75 V: The undervoltage bit VCAN_UV will be set in the SPI register BUS_STAT_1 and the transmitter
V
will be disabled as long as the UV condition is present
5.25 V < VCAN < 5.50 V: CAN transceiver still functional. However, the communication may fail due to out-of-
spec operation
VPOR,f < VS < 5.5 V: Device will be still functional; the specified electrical characteristics may not be ensured
anymore:
–
–
–
–
–
The voltage regulators will enter the low-drop operation mode
A VCC1_UV reset could be triggered depending on the Vrtx settings
The LIN transmitter will be disabled if VLIN < VLIN,UVD is reached and VLIN_UV bit on SUP_STAT is set
FOx outputs will remain ON if they were enabled
The specified SPI communication speed is ensured
Datasheet
14
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
General product characteristics
4.3
Thermal resistance
Table 4
Thermal resistance1)
Symbol
Parameter
Values
Typ.
6
Unit Note or
Test Condition
Number
Min.
Max.
Junction to soldering point RthJSP
Junction to ambient RthJA
–
–
–
–
K/W Exposed Pad
P_4.3.1
P_4.3.2
2)
33
K/W
1) Not subject to production test, specified by design.
2) According to Jedec JESD51-2,-5,-7 at natural convection on FR4 2s2p board for 1.5 W. Board: 76.2 x 114.3 x 1.5 mm3
with 2 inner copper layers (35 µm thick), with a thermal via array under the exposed pad contacting the first inner
copper layer and 300 mm2 cooling area on the bottom layer (70 µm). For more details, refer to Chapter 15.4.
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General product characteristics
4.4
Current consumption
Table 5
Current consumption
Current consumption values are specified at Tj = 25°C, VS = 13.5 V, all outputs open
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or Test Condition Number
Min.
Max.
SBC Normal mode
Normal mode current
consumption
INormal
–
5
10
mA
µA
5.5 V < VS < 28 V
no load on VCC1
Tj = -40°C to +150°C
VCC2 / CAN / LIN / BOOST
= OFF
P_4.4.1
P_4.4.2
SBC Stop mode
Stop mode current
consumption
IStop,25
–
–
–
50
65
1)2) Tj = 25°C
Buck module in PFM
no load on VCC1
VCC2 = OFF;
CAN / LINx = OFF
Watchdog = OFF
WK enabled
BOOST = OFF
1)2)3) Tj = 85°C;
Stop mode current
consumption
IStop,85
95
70
–
µA
µA
P_4.4.3
P_4.4.4
Buck module in PFM
no load on VCC1
VCC2 = OFF;
CAN / LINx = OFF
Watchdog = OFF
WK enabled
BOOST = OFF
1)2) Tj = 25°C
Buck module in PFM
no load on VCC1
VS2 = VS
Stop mode current
consumption,
VCC2 enabled
IStop,VCC2,25
95
VCC2 = ON (no load); CAN
/ LINx = OFF
Watchdog = OFF
WK enabled
BOOST = OFF
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OPTIREG™ SBC TLE9271QX
General product characteristics
Table 5
Current consumption (cont’d)
Current consumption values are specified at Tj = 25°C, VS = 13.5 V, all outputs open
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
65
Unit Note or Test Condition Number
Min.
Max.
Stop mode current
consumption,
cyclic wake
IStop,C25
–
85
µA
1)2) Tj = 25°C
P_4.4.5
Buck module in PFM
no load on VCC1
VCC2 = OFF;
CAN / LINx = OFF
Watchdog = ON
WK enabled
BOOST = OFF
SBC Sleep mode
Sleep mode current
consumption
ISleep,25
–
–
–
30
80
50
50
–
µA
µA
µA
1) Tj = 25°C
VCC1,VCC2 = OFF
CAN / LINx = OFF,
WK enabled
1)3) Tj = 85°C
VCC1,VCC2 = OFF
CAN / LINx = OFF
WK enabled
P_4.4.6
P_4.4.13
P_4.4.7
Sleep mode current
consumption
ISleep,85
Sleep mode current
consumption,
ISleep,VCC2,25
75
1) Tj = 25°C
VCC1= OFF
VCC2 enabled
VS2 = VS
VCC2 = ON (no load)
CAN / LINx = OFF
WK enabled
Incremental current consumption
Current consumption for ICAN,rec
CAN, recessive state
–
–
–
2
3
1
3
mA
mA
mA
VCAN = VCC2
P_4.4.8
P_4.4.14
P_4.4.9
SBC Normal mode
CAN Normal mode
VTXDCAN = 5 V
no RL on CAN
Current consumption for ICAN,dom
CAN, dominant state
4.5
2
3)VCAN = 5V
SBC Normal mode
CAN Normal mode
VTXDCAN = GND
no RL on CAN
1) VCAN = VCC2
SBC Normal / Stop mode
CAN Receive-Only mode
VTXDCAN = 5 V
Current consumption for ICAN,RevOnly
CAN module,
Receive-Only mode
no RL on CAN
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OPTIREG™ SBC TLE9271QX
General product characteristics
Table 5
Current consumption (cont’d)
Current consumption values are specified at Tj = 25°C, VS = 13.5 V, all outputs open
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
4.5
Unit Note or Test Condition Number
Min.
Max.
Current consumption for ICAN,wake
CAN module wake
–
6
µA
1) SBC Stop/Sleep/Fail- P_4.4.10
Safe mode;
capability
CAN wake capable;
LIN1…4 = OFF
Current consumption
per LIN module,
recessive state
ILIN,rec
–
–
–
0.1
1.0
0.1
1.0
1.5
0.2
mA
mA
mA
SBC Normal mode
LIN Normal mode;
VTXDLIN = VCC1;
no RL on LIN
3)SBC Normal mode
LIN Normal mode;
VTXDLIN = GND;
no RL on LIN
P_4.4.15
P_4.4.16
P_4.4.17
Current consumption
per LIN module,
dominant state
ILIN,dom
Current consumption
per LIN module,
ILIN,RcVOnly
3)SBC Normal / Stop
mode
Receive-Only mode
LIN Receive-Only mode;
VTXDLIN = VCC1; no RL
on LIN
Current consumption
per LIN module wake
capability
ILIN,wake
IWK,wake
IBOOST,ON
–
–
–
0.2
0.2
5
2
µA
µA
mA
1)SBC Stop/Sleep/Fail-
Safe mode;
CAN wake capable; LIN
wake capable
P_4.4.11
P_4.4.12
P_4.4.18
WK pin current
consumption wake
capable
2
SBC Normal/Stop/
Sleep/Fail-Safe mode;
WK wake capable;
LIN1…4, CAN = OFF
3) SBC Normal/Stop
mode
Additional VS current
consumption with boost
module active
10
VBSTx < VS < VBST,thx
BOOST = ON
1) Current consumption for CAN,LIN transceivers and WK input to be added if set to be wake capable or receiver only.
2) If the buck regulator is working in PWM, the P_4.4.1 has to be added.
3) Specified by design; not subject to production test.
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OPTIREG™ SBC TLE9271QX
System features
5
System features
This chapter describes the system features and behavior of the TLE9271QX:
•
•
•
•
•
State machine and SBC mode control
Device configurations
State of supply and peripherals
Wake features
Supervision and diagnosis functions
The System Basis Chip (SBC) offers six operating modes:
•
•
•
•
•
SBC Init mode: power-up of the device and after soft reset
SBC Normal mode: the main operating mode of the device
SBC Stop mode: the first-level power saving mode with the main voltage regulator VCC1 enabled
SBC Sleep mode: the second-level power saving mode with VCC1 disable
SBC Restart mode: an intermediate mode after a wake event from SBC Sleep or SBC Fail-Safe mode or after
a failure (e.g. WD failure, VCC1 undervoltage reset) to bring the microcontroller into a defined state via a
reset. Once the failure condition is not present anymore, the device will automatically change to SBC
Normal mode after a delay time (tRD1
)
•
SBC Fail-Safe mode: a safe-state mode after critical failures (e.g. TSD2 thermal shutdown, VCC1 short to
GND) to bring the system into a safe state and to ensure a proper restart of the system. VCC1 is disabled.
This is a permanent state until either a wake event (via CAN, LINx or WK pin) occurs and the
overtemperature condition is not present anymore
A special mode called SBC Development mode is available during software development or debugging of the
system. All of the operating modes mentioned above can be accessed in this mode. However, the watchdog
counter is stopped and does not need to be triggered. This mode can be accessed by setting the TEST pin to
GND during SBC Init mode.
The System Basis Chip is controlled via a 16-bit SPI interface. A detailed description can be found in
Chapter 14. The configuration as well as the diagnosis is handled via the SPI. The SPI mapping of the high-end
SBC family TLE927xQX is compatible with the latest Infineon SBC devices.
5.1
State machine description and SBC mode control
The different SBC modes are selected via SPI by setting the respective SBC MODE bits in the register
M_S_CTRL. The SBC MODE bits are cleared when going trough SBC Restart mode, so the current SBC mode is
always shown.
The Figure 3 shows the SBC state diagram.
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System features
First battery connection
SBC Soft Reset
SBC Init Mode *
(Long open window)
VCC1
ON
VCC2
OFF
Boost
OFF
WD
config.
* The SBC Development Mode
is a super set of state machine
where the WD timer is stopped.
Otherwise, there are no
Any SPI
command
Cyc.Wake
OFF
FO
inact.
CAN
OFF
LINx
OFF
differences in behavior.
SBC Normal Mode
VCC1
VCC2
1) Boost
WD
WD trig
ON
OFF/ON conf./OFF config.
Cyc.Wake
config.
FO
CAN
LINx
config.
act./Inact. config.
SPI cmd
SPI cmd
SPI cmd
.
.
Reset is released
WD starts with long open window
Automatic
SBC Stop Mode
1) Boost
SBC Sleep Mode
VCC1
ON
VCC2
WD
VCC1
OFF
VCC2
OFF/ON
Boost
OFF
WD
OFF
VCC1 over voltage
(if VCC1_OV_RST set)
OFF/ON fixed/OFF fixed/OFF
4) CAN
Wake
LINx
Wake
Cyc.Wake
fixed
FO
act./Inact.
CAN
fixed
LINx
fixed
Cyc.Wake
OFF
FO
act./Inact.
cap./OFF cap./OFF
CAN, WK, LIN1..4 wake-up
event
SBC Restart Mode
(RO pin is asserted)
WD Failure
(Config 1/3)
VCC1
ON/
ramping
VCC2
OFF
2) CAN
woken/
OFF
1) Boost
fixed/OFF
2) LINx
woken/
OFF
WD
OFF
VCC1
Undervoltage
Cyc.Wake
OFF
FO
act./Inact.
SBC Fail-Safe Mode
TSD2 event
VCC1
OFF
VCC2
OFF
Boost
OFF
WD
OFF
VCC1 Short
to GND
CAN, WK, LINx wake-up event
CAN
wake
capable
LINx
wake
capable
Cyc.Wake
OFF
FO
active
1) The Boost regulator activation depends from the VS value.
2) See chapter CAN and LIN for detailed behaviour in SBC Restart Mode
3) See Chapter 5.1.5 and 12.1 for detailed FOx behavior
4) Must be set to CAN wake capable / CAN OFF mode before entering SBC sleep mode
Figure 3
State diagram showing the SBC operating modes
5.1.1
SBC Init mode and device configuration
The SBC Init mode is the mode where the hardware configuration of the SBC is stored and where the
microcontroller finishes the initialization phase. During the SBC Init mode, the SBC can be configured in
normal operation or in SBC Development mode (see also Chapter 5.1.7).
The hardware configuration is done monitoring the level of FO3/TEST pin. The pin FO3/Test is set as an input
and one internal pull-up resistor is activated (RTEST). The Table 6 shows possible hardware configurations.
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OPTIREG™ SBC TLE9271QX
System features
Table 6
SBC configuration
Configuration Description
FO3/Test pin TEST
CFG2_ STATE
Config 0
SBC Development mode: no reset is triggered 0
1
X
in case of a watchdog trigger failure. After the
power-up, one arbitrary SPI command must
be sent
Config 1
Config 3
After missing the WD trigger for the first time, Open or
the state of VCC1 remains unchanged, FOx pins > VTEST,H
are active, SBC Restart mode
0
0
1
0
After missing the WD trigger for the second
time, the state of VCC1 remains unchanged,
FOx pins are active, SBC Restart mode
Open or
> VTEST,H
An external pull-up resistor on CFG pin (RCFG) is needed for proper SBC configuration. The config 1 or 3 is
selectable via SPI using CFG2 bit on HW_CTRL register.
The timing diagram for hardware configuration is shown in Figure 4.
The SBC starts up in SBC Init mode after crossing the VPOR,r threshold (see also Chapter 13.3) or after a
software reset command. As soon as the VCC1 voltage reaches the rising reset threshold VRT1,r, the
configuration selection monitoring period starts for tRD1 (Reset delay time). After this time, the reset pin is
released and the window watchdog starts with a long open window tLW
.
VS
VPOR,r
t
t
VCC1
VRT1,r
RO
t
tRD1
Configuration selection monitoring period
Figure 4
Hardware configuration selection timing diagram
During the long open window, the microcontroller needs to finish its startup and initialization sequence. From
this transition mode, the SBC can be set, via SPI command, to SBC Normal mode.
Any SPI command will bring the SBC to SBC Normal mode even if it is an illegal SPI command (Chapter 14.2).
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System features
No watchdog trigger during the long open window, will cause a watchdog failure and the device will enter in
SBC Restart mode as shown in Table 6 and one reset event is generated.
In case of 3 consecutive reset events due to WD failures, it is possible not to generate additional reset by
setting the MAX_3_RST on WD_CTRL and the SBC will remain in SBC Normal or Stop mode (SBC Restart mode
not entered anymore). If the MAX_3_RST is set to 0, one reset event is generated for each missing watchdog
trigger.
Wake-up events are ignored during SBC Init mode and will therefore be lost.
Notes
1. Any SPI command will bring the SBC to SBC Normal mode even if it is an illegal SPI command
(see Chapter 14.2).
2. For a safe start-up, it is recommended to use the first SPI commands to trigger and to configure the
watchdog.
3. At power up no VCC1_UV will be issued nor will the FOx be triggered as long as VCC1 is below VRT1,r threshold
and below the VS threshold for VS under voltage time out VS,UV_TO. The RO pin will be kept low as long as VCC1
is below the selected VRT1,r threshold. When VCC1 is above the VRT1,r threshold, the RO is released after tRD1
(Reset delay time).
5.1.2
SBC Normal mode
The SBC Normal mode is the standard operating mode for the SBC. All configurations have to be done in
SBC Normal mode before entering a low-power mode. A wake-up event on CAN, LIN1, LIN2 and WK will create
an interrupt on pin INT however, no changes of SBC mode will occur. The configuration options are listed
below:
•
•
VCC1 is active (buck regulator in PWM mode)
Boost regulator can be configured and enabled or disabled. The module will start to work as soon as the
VS value is dropping below the selected threshold. For additional information, refer to Chapter 6.3
•
•
VCC2 can be switched ON or OFF (default off)
CAN is configurable (OFF coming from SBC Init mode; OFF or wake capable coming from SBC Restart mode,
see also Chapter 5.1.5)
•
LIN is configurable (OFF coming from SBC Init mode; OFF or wake capable coming from SBC Restart mode,
see also Chapter 5.1.5)
•
•
•
•
Wake pin shows the input level and can be selected to be wake capable
Cyclic wake can be configured with timer1
Watchdog is configurable
FO1 and FO3 are OFF and FSI is active by default. FSI can be configured to be fail-safe output (see also
Chapter 12.2). Coming from SBC Restart mode, the FOx can be active or inactive (see also Chapter 12.1)
In SBC Normal mode, there is the possibility of testing the FO outputs, i.e. to verify if setting the FOx pins to
low will create the intended behavior within the system. The FO outputs can be enabled and then disabled
again by the microcontroller by setting the FO_ON SPI bit. The feature is only intended for testing purposes.
5.1.3
SBC Stop mode
The SBC Stop mode is the first level technique to reduce the overall current consumption. In this mode
VCC1 regulator is still active and supplying the microcontroller, which can enter into a power down mode.
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System features
The VCC2 could be enabled or disabled, CAN and LIN can be configured as Receive-Only mode, or wake
capable or disable. All kind of settings have to be done before entering SBC Stop mode. In SBC Stop mode any
kind of SPI WRITE commands are ignored and the SPI_FAIL bit is set, except for changing to SBC Normal
mode, triggering a SBC soft reset, refreshing the watchdog, write the SYS_STAT_CTRL register as well as
reading and clearing the SPI status registers. A wake-up event on CAN, LIN1, LIN2 and WK will create an
interrupt on pin INT - however, no change of SBC mode will occur. The configuration options are listed below:
•
•
VCC1 is ON (buck regulator in PFM mode)
Boost regulator is fixed as configured in SBC Normal mode. The module will start to work as soon as the
VS value drops below the selected threshold
•
•
•
•
•
VCC2 is fixed as configured in SBC Normal mode
CAN is fixed as configured in SBC Normal mode
LIN is fixed as configured in SBC Normal mode
WK is fixed as configured in SBC Normal mode
Cyclic wake is fixed as configured in SBC Normal mode
Note: It is not possible to switch directly from SBC Stop mode to SBC Sleep mode. Doing so will also set the
SPI_FAIL flag and will bring the SBC into Restart mode.
5.1.4
SBC Sleep mode
The SBC Sleep mode is the second level technique to reduce the overall current consumption to a minimum
needed to react on wake-up events. In this mode, VCC1 regulator is OFF and not supplying the microcontroller
anymore.The VCC2 supply can be configured to stay enabled. A wake-up event on CAN, LIN1, LIN2 or WK pin
return the device to SBC Normal mode via SBC Restart mode and signal the wake source.
The configuration options are listed below:
•
•
•
•
•
•
VCC1 is OFF
Boost regulator is OFF
VCC2 is fixed as configured in SBC Normal mode
Can must be set to CAN wake capable / CAN off before entering SBC Sleep mode
LIN is fixed as configured in SBC Normal mode
WK is fixed as configured in SBC Normal mode
It is not possible to switch off all wake sources in SBC Sleep mode. When a CAN or LIN transceiver is in its
Normal or Receive-Only mode, it counts as a wake source. In that case it changes automatically to wake
capable when the SBC enters SBC Sleep mode.
All settings must be made before entering SBC Sleep mode. If SPI configurations were sent to the SBC in
SBC Sleep mode, the commands are ignored and there is no response from the SBC.
In order to enter SBC Sleep mode successfully, all wake source signaling flags from WK_STAT_1 and
WK_STAT_2 need to be cleared. Otherwise, the device will immediately wake-up from SBC Sleep mode by
going via SBC Restart to Normal mode.
Note: As soon as the sleep command is sent, the reset will go low to avoid any undefined behavior between SBC
and microcontroller.
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System features
5.1.5
SBC Restart mode
There are multiple reasons to enter the SBC Restart mode. The purpose of the SBC Restart mode is to reset the
microcontroller:
•
From SBC Normal and Stop mode:
–
–
–
Undervoltage on VCC1
Overvoltage on VCC1 (if VCC1_OV_ RST is set)
Incorrect Watchdog triggering
•
From SBC Sleep and Fail-Safe mode:
–
–
Wake-up event on CAN or LINx or WK
After TDS2 (only from SBC Fail-Safe mode. See also Chapter 13.8)
Table 7 contains detailed descriptions of the reason to restart.
Table 7
Reasons for restart - state of SPI status bits after return to Normal mode
Event DEV_STAT WD_FAIL VCC1_UV VCC1_OV VCC1_SC
SBC mode
Normal mode Watchdog failure
01
01
01
10
01
01
01
01
01 or 10
0
1
0
0
0
1
0
x
0
1
x
x
0
1
x
x
x
x
x
x
x
Normal mode VCC1 undervoltage reset
Normal mode VCC1 overvoltage reset
xx
xx
Sleep mode
Stop mode
Stop mode
Stop mode
Wake-up event
00
Watchdog failure
01 or 10
VCC1 undervoltage reset
VCC1 overvoltage reset
xx
xx
Fail-Safe mode Wake-up event
see “Reasons for Fail-safe, Table 8”
It is possible to change the entering into SBC Restart mode due to watchdog trigger failure using MAX_3_RST
on WD_CTRL register. If the MAX_3_RST is set, after three consecutive resets, no further reset events are
generated in case of missing watchdog trigger (see also Chapter 13.2).
From SBC Restart mode, the SBC automatically enters to SBC Normal mode, i.e. the mode is left automatically
by the SBC without any microcontroller influence once the reset condition is no longer present and when the
reset delay time (tRD1) has expired. The Reset output (RO) is released at the transition.
Entering or leaving SBC Restart mode will not disable the fail outputs.
The following functions are activated / deactivated in SBC Restart mode:
•
•
VCC1 is ON or ramping up
Boost regulator is fixed as configured in SBC Normal mode. The module will start to work as soon as the
VS value drops below the selected threshold
•
•
VCC2 will be disabled if it was activated
CAN is “woken” due to a wake-up event or OFF depending on previous SBC and transceiver mode (see also
Chapter 8). It is wake capable when it was in CAN Normal, Receive-Only or wake capable mode before
SBC Restart mode
•
LINx are “woken” due to a wake-up event or OFF depending on previous SBC and transceiver mode (see
also Chapter 9). It is wake capable when it was in LINx Normal, Receive-Only or wake capable mode before
SBC Restart mode
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System features
•
•
•
RO is pulled low during SBC Restart mode
SPI communication is ignored by the SBC, i.e. it is not interpreted
SBC Restart mode is signalled in the SPI register DEV_STAT by DEV_STAT bits
Note: The VCC1 overvoltage reset is by default disabled. To enable it, the VCC1_OV_ RST has to be set. For
additional information, refer to Chapter 13.5.2.
5.1.6
SBC Fail-Safe mode
The purpose of this mode is to bring the system in a safe status after a failure condition by turning off the
VCC1 regulator and the RO will be LOW. After a wake-up event, the system can restart.
The Fail-Safe mode is automatically reached in case of following events:
•
•
Overtemperature (TSD2) (see also Chapter 13.8)
VCC1 is shorted to GND (see also Chapter 13.5.3)
In this case, the default wake sources are activated and the voltage regulators are switched OFF.
The mode will be maintained for at least typical 1s (tTSD2) for a TSD2 event and typical 100 ms (tFS,min) for the
other failure events to avoid any fast toggling behavior. All wake sources will be disabled during this time but
wake-up events will be stored. Stored wake-up events and wake-up events after this minimum waiting time
will lead to SBC Restart mode. Leaving the SBC Fail-Safe mode will not result in deactivation of the FOx pins.
The following functions are influenced during SBC Fail-Safe mode:
•
•
•
•
•
•
•
•
•
FO outputs are activated (see also Chapter 12)
VCC1 is OFF
Boost regulator is OFF
VCC2 is OFF
CAN is wake capable
LINx are wake capable
WK is wake capable
Cyclic wake is disabled, static sense is active with default filter time
SPI communication is disabled because VCC1 is OFF
Table 8
Mode
Reasons for fail-safe - state of SPI status bits after return to Normal mode
Config Event
1, 3 TSD2
1, 3, 4 VCC1 short to GND
DEV_STAT TSD2
WD_FAIL
VCC1_UV
VCC1_SC
Normal
Normal
01
01
01
01
1
x
1
x
xx
xx
xx
xx
x
1
x
1
0
1
0
1
Stop mode 1, 3
Stop mode 1, 3
TSD2
VCC1 short to GND
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System features
5.1.7
SBC Development mode
The SBC Development mode is used during development phase of the application, especially for software
development. The mode is reached by setting the FO3/TEST pin to LOW when the device is in SBC Init mode
and by sending an arbitrary SPI command. The SBC Init mode is reached after the power-up.
When sending a software reset, it is no longer possible to enter SBC Development mode.
The software reset is the SPI command that set the MODE bits in M_S_CTRL register.
SBC Development mode can only be left by a power-down while FO3/TEST pin is high or open, or by setting
the MODE bits on M_S_CTRL SBC Software Reset regardless of the state of FO3/TEST.
In this mode, the watchdog does not need to be triggered. No reset is triggered because of watchdog failure.
When the FO3/TEST pin is left open, or connected to VS during the start-up, the SBC starts into normal
operation. The FO3 pin has an integrated pull-up resistor, RTEST, (switched ON only during SBC Init mode) to
prevent the SBC device from starting in SBC Development mode during normal life of the vehicle.
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System features
5.2
Wake features
The following wake sources are implemented in the device:
•
•
•
•
Static Sense: WK input is permanently active (see Chapter 10)
Cyclic Wake: internal wake source controlled via internal timer (see Chapter 5.2.1)
CAN wake: wake-up via CAN pattern (see Chapter 8)
LIN wake: wake-up via LIN bus (see Chapter 9)
The wake source must be set before entering in SBC Sleep mode. In case of critical situation when the device
will be set into SBC Fail-Safe mode, all default wake sources will be activated.
5.2.1
Cyclic wake
The cyclic wake feature is intended to reduce the quiescent current of the device and application.
For the cyclic wake feature, timer 1 is configured as internal wake-up source and will periodically trigger an
interrupt in SBC Normal and Stop mode based on the setting of TIMER1_CTRL.
The correct sequence to configure the cyclic wake is shown in Figure 5.
The sequence is as follows:
•
•
Configure the respective period of timer1 in the register TIMER1_CTRL
Enable timer1 as a wake-up source in the register WK_CTRL_1
Cyclic Wake Configuration
Periods: 10, 20, 50, 100, 200ms, 1s, 2s
Select Timer Period in TIMER1_CTRL
Select Timer1 as a wake source in
No interrupt will be generated,
if the timer is not enabled as a wake source
WK_CTRL_1
Cyclic Wake starts automatically
INT is pulled low at the end of every
period
Figure 5
Cyclic wake: configuration and sequence
The cyclic wake function will start as soon as the timer1 is enabled as wake-up source. An interrupt is
generated at the end of every period.
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System features
5.2.2
Internal timer
The integrated timer is typically used to wake up the microcontroller periodically (cyclic wake).
The following periods can be selected via the register TIMER1_CTRL:
•
Period: 10 ms / 20 ms / 50 ms / 100 ms / 200 ms / 1 s / 2 s
5.3
Supervision features
The device offers various supervision features to support functional safety requirements. Refer to Chapter 13
for more information.
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DC/DC regulators
6
DC/DC regulators
6.1
Block description
The SMPS module in the TLE9271QX is implemented as a cascade of a step-up pre-regulator followed by a
step-down post-regulator. The step-up pre-regulator (DC/DC boost converter) provides a VS level which
permits the step-down post-regulator (DC/DC buck converter) to regulate without entering a low-drop
condition.
The SMPS module is active in SBC Normal, Stop and Restart mode. In SBC Sleep and Fail-Safe mode, the SMPS
module is disabled.
Comparator
VSENSE
D1
L1
D2
Vbat
SPI
VSUP
VS
Boost
Converter
C1
C2
C3
BSTD
BSTG
T1
SNSP
SNSN
Rsense
Feedforward
Buck
Converter
L2
BCKSW
C4
C5
GND
Bandgap
Reference
VCC1
Soft Start
Ramp
Generator
Figure 6
DC/DC block diagram
Functional features
•
•
5 V SMPS (DC/DC) buck converter with integrated high-side and low-side power switching transistor
SMPS (DC/DC) boost converter as pre-regulator for low VSUP supply voltage (down to 3 V) with
configurable output voltage via SPI
•
•
Fixed switching frequency for buck and boost converter in SBC Normal mode in PWM (Pulse Width
Modulation)
PFM (Pulse Frequency Modulation) for buck converter in SBC Stop mode to reduce the quiescent current
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DC/DC regulators
•
•
•
•
•
•
•
Automatic transition PFM to PWM in SBC Stop mode
Soft start-up
Edge shaping for better EMC performances for buck and boost regulator
Undervoltage monitoring on VCC1 with adjustable reset level (refer to Chapter 13.5.1)
Overvoltage detection on VCC1 (refer to Chapter 13.5.2)
Buck short circuit detection
Boost current peak detection with external shunt resistor
6.2
Functional description buck converter
SPI
Logic
L1
VS
D1
Vbat
VSUP
Feedforward
C1
C2
C3
Buck
Converter
L2
BCKSW
C4
C5
GND
Bandgap
Reference
VCC1
Soft Start
Ramp
Generator
Figure 7
Buck block diagram
The DC/DC buck converter is intended as post-regulator (VCC1) and it provides a step down converter function
transferring energy from VS to a lower output voltage with high efficiency (typically more than 80%). The
output voltage is 5 V in a current range up to 750 mA. It is regulated via a digital loop with a precision of ±2%.
It requires an external inductor and capacitor filter on the output switching pin (BCKSW). The buck regulator
has two integrated power switches. The compensation of the regulation loop is done internally and no
additonal external components are needed.
A typical application example and external components proposal is available in Chapter 15.
The buck converter is active in SBC Normal, Stop and Restart mode and it is disabled in SBC Sleep and Fail-
Safe mode.
Depending on the SBC mode, the buck converter works in two different modes:
•
PWM mode (Pulse Width Modulation): This mode is available in SBC Normal mode, SBC Restart mode and
SBC Stop mode (only for automatic or manual PFM to PWM transitions. Please refer to Chapter 6.4.2).
In PWM, the buck converter operates with a fix switching frequency (fBCK). The duty cycle is calculated
internally based on input voltage, output voltage and output current. The precision is ±2% or ±3% based
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DC/DC regulators
on input supply and output current range (refer to Figure 13 for more information). In PWM mode, the
buck converter is capable of a 100% duty cycle in case of low VS conditions. In order to reduce EMC, edge
shaping feature has been implemented to control the activation and deactivation of the two power
switches
•
PFM mode (Pulse Frequency Modulation): This mode is activated automatically when the SBC Stop mode
is entered. The PFM mode is an asynchronous mode. PFM mode does not have a controller switching
frequency. The switching frequency depends on conditions of the buck regulator such as the following:
input supply voltage, output voltage, output current and external components. A typical timing diagram is
shown in Figure 8. The buck converter in PFM mode has a tolerance of ±4%. The transition from PFM mode
to PWM mode is described in Chapter 6.4.2
Tristate
HS
LS
Tristate
Feedback Voltage VCC 1
LVL
UCL
LCL
Coil Current
start biasing
&
oscillator
OFF
ON
OFF
ON
PFM active
Iq
Iq
Quiescent Current
Figure 8
Typical PFM timing diagram
6.2.1
Startup procedure (soft start)
The startup procedure (soft start) permits to achieve the buck regulator output voltage avoiding large
overshoot on the output voltage. This feature is activated during the power-up, from SBC Sleep to Restart
mode and from SBC Fail-Safe to SBC Restart mode.
When the buck regulator is activated, it starts with a minimum duty cycle and the regulation loop maintains it
for a limited number of switching periods. After this first phase, the duty cycle is increased by a fixed value and
kept for a limited number of switching periods. This procedure is repeated until the target output voltage
value of the buck regulator is reached. As soon as the buck regulator output voltage is reached, the regulation
loop starts to operate normally using PWM mode adjusting the duty cycle according the buck input and output
voltages and the buck regulator output current.
6.2.2
Buck regulator status register
The register SMPS_STAT contains information about the open or short conditions on BCKSW pin and if the
buck regulator is outside the 12% nominal output voltage range. No SBC mode or configuration is triggered if
one bit is set in the SMPS_STAT register.
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DC/DC regulators
6.2.3
External components
The buck converter needs one inductor and output capacitor filter. The inductor has a fixed value of 47 µH.
Secondary parameter such as saturation current must be selected based on the maximum current capability
needed in the application.
The output capacitors filter are 47 µF (typically, an electrolytic capacitor) in parallel with 10 µF (ceramic
capacitor). This configuration is intended for buck regulator functionality and keeps the total ESR lower than
1 Ω in all temperature range. For additional information, refer to Chapter 15.1.
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DC/DC regulators
6.3
Functional description boost
Comparator
VSENSE
VS
D1
L1
D2
Vbat
VSUP
SPI
Boost
Converter
C1
C2
C3
BSTD
BSTG
T1
SNSP
SNSN
Rsense
VS
Figure 9
Boost block diagram
The boost converter is intended as pre-regulator and it provides a step up converter function. It transfers
energy from an input supply VSUP (battery voltage after the reverse protection circuit) to a higher output
voltage (VS) with high efficiency (typically more than 80%).
The regulator integrates the gate driver for external power switching and external passive components are
necessary in particular: input buffer capacitor on the battery voltage, inductor, power switching transistor,
sense resistor for overcurrent detection, freewheeling diode and filter capacitor. A typical application
example is available in Chapter 15.
In SBC Normal mode and in SBC Stop mode, the boost regulator can be enabled via SPI (register HW_CTRL,
bit BOOST_EN). The boost output voltage has to be selected using BOOST_V bit. The BOOST_V on HW_CTRL
permits to select the minimum VBST1_1 or the output voltage VBST2_1
.
The activation thresholds vary according to the output voltage selected. Table 9 shows the possible activation
thresholds and the hysteresis including the respective SPI setting.
Table 9
Boost activation thresholds
Boost output voltage Activation threshold Hysteresis
SPI setting
VBST1_1
VBST2_1
VBST,TH1
VBST,TH2
VBST,HYS1
VBST,HYS2
BOOST_V = 1
BOOST_V = 0
If the boost regulator is enabled, it switches ON automatically when VSENSE falls below the threshold voltage
BST,TH1 or VBST,TH2 and switches OFF when crossing the threshold plus respective hysteresis. The bit BST_ACT
V
is set and can be cleared only if VSENSE is above the VBST,TH1 or VBST,TH2
.
Figure 10 shows the typical timing for enabling the boost converter.
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DC/DC regulators
VSUP
VS
VBST,THx
VBST,HYSx
0
1
0
BST_ACT
BSTG
Figure 10 Boost converter activation
The boost regulator works in PWM mode with a fixed frequency (fBST) and a tolerance of ±5%.
If the boost is enabled in SBC Stop mode, the SBC quiescent current is increased.
6.3.1
Boost regulator status register
The register SMPS_STAT contains information about the open or short conditions on boost pin’s including
loss of GND detection. No SBC mode or configuration is triggered if one bit is set on SMPS_STAT register.
6.3.2
External components
The boost converter requires a number of external components such as the following: input buffer capacitor
on the battery voltage, inductor, power switching transistor, sense resistor for overcurrent detection,
freewheeling diode and filter capacitors.
For recommend devices and values, refer to Chapter 15.1.
The recommended inductor value is 22 µH. The secondary parameters (e.g. saturation current) have to be
selected according to the maximum current capability required by the application.
The characterization is performed with the suggested external power MOSFET Infineon BSS606N. Other
MOSFETs can be used. However, the functionality has to be checked in the application considering the gate
driver current capability (Chapter 6.3.3 and Chapter 6.3.4) and maximum output current requirements.
6.3.2.1 Peak overcurrent detection
The boost converter implement one peak overcurrent detection using one external shunt resistor. For typical
application, refer to Chapter 15.1.
As soon as the boost converter detects one peak overcurrent, the regulation loop reduces the duty cycle in
order to reduce the peak current on the external MOSFET.
The shunt resistor can be calculated based on VTH,SNS and using Equation (6.1).
VTH ,SNS
(6.1)
RSENSE
=
IOC , peak
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DC/DC regulators
Example: for an overcurrent peak detection of 2.1 A, the resistor is typically 0.1 Ω.
6.3.3
Boost switch gate driver
The gate driver for the external boost switch is implemented with several phases with different characteristics.
Charging: Phases PH1 and PH2 uses a current source to charge the gate in a controlled way. The following
phases PH3 and PH4 involve a pull up resistor to an internal 5 V supply to bring the gate voltage to the final
value and keep it there during the whole ON-phase of the PWM cycle.
Discharging: Phases PH5 and PH6 uses current sources to discharge the gate in a controlled way. The following
phases PH7 and PH0 involve a pull down resistor to GND.
The current sources are optimized for operation with the MOSFET BSS606N.
Due to the phases which involve the pull up/down resistors it is possible to use also MOSFETs with higher gate
charge compared to BSS606N. The MOSFET selection is limited by the short circuit detection feature
described in Chapter 6.3.4.
PWM
Phase
PH0 PH1 PH2 PH3
Current source
PH4
PH5 PH6 PH7 PH0
Operation type
Pull up
Current source
Pull down
Gate voltage
blanked
active
blanked
Short to GND
blanked
active
Short to supply
t
Figure 11 Phases of the boost switch gate driver
6.3.4
BSTG short circuit detection
If the gate driver is not able to charge / discharge the gate connected to pin BSTG within a certain time, a short
at this pin is assumed and the driver is switched off for the current PWM cycle to protect the chip from damage.
For detecting short to GND (during PWM on) or short to supply (during PWM off) the following voltage
threshold is used:
•
•
Criteria for short to GND during PH4: VBSTG < VBSTG,sc
Criteria for short to supply during PH0: VBSTG > VBSTG,sc
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DC/DC regulators
The short detection feature is blanked during the charging in PH1, PH2, PH3 and during discharging in phases
PH5, PH6, PH7.
When a short is detected also the bit BST_GSH in the status register SMPS_STAT is set.
6.4
Power scenarios
The chapter describes the features and performance of the buck and boost regulators according to SBC mode.
6.4.1
Buck and boost in SBC Normal mode
In SBC Normal mode, the buck regulator operates in PWM mode with fixed switching frequency. The
microcontroller and other loads on the ECU are typically supplied with a 5V output voltage. All supervision
functions for buck regulator are available in SBC Normal mode (for more details, refer to Chapter 13.5.1,
Chapter 13.5.2, Chapter 13.5.3 and Chapter 13.8).
6.4.2
Buck and boost in SBC Stop mode operation
The SBC Stop mode operation is intended to reduce the total amount of quiescent current while still providing
supply for microcontroller. In order to achieve this, the buck regulator automatically changes the modulation
from PWM (Pulse Width Modulation) to PFM (Pulse Frequency Modulation) when entering SBC Stop mode. In
case the boost regulator in SBC Stop mode is enabled and running, it operates only in PWM mode.
6.4.2.1 Automatic transition from PFM to PWM in SBC Stop mode
In SBC Stop mode, the buck converter operates in PFM mode by default to reduce current consumption. If
more current is needed, an automatic transition from PFM to PWM modulation is implemented. When the
buck regulator output current exceeds the IPFM-PWM,TH threshold, the buck module changes the modulation to
PWM and an INT event is generated. In addition, the PFM_PWM bit on WK_STAT_1 is set.
In order to set the buck modulation again in PFM, it is necessary to write a Stop mode command to M_S_CTRL
register. This command has to be sent when the required buck output current is below the IPFM-PWM,TH
threshold.
When entering SBC Stop mode, the automatic transition from PFM to PWM mode is activated after the time
tlag, which is the transition time where the buck regulator loop changes the modulation technique. Two
possible values can be configured via SPI command.
The Figure 12 shows the timing transition from SBC Normal to SBC Stop mode.
SPI Commands
Buck modulation
Normal Mode
PWM
Stop Mode
Auto PFM ↔ PWM
PWM
t
tlag
Figure 12 Transition from SBC Normal to SBC Stop mode
The tlag is always present in case of PWM to PFM transition.
The automatic transition can be disabled by setting the bit PWM_AUTO to 0 in the HW_CTRL register.
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DC/DC regulators
6.4.2.2 Manual transition from PFM to PWM in SBC Stop mode
The PFM to PWM transition can also be controlled by the microcontroller or an external signal, directly by
using the WK pin as a trigger signal if an additional current is required in SBC Stop mode.
When the PWM_BY_ WK bit is set to 1, the DC/DC regulator can be switched from PFM to PWM using the WK pin.
A LOW level at the WK pin will switch the buck converter to PFM mode, a HIGH level will switch it to PWM mode.
In this configuration, the filter time is not taken into account because a defined signal from µC or external
source is expected.
If the PWM_BY_ WK bit is set to 0, the PFM modulation is used.
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DC/DC regulators
6.4.2.3 SBC Stop to Normal mode transition
The microcontroller sends an SPI command to switch from SBC Stop mode to SBC Normal mode. In this
transition, the buck regulator changes the modulation from PFM to PWM.
Once the SPI command for the SBC Normal mode transition is received the current is able to rise above the
specified maximum Stop mode current (IPFM-PWM,TH).
If the transition from SBC Stop mode to SBC Normal mode is carried out when the boost is enabled and
operating, it will continue to operate without any changes.
6.4.3
Buck and boost in SBC Sleep and Fail-Safe mode
In SBC Sleep or Fail-Safe mode, the buck and boost converter are off and not operating. The lowest quiescent
current is achievable.
6.4.3.1 SBC Sleep/Fail-Safe mode to Normal mode transition
In case of a wake-up event from WK pin or transceivers, the SBC will be set SBC Restart mode and as soon as
the reset is released, into SBC Normal mode.
In SBC Restart mode, the buck regulator is activated and ramping. The boost regulator is activated and
ramping again (in case the VS is below the selected threshold) in according the configuration selected in
SBC Normal mode. As soon as the buck output voltage exceeds the reset threshold, the RO pin is released.
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DC/DC regulators
6.5
Electrical characteristics
Table 10 Electrical characteristics
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition Number
Min. Typ. Max.
Buck regulator
Output voltage SBC Normal
mode
VCC1,out1 4.9 5.0 5.1
V
V
Normal mode (PWM)
1 mA < IVCC1 < 750 mA
6.3 V < VS < 28 V
1) Normal mode (PWM)
IVCC1 = 400 mA
VS = 5.5 V
P_6.5.1
Output voltage SBC Normal
mode
VCC1,out2 4.85 5.0 5.15
P_6.5.23
Boost disabled
Output voltage SBC Stop
mode
VCC1,out3 4.8 5.0 5.2
V
V
Stop mode (PFM)
1 mA < IVCC1 < IPFM-PWM,TH
6.3 V < VS < 18 V
P_6.5.2
Output voltage SBC Stop
mode
VCC1,out4 4.825 5.0 5.15
Stop mode (PFM)
1 mA < IVCC1 < 50 mA
6.3 V < VS < 18 V
P_6.5.40
Power Stage on-resistance
High-Side
RDSON1,HS
RDSON1,LS
–
–
–
–
1.3
1.3
Ω
Ω
VS = 6.5 V
IVS= 100 mA
P_6.5.3
Power Stage on-resistance
Low-Side
IBCKSW= 100 mA
P_6.5.20
Buck switching frequency
fBCK
405 450 495 kHz Normal mode (PWM)
P_6.5.5
Threshold automatic
transition PFM to PWM
IPFM-
PWM,TH
80
110 150 mA 2) Stop mode
P_6.5.14
6.3 V < VS < 18 V
Transition time from PWM to tlag
PFM
–
1
–
–
ms
µs
A
2) PWM_TLAG=1
(on HW_CTRL)
2) PWM_TLAG=0
(on HW_CTRL)
P_6.5.15
P_6.5.16
P_6.5.4
Transition time from PWM to tlag
PFM
–
100
Peak current limit of internal IBCK_LIM
high-side switch
0.85 1.05 1.2
6.32 6.65 6.88
VS = 13.5 V
Boost regulator
Boost voltage 1
VBST1_1
V
3) SBC Normal mode
P_6.5.11
VSUP = 3 V
IVS = 550 mA
Boost enabled
BOOST_V = 1
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DC/DC regulators
Table 10 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition
Number
Min. Typ. Max.
Boost voltage 2
VBST2_1
7.6
8
8.4
V
V
3) SBC Normal mode
SUP = 3 V
VS = 450 mA
Boost enabled
BOOST_V = 0
P_6.5.6
V
I
Boost switch ON/OFF voltage 1 VBST,TH1
6.35
7
7.5
Boost enabled
VS falling
P_6.5.7
threshold
BOOST_V = 1
Boost switch ON/OFF
hysteresis 1
VBST,HYS1 300 500 600 mV
Boost enabled
BOOST_V = 1
P_6.5.8
Boost switch ON/OFF voltage 2 VBST,TH2
threshold
9.5
10
1
10.5
1.2
–
V
Boost enabled
VS falling; BOOST_V = 0
P_6.5.32
P_6.5.33
P_6.5.28
Boost switch ON/OFF
hysteresis 2
VBST,HYS2 0.9
V
Boost enabled;
BOOST_V = 0
2)
BSTG rise switching time
tBSTG,rise
–
–
30
ns
V
> 3 V
SUP
20% - 80%
C
BSTG = 470 pF
2)
BSTG fall switching time
tBSTG,fall
30
–
ns
V
> 3 V
P_6.5.29
SUP
20% - 80%
BSTG = 470 pF
C
Overcurrent shunt voltage
threshold
VTH,SNS
fBST
199 210 221 mV
Boost enable
VSUP > 3 V
P_6.5.21
P_6.5.10
Boost switching frequency
Boost switch gate driver
Duration of PH1
405 450 495 kHz Normal mode (PWM)
2)
tPH1
tPH2
tPH3
tPH5
tPH6
tPH7
IPH1
IPH2
–
–
37.5
25
–
ns
ns
ns
ns
ns
ns
mA
mA
Ω
P_6.5.17
P_6.5.18
P_6.5.19
P_6.5.22
P_6.5.25
P_6.5.26
P_6.5.31
P_6.5.42
P_6.5.34
2)
2)
2)
2)
2)
2)
2)
Duration of PH2
–
Duration of PH3
124 131
–
Duration of PH5
–
62.5
25
31
-27
-7
–
Duration of PH6
–
–
Duration of PH7
29
–
–
Current during PH1
Current during PH2
–
–
–
Pull up resistance during PH3 RPH3
–
–
25
4) to internal gate driver
supply;
V
BSTG = 4 V
Internal gate driver supply
Vdrv_sup
4.75 5.0
–
V
no load;
P_6.5.35
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DC/DC regulators
Table 10 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition
Number
Min. Typ. Max.
2)
Current during PH5
Current during PH6
IPH5
IPH6
RPH7
–
–
–
23
15
–
–
mA
P_6.5.36
P_6.5.37
P_6.5.38
2)
–
mA
Pull down resistance during
PH7
15
Ω
–
–
BSTG short circuit detection
threshold
VBSTG,sc
3.23 3.4
3.57
V
P_6.5.39
1) Typical maximum current capability is given in Figure 13. The external components are in accordance with the
application information (refer to Chapter 15).
2) Not subject to production test; specified by design.
3) Values verified in characterization with boost converter specified in Chapter 15.1. Not subject to production test;
specified by design. Refer to Figure 14 for additional information.
4) Calculated value based on other measurements.
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DC/DC regulators
800
VCC1 tolerance +/-3%
VCC1 tolerance +/-2%
750
700
650
600
550
500
450
400
5.5
5.6
5.7
5.8
5.9
6
6.1
6.2
6.3
6.4
6.5
8
10
12
18
20
24
28
VS (V)
Figure 13 Maximum DCDC buck current capability versus VS.
Note: The Figure 13 is based on characterization results over temperature with external components specified
in Chapter 15.1.
1.4
1.2
1
0.8
0.6
0.4
Boost Output 6.65V
Boost Output 8V
0.2
3
4
5
6
7
8
VSUP (V)
Figure 14 Maximum DCDC boost current capability versus VSUP.
Note: Figure 14 is based on simulation results (specified by design), with boost converter external components
specified in Chapter 15.1.
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Voltage regulator 2
7
Voltage regulator 2
7.1
Block description
VS2
VCC2
Vref
1
Overtemperature
Shutdown
State
Machine
Bandgap
Reference
INH
GND
Figure 15 Module block diagram
Functional features
•
•
•
•
•
•
5 V low-drop voltage regulator
Protected against short to supply voltage, e.g. for off-board sensor supply
Can also be used for CAN supply
VCC2 undervoltage monitoring. Please refer to Chapter 13.6 for more information
Can be active in SBC Normal, SBC Stop, and SBC Sleep mode (not SBC Fail-Safe mode)
VCC2 switch off after entering SBC Restart mode. Switch off is latched, LDO must be enabled via SPI after
shutdown
•
•
Overtemperature protection
≥470 nF ceramic capacitor at output voltage for stability, with ESR < 1 Ωat f = 10 kHz, to achieve the voltage
regulator control loop stability based on the safe phase margin (bode diagram)
•
Output current capability up to IVCC2,lim
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OPTIREG™ SBC TLE9271QX
Voltage regulator 2
7.2
Functional description
In SBC Normal mode, VCC2 can be switched on or off via SPI.
For SBC Stop mode or Sleep mode, the VCC2 has to be switched on or off before entering the respective SBC
mode.
The output current of VCC2 is limited at IVCC2,lim
.
The VS2 pin is the dedicated supply pin for VCC2. VS2 can be connected to VS and therefore to the boost
output, or directly from battery after the reverse protection input diode.
For low-quiescent current, the output voltage tolerance is decreased in SBC Stop mode because only a low-
power mode regulator (with lower accuracy VCC2,out5) will be active for small loads. If the load current on VCC2
increases (typ. more than 1.5 mA), then the high-power mode regulator will also be enabled to support an
optimum dynamic load behavior. When both power mode regulators are active, the VCC2 quiescent current
will the typical increase by 2.9 mA.
If the load current on VCC2 decreases (typically below 1.3 mA), then the low-quiescent current mode is
resumed again disabling the high-power mode regulator.
Both regulators are active in SBC Normal mode.
Note: If the VCC2 output voltage is supplying external off-board loads, the application must consider the series
resonance circuit built by cable inductance and decoupling capacitor at load. Sufficient damping must
be provided.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Voltage regulator 2
7.3
Electrical characteristics
Table 11 Electrical characteristics
Tj = -40°C to +150°C; VS2 = 5.5 V to 28 V; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Unit Note or
Test Condition
Number
Min. Typ. Max.
Output voltage including line VCC2,out1 4.9
and load regulation
5.0
5.1
V
1) SBC Normal mode P_7.3.1
10 µA < IVCC2 < 100 mA
6.5 V < VS2 < 28 V
Output voltage including line VCC2,out2 4.9
and load regulation
5.0
5.1
V
1) SBC Normal mode P_7.3.2
10 µA < IVCC2 < 80 mA
6 V < VS2 < 28 V
Output voltage including line VCC2,out3 4.85 5.0
and load regulation
5.15
5.07
V
V
1) 10 µA < IVCC2 < 60 mA P_7.3.19
SBC Normal mode
2) SBC Normal mode P_7.3.18
8 V < VS2 < 18 V
Output voltage including line VCC2,out4 4.97
–
and load regulation
10 µA < IVCC2 < 5 mA
25°C< Tj <125°C
Output voltage including line VCC2,out5 4.9
and load regulation
5.05 5.2
V
V
SBC Stop, Sleep mode P_7.3.3
1 mA < IVCC2 < 3 mA
Output voltage including line VCC2,out6 4.9
5.05 5.25
SBC Stop, Sleep mode P_7.3.20
and load regulation
10 µA < IVCC2 < 1 mA
Output drop
VCC2,d1
–
–
–
500 mV
7502) mA
IVCC2 = 30 mA
S2 = 5 V
P_7.3.4
V
Overcurrent limitation
IVCC2,lim
100
current flowing out of P_7.3.5
pin
V
V
CC2 = 0 V
S2 = 13.5 V
1) In SBC Stop mode, the specified output voltage tolerance applies from ICC2 > 3 mA but with increased current
consumption.
2) Not subject to production test, specified by design.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Voltage regulator 2
Figure 16 VCC2 pass device on-resistance during low drop operation for ICC2 = 30 mA
Datasheet
46
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
8
High-speed CAN transceiver
8.1
Block description
VCAN
VCC1
SPI Mode
Control
RTD
Driver
CANH
CANL
Output
Stage
TXDCAN
Temp.-
Protection
+
timeout
To SPI diagnostic
VCAN
VCC1
RXDCAN
MUX
Receiver
Vs
Wake
Receiver
can block .vsd
Figure 17 Functional block diagram
8.2
Functional description
The Controller Area Network (CAN) transceiver part of the SBC provides high-speed (HS) differential mode
data transmission (up to 5 Mbaud) and reception in automotive and industrial applications. It works as an
interface between the CAN protocol controller and the physical bus lines compatible with ISO 11898-2: 2016
as well as SAE J2284.
The CAN transceiver offers low power modes to reduce current consumption. This supports networks with
partially powered down nodes. To support software diagnostic functions, a CAN Receive-Only mode is
implemented.
It is designed to provide excellent passive behavior when the transceiver is switched off (mixed networks,
clamp 15/30 applications).
A wake-up from the CAN Wake-Capable mode is possible via a message on the bus. Thus, the microcontroller
can be powered down or idled and will be woken up by the CAN bus activities.
The CAN transceiver is designed to withstand the severe conditions of automotive applications and to support
12 V applications.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
The transceiver can also be configured as wake-capable in order to save power and to ensure a safe transition
from SBC Normal to Sleep mode (to avoid losing messages).
Figure 18 shows the possible transceiver mode transition when changing the SBC mode.
SBC Mode
CAN Transceiver Mode
SBC Stop Mode
Receive Only
Receive Only
Wake Capable
OFF
OFF
SBC Normal Mode
SBC Sleep Mode
SBC Restart Mode
SBC Fail-Safe Mode
Wake Capable
Normal Mode
Wake Capable 2)
OFF 2)
OFF
Woken 1)
Wake Capable
Behavior after SBC Restart Mode - not coming from SBC Sleep Mode due to a wake up of the respective transceiver:
If the transceivers were configured to Normal Mode, or Receive Only Mode, then the mode will be changed to Wake Capable.
If it was Wake Capable, then it will remain Wake Capable. If it was off before SBC Restart Mode, then it will remain off.
1) After a wake event on CAN Bus.
2) Must be set to CAN wake capable / CAN OFF mode before entering SBC Sleep Mode.
Figure 18 CAN mode control diagram
CAN FD support
CAN FD stands for ‘CAN with Flexible Data Rate’. It is based on the well established CAN protocol as specified
in ISO 11898-1. CAN FD still uses the CAN bus arbitration method. The benefit is that the bit rate can be
increased by switching to a shorter bit time at the end of the arbitration process and then returning to the
longer bit time at the CRC delimiter before the receivers transmit their acknowledge bits. See also Figure 19.
In addition, the effective data rate is increased by allowing longer data fields. CAN FD allows the transmission
of up to 64 data bytes compared to the 8 data bytes from the standard CAN.
Standard CAN
message
Data phase
(Byte 0 – Byte 7)
CAN Header
CAN Footer
Example:
- 11 bit identifier + 8Byte data
CAN FD with
reduced bit time
Data phase
(Byte 0 – Byte 7)
CAN Header
CAN Footer
- Arbitration Phase
- Data Phase
500kbps
2Mbps
àaverage bit rate
1.14Mbps
Figure 19 Bite rate increase with CAN FD vs. standard CAN
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
CAN FD has to be supported by both physical layer and the CAN controller. If the CAN controller cannot
support CAN FD, then the respective CAN node must at least tolerate CAN FD communication. This CAN FD
tolerant mode is implemented in the physical layer.
8.2.1
CAN OFF mode
The CAN OFF mode is the default mode after the SBC has powered up. It is available in all SBC modes and is
used to completely stop CAN activities or when CAN communication is not needed. In CAN OFF mode, a wake-
up event on the bus will be ignored.
8.2.2
CAN Normal mode
The CAN transceiver is enabled via SPI. CAN Normal mode is designed for normal data transmission/reception
within the HS CAN network. This mode is available in SBC Normal mode.
Transmission
The signal from the microcontroller is applied to the TXDCAN input of the SBC. The bus driver switches the
CANH/L output stages to transfer this input signal to the CAN bus lines.
Enabling sequence
The CAN transceiver requires an enabling time tCAN,EN before a message can be sent on the bus. This means
that the TXDCAN signal can only be pulled LOW after the enabling time. If this is not ensured, then the TXDCAN
needs to be set back to HIGH (= recessive) until the enabling time is over. Only the next dominant bit will be
transmitted on the bus. Figure 20 shows different scenarios and explanations for CAN enabling.
V
TXDCAN
t
CAN
Mode
t CAN,EN
t CAN,EN
t CAN,EN
CAN
NORM AL
CAN
OFF
t
t
V
CANDIFF
Dom inant
Recessive
recessive
TXDCAN
level required
recessive TXDCAN
level required before
start of transmission
Correct sequence,
Bus is enabled after tCAN,
tCAN, not ensured, no
transmission on bus
tCAN, not ensured,
no transmission on bus
EN
EN
EN
Figure 20 CAN transceiver enabling sequence
Reduced electromagnetic emission
To reduce electromagnetic emissions (EME), the bus driver controls CANH/L slopes symmetrically.
Reception
Analog CAN bus signals are converted into digital signals at RXDCAN via the differential input receiver.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
8.2.3
CAN Receive-Only mode
In CAN Receive-Only mode (RX only), the driver stage is disabled but reception is still operational. This mode
is accessible by an SPI command in SBC Normal mode and in SBC Stop mode.
Note: The transceiver is still working properly in Receive-Only mode even if VCAN is not available because of an
independent receiver supply.
8.2.4
CAN Wake-capable mode (wake-up pattern)
This mode can be used in SBC Stop, Sleep, Restart and Normal mode by programming via SPI and it is used to
monitor bus activities. It is automatically accessed in SBC Fail-Safe mode. A wake-up pattern on the bus
results in a change of behavior of the SBC, as described in Table 12. As a signal to the microcontroller, the
RXDCAN pin is set to low and will stay low until the CAN transceiver changes to a different mode. After a wake-
up pattern event, the transceiver can be switched to CAN Normal mode via SPI for bus communication.
As shown in Figure 21, a wake-up pattern is signaled on the bus by two consecutive dominant bus levels for
at least tWake1 (filter time t > tWake1) and less than tWake2, each separated by a recessive bus level greater than
tWake1 and shorter than tWake2.
Entering CAN wake
capable
Bus recessive > tWAKE1
Bus dominant > tWAKE1
Ini
Bias off
Wait
Bias off
tWAKE2 expired
1
Bias off
Bus recessive > tWAKE1
t
WAKE2 expired
2
Bias off
Bus dominant > tWAKE1
Entering CAN Normal
or CAN Recive Only
3
Bias on
Figure 21 CAN wake-up pattern detection (WUP) according to the definition in ISO 11898-5
Rearming the transceiver for wake capability
After a BUS wake-up pattern event, the transceiver is woken. However, the CAN transceiver mode bits will still
show wake capable (=‘01’) so the RXDCAN signal will be pulled LOW. There are two possibilities for enabling
the CAN transceiver’s wake capable mode again after a wake-up event:
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
•
•
The CAN transceiver mode must be toggled, i.e. switched from Wake-Capable mode to CAN Normal mode,
CAN Receive-Only mode or CAN Off, before switching to CAN Wake-Capable mode again
Rearming occurs automatically when the SBC changes to SBC Stop, or SBC Fail-Safe mode to ensure wake-
up capability
•
•
If the SBC is in SBC Stop mode, the CAN is rearmed automatically if the SBC is set again in SBC Stop mode
CAN must be set to CAN Wake-Capable or CAN OFF mode before entering SBC Sleep mode
Notes
1. It is necessary to clear the CAN wake-up bit CAN_WU to become wake capable again. It is sufficient to toggle
the CAN mode.
2. The CAN module is supplied by an internal voltage when in CAN Wake-Capable mode, i.e. the module must not
be supplied through the VCAN pin during this time. Before changing the CAN mode to Normal mode, the
supply of VCAN has to be activated first.
Wake-up in SBC Stop and Normal mode
In SBC Stop mode, if a wake-up pattern is detected, it is always signaled by the INT output and in the
WK_STAT_1 SPI register. It is also signaled by RXDCAN pulled to LOW. The same applies for the SBC Normal
mode. The microcontroller should set the device from SBC Stop mode to SBC Normal mode; there is no
automatic transition to Normal mode.
For functional safety reasons, the watchdog will be automatically enabled in SBC Stop mode after a bus wake-
up event in case it was disabled before (if bit WD_EN_WK_BUS was configured to HIGH before).
Wake-up in SBC Sleep mode
Wake-up is possible via a CAN message. The wake-up pattern automatically transfers the SBC into the
SBC Restart mode and from there to Normal mode the corresponding RXDCAN pin is set to LOW. The
microcontroller is able to detect the LOW signal on RXDCAN and to read the wake source out of the
WK_STAT_1 register via SPI. No interrupt is generated when coming out of Sleep mode. The microcontroller
can now, for example, switch the CAN transceiver into CAN Normal mode via SPI to start communication.
Table 12 Action due to CAN bus wake-Up
SBC mode
SBC mode after wake
Normal mode
Stop mode
VCC1
INT
RXDCAN
LOW
Normal mode
Stop mode
ON
LOW
LOW
HIGH
HIGH
HIGH
ON
LOW
Sleep mode
Restart mode
Fail-Safe mode
Restart mode
Restart mode
Restart mode
Ramping up
ON
LOW
LOW
Ramping up
LOW
8.2.5
TXDCAN time-out feature
If the TXDCAN signal is dominant for a time t > tTXDCAN_TO, in CAN Normal mode, the TXDCAN time-out function
disables the transmission of the signal at the bus, setting the TXDCAN pin to recessive. This is implemented to
prevent the bus from being blocked permanently due to an error. The transmitter is disabled and fixed to
recessive. The CAN SPI control bits (CAN on BUS_CTRL_1) remain unchanged and the failure is stored in the
SPI flag CAN_FAIL. The CAN transmitter stage is activated again after the dominant time-out condition is
removed and the transceiver is automatically switched back to CAN Normal mode.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
8.2.6
Bus dominant clamping
If the HS CAN bus signal is dominant for a time t > tBUS_CAN_TO, in CAN Normal and Receiver-only mode, a bus
dominant clamping is detected and the SPI bit CAN_FAIL is set. The transceiver configuration stays
unchanged.
8.2.7
VCAN undervoltage detection
The voltage at the VCAN supply pin is monitored in CAN Normal and Receive-Only mode. If the HS CAN
transceiver is set in CAN Wake-Capable mode, the VCAN supply pin is enable after that a valid WUP is detected.
In case of VCAN undervoltage a signalization via SPI bit VCAN_UV is triggered and the TLE9271QX disables the
transmitter stage. If the CAN supply reaches a higher level than the under voltage detection threshold
(VCAN > VCAN_UV), the transceiver is automatically switched back to CAN Normal mode. The transceiver
configuration stays unchanged.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
8.3
Electrical characteristics
Table 13 Electrical characteristics
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; VCAN = 4.75 V to 5.25 V; RL = 60 Ω; CAN Normal mode; all voltages with
respect to ground, positive current flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
CAN supply voltage
CAN supply undervoltage
detection threshold
VCAN_UV
4.45
–
4.85
V
V
CAN Normal mode, P_8.3.1
hysteresis included
CAN bus receiver
Differential receiver
threshold voltage,
recessive to dominant edge
Vdiff,rd_N
–
0.80
0.90
8.0
–
Vdiff = VCANH - VCANL;
-12 V ≤ VCM(CAN) ≤
12 V;
P_8.3.2
CAN Normal mode
1)
Dominant state differential Vdiff_D_range 0.9
input voltage range
–
V
V
V
V
= VCANH - VCANL; P_8.3.50
diff
-12 V ≤ VCM(CAN) ≤
12 V;
CAN Normal mode
Differential receiver
threshold voltage,
dominant to recessive edge
Vdiff,dr_N
0.50
0.60
–
Vdiff = VCANH -VCANL
;
P_8.3.3
-12 V ≤ VCM(CAN) ≤
12 V;
CAN Normal mode
1)
Recessive state differential Vdiff_R_range -3.0
0.5
V
= VCANH - VCANL; P_8.3.51
diff
input voltage range
-12 V ≤ VCM(CAN) ≤
12 V;
CAN Normal mode
1)
Common mode range
CMR
-12
20
–
12
50
V
P_8.3.4
CANH, CANL input
resistance
Ri
40
kΩ
CAN Normal / Wake- P_8.3.5
capable mode;
Recessive state
-2 V ≤ VCANH/L ≤ +7 V
Differential input resistance Rdiff
40
80
100
kΩ
CAN Normal / Wake- P_8.3.6
capable mode;
Recessive state
-2 V ≤ VCANH/L ≤ +7 V
Input resistance deviation
between CANH and CANL
DRi
Cin
-3
–
–
3
%
1) Recessive state
CANH = VCANL = 5 V
P_8.3.7
P_8.3.8
P_8.3.42
V
2)
Input capacitance CANH,
CANL versus GND
20
10
40
20
pF
pF
V
= 5 V
TXDCAN
2)
Differential input
capacitance
Cdiff
–
V
= 5 V
TXDCAN
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
Table 13 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; VCAN = 4.75 V to 5.25 V; RL = 60 Ω; CAN Normal mode; all voltages with
respect to ground, positive current flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
0.8
Unit Note or
Test Condition
Number
Min.
Max.
Wake-up receiver
threshold voltage,
recessive to dominant edge
Vdiff, rd_W
–
1.15
V
V
-12 V ≤ VCM(CAN) ≤
12 V;
CAN Wake-capable
mode
P_8.3.9
1)
Wake-up receiver
Vdiff_D_range_ 1.15
–
8.0
V
= VCANH - VCANL; P_8.3.52
diff
dominant state differential
input voltage range
-12 V ≤ VCM(CAN) ≤
12 V;
W
CAN Wake-capable
mode
Wake-up receiver
threshold voltage,
dominant to recessive edge
Vdiff, dr_W
0.4
0.7
–
–
V
V
-12 V ≤ VCM(CAN) ≤
12 V;
CAN Wake-capable
mode
P_8.3.10
1)
Wake-up receiver
Vdiff_R_range_ -3.0
0.4
V
= VCANH - VCANL; P_8.3.53
diff
recessive state differential
input voltage range
-12 V ≤ VCM(CAN) ≤
12 V;
W
CAN Wake-capable
mode
CAN bus transmitter
CANH/CANL recessive
output voltage
(CAN Normal mode)
VCANL/H_NM 2.0
–
–
3.0
0.1
V
V
CAN Normal mode
P_8.3.11
P_8.3.43
V
TXDCAN = Vcc1
;
no load
CANH/CANL recessive
output voltage
(CAN Wake-capable mode)
VCANL/H_LP
Vdiff_r_N
Vdiff_r_W
VCANL
-0.1
-500
-200
0.5
CAN Wake-capable
mode;
V
TXDCAN = Vcc1
no load
CAN Normal mode; P_8.3.12
TXDCAN = Vcc1
no load
;
CANH, CANL recessive
output voltage difference
Vdiff = VCANH - VCANL
–
–
–
50
mV
mV
V
V
;
(CAN Normal mode)
CANH, CANL recessive
output voltage difference
Vdiff = VCANH - VCANL
200
2.25
CAN Wake-capable
mode;
P_8.3.44
V
TXDCAN = Vcc1
;
(CAN Wake-capable mode)
no load
CANL dominant output
voltage
3) CAN Normal mode; P_8.3.13
VTXDCAN = 0 V;
V
CAN = 5 V;
50 Ω ≤ RL ≤ 65 Ω
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
Table 13 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; VCAN = 4.75 V to 5.25 V; RL = 60 Ω; CAN Normal mode; all voltages with
respect to ground, positive current flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
–
Unit Note or
Test Condition
Number
Min.
Max.
CANH dominant output
voltage
VCANH
2.75
4.5
V
V
3) CAN Normal mode; P_8.3.14
V
V
TXDCAN = 0 V;
CAN = 5 V;
50 Ω ≤ RL ≤ 65 Ω
3) CAN Normal mode; P_8.3.15
CANH, CANL dominant
output voltage difference
Vdiff = VCANH - VCANL
Vdiff_d_N
1.5
–
2.0
–
2.5
70
VTXDCAN = 0 V;
V
CAN = 5 V;
50 Ω ≤ RL ≤ 65 Ω
CANH, CANL output voltage Vdiff_slope_rd
difference slope, recessive
to dominant
V/us 1) 30% to 70% of
measured
P_8.3.54
P_8.3.55
differential bus
voltage,
CL = 100 pF, RL = 60 Ω
CANH, CANL output voltage Vdiff_slope_dr
difference slope, dominant
to recessive
–
–
–
70
V/us 1) 70% to 30% of
measured
differential bus
voltage,
CL = 100 pF, RL = 60 Ω
CANH, CANL dominant
output voltage difference
Vdiff = VCANH - VCANL on
Vdiff_d_N_ext 1.5
5.0
V
1) CAN Normal mode; P_8.3.58
VTXDCAN = 0 V;
V
CAN = 5 V;
extended bus load range
RL = 2240 Ω
CANH short circuit current ICANHsc
-100
50
-80
80
-50
mA
mA
CAN Normal mode; P_8.3.16
V
CANHshort = -3 V
CAN Normal mode; P_8.3.17
CANLshort = 18 V
CANL short circuit current
Leakage current
ICANLsc
100
V
ICANH,lk
ICANL,lk
–
5
7.5
–
µA
VS = VCAN = 0 V;
P_8.3.18
0 V ≤ VCANH,L ≤ 5 V;
4)
R
= 0 / 47 kΩ
test
Receiver output RXDCAN
HIGH level output voltage
VRXDCAN,H
VRXDCAN,L
0.8 ×
VCC1
–
–
V
V
CAN Normal mode; P_8.3.19
IRXDCAN = -2 mA
LOW level output voltage
–
0.2 ×
CAN Normal mode; P_8.3.20
Vcc1
IRXDCAN = 2 mA
Transmission input TXDCAN
HIGH level input voltage
threshold
VTXDCAN,H
–
–
0.7 ×
Vcc1
V
CAN Normal mode; P_8.3.21
recessive state
Datasheet
55
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
Table 13 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; VCAN = 4.75 V to 5.25 V; RL = 60 Ω; CAN Normal mode; all voltages with
respect to ground, positive current flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
–
Unit Note or
Test Condition
Number
Min.
Max.
LOW level input voltage
threshold
VTXDCAN,L
0.3 ×
Vcc1
–
V
CAN Normal mode; P_8.3.22
dominant state
1)
TXDCAN input hysteresis
VTXDCAN,hys
–
0.12 ×
–
mV
P_8.3.23
Vcc1
TXDCAN pull-up resistance RTXDCAN
20
8
40
13
80
18
kΩ
-
P_8.3.24
CAN transceiver enabling
time
tCAN,EN
µs
7) CSN = HIGH to first P_8.3.25
valid transmitted
TXDCAN dominant
Dynamic CAN transceiver characteristics
Driver symmetry
VSYM
4.5
–
–
5.5
3.5
V
5) CAN Normal mode; P_8.3.45
VTXDCAN = 0 V / 5 V;
VSYM = VCANH + VCANL
V
CAN = 5 V;
CSPLIT = 4.7 nF;
50 Ω ≤ RL ≤ 60 Ω
Min. dominant time for bus tWake1
0.5
µs
-12 V ≤ VCM(CAN) ≤
P_8.3.26
wake-up
12 V;
V
diff ≤ 3 V
CAN Wake-capable
mode
Wake-up time-out, recessive tWake2
bus
0.5
–
–
–
10
ms
µs
7) CAN Wake-capable P_8.3.27
mode
7) CAN Wake-capable P_8.3.57
mode
BUS bias reaction time
tbias
250
V
CAN = 5 V;
CL = 100 pF;
GND = 100 pF;
C
RL = 60 Ω
Loop delay
tLOOP,f
–
–
150
150
255
255
ns
ns
5) CAN Normal mode; P_8.3.28
CL = 100 pF;
RL = 60 Ω;
(recessive to dominant)
V
C
CAN = 5 V;
RXDCAN = 15 pF
Loop delay
tLOOP,r
5) CAN Normal mode; P_8.3.29
CL = 100 pF;
(dominant to recessive)
RL = 60 Ω;
V
C
CAN = 5 V;
RXDCAN = 15 pF
Datasheet
56
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
Table 13 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; VCAN = 4.75 V to 5.25 V; RL = 60 Ω; CAN Normal mode; all voltages with
respect to ground, positive current flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
50
Unit Note or
Test Condition
Number
Min.
Max.
Propagation delay
TXDCAN LOW to bus
dominant
td(L),T
–
–
ns
ns
ns
CAN Normal mode; P_8.3.30
CL = 100 pF;
RL = 60 Ω;
VCAN = 5 V
Propagation delay
TXDCAN HIGH to bus
recessive
td(H),T
–
–
50
–
–
CAN Normal mode; P_8.3.31
CL = 100 pF;
RL = 60 Ω;
V
CAN = 5 V
Propagation delay
bus dominant to RXDCAN
LOW
td(L),R
100
CAN Normal mode; P_8.3.32
CL = 100 pF;
RL = 60 Ω;
V
CAN = 5 V;
CRXDCAN = 15 pF
Propagation delay
bus recessive to RXDCAN
HIGH
td(H),R
–
100
–
–
ns
ns
CAN Normal mode; P_8.3.33
CL = 100 pF;
RL = 60 Ω;
V
CAN = 5 V;
CRXDCAN = 15 pF
Received recessive bit width tbit(RXD)
400
550
CAN Normal mode; P_8.3.39
CL = 100 pF;
RL = 60 Ω;
V
CAN = 5 V;
CRXD = 15 pF;
bit(TXD) = 500 ns;
t
Parameter definition
in according to
Figure 23.
Transmitted recessive bit
width
tbit(BUS)
435
–
530
ns
CAN Normal mode; P_8.3.40
CL = 100 pF;
RL = 60 Ω;
VCAN = 5 V;
C
RXD = 15 pF;
tbit(TXD) = 500 ns;
Parameter definition
in according to
Figure 23.
Datasheet
57
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
Table 13 Electrical characteristics (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; VCAN = 4.75 V to 5.25 V; RL = 60 Ω; CAN Normal mode; all voltages with
respect to ground, positive current flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
–
Unit Note or
Test Condition
Number
Min.
Max.
Receiver timing symmetry6) ΔtRec
-65
40
ns
ns
ns
ns
CAN Normal mode; P_8.3.41
CL = 100 pF;
RL = 60 Ω;
VCAN = 5 V;
C
RXD = 15 pF;
tbit(TXD) = 500 ns;
Parameter definition
in according to
Figure 23.
Received recessive bit width tbit(RXD)
120
155
-45
–
–
–
220
210
15
CAN Normal mode; P_8.3.46
CL = 100 pF;
RL = 60 Ω;
V
CAN = 5 V;
CRXD = 15 pF;
bit(TXD) = 200 ns;
t
Parameter definition
in according to
Figure 23.
Transmitted recessive bit
width
tbit(BUS)
CAN Normal mode; P_8.3.47
CL = 100 pF;
RL = 60 Ω;
VCAN = 5 V;
C
RXD = 15 pF;
tbit(TXD) = 200 ns;
Parameter definition
in according to
Figure 23.
Receiver timing symmetry6) ΔtRec
CAN Normal mode; P_8.3.48
CL = 100 pF;
RL = 60 Ω;
V
C
CAN = 5 V;
RXD = 15 pF;
tbit(TXD) = 200 ns;
Parameter definition
in according to
Figure 23.
TXDCAN permanent
dominant time-out
tTXDCAN_TO
–
–
1.85
1.85
–
–
ms
ms
7) CAN Normal mode P_8.3.34
BUS permanent dominant tBUS_CAN_TO
7) CAN Normal mode P_8.3.35
time-out
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
1) Not subject to production test, specified by design.
2) Not subject to production test, specified by design, S2P - Method; f = 10 Mhz.
3) Voltage value valid for time < tTXDCAN_TO
4) Rtests between (VS/VCAN) and 0 V (GND).
.
5) VSYM shall be observed during dominant and recessive state and also during the transition dominant to recessive and
vice versa while TxD is simulated by a square signal (50% duty cycle), a frequency of 1 MHz.
6) tRec=tbit(RXD) -tbit(BUS)
.
7) Not subject to production test, tolerance defined by internal oscillator tolerance.
V
TXDCAN
VIO
GND
t
t
VDIFF
td(L),T
td(H),T
Vdiff, rd_N
Vdiff, dr_N
t d(L),R
td(H),R
t
t
loop,r
VRXDCAN
VIO
loop,f
0.8 x VIO
0.2 x VIO
GND
t
Figure 22 Timing diagrams for dynamic characteristics
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
High-speed CAN transceiver
70%
TXDCAN
30%
tLoop_f
5x tBit(TXD)
tBit(TXD)
Vdiff=CANH-CANL
900mV
tBit(Bus)
500mV
70%
RXDCAN
30%
tLoop_r
tBit(RXD)
Figure 23 From ISO 11898-2: tloop, tbit(TXD), tbit(Bus), tbit(RXD) definitions
Datasheet
60
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
9
LIN transceiver
9.1
Block description
VLIN
SPI Mode Control
VCC1
Driver
TxD Input
RTXD LI N
Temp.-
Protection
Current
RBUS
Output
Stage
TXDLIN
Timeout
Limit
LIN
To SPI Diagnostic
Receiver
VCC1
Filter
Vs
RXDLIN
Wake
Receiver
Figure 24 Block diagram
9.1.1
LIN specifications
The LIN network is standardized by international regulations. The device is compliant with the LIN2.2
specification. The physical layer specification LIN2.2 is a superset of the previous LIN specifications, like
LIN2.0, LIN2.1 or LIN1.3. The integrated LIN transceivers are according to the LIN2.2 standard.
The device is compliant to the physical layer standard SAE-J2602-2. The SAE-J2602-2 standard differs from the
LIN2.2 standard mainly by the lower data rate (10.4 kbps).
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
9.2
Functional description
The LIN bus is a single wire, bidirectional bus, used for in-vehicle networks. The LIN transceivers implemented
inside the TLE9271QX are the interface between the microcontroller and the physical LIN bus. The digital
output data from the microcontroller are driven to the LIN bus via the TXDLIN input pin on the TLE9271QX. The
transmit data stream on the TXDLIN input is converted to a LIN bus signal with an optimized slew rate to
minimize the EME level of the LIN network. The RXDLIN output sends back the information from the LIN bus to
the microcontroller. The receiver has an integrated filter network to suppress noise on the LIN bus and to
increase the EMI (Electromagnetic Immunity) level of the transceiver.
Two logical states are possible on the LIN bus according to the LIN Specification 2.2.
Every LIN network consists of a master node and one or more slave nodes. To configure the TLE9271QX for
master node applications, a resistor in the range of 1 kΩ and a reverse diode must be connected between the
LIN bus and the power supply VS.
The different transceiver modes can be controlled using the SPI LIN1, LIN2 bits.
The transceiver can also be configured to wake capable in order to save current and to ensure a safe transition
from SBC Normal to Sleep mode (to avoid losing messages).
Figure 25 shows the possible transceiver mode transitions when changing the SBC mode.
SBC Mode
LIN Transceiver Mode
SBC Stop Mode
Receive Only Wake Capable
OFF
OFF
SBC Normal Mode
SBC Sleep Mode
SBC Restart Mode
SBC Fail-Safe Mode
Receive Only Wake Capable Normal Mode
Wake Capable
OFF
OFF
Woken1
Wake Capable
1after a wake event on LIN Bus
Behavior after SBC Restart Mode - not coming from SBC Sleep Mode due to a wake up of the respective transceiver
:
If the transceivers had been configured to Normal Mode, or Receive Only Mode, then the mode will be changed to Wake
Capable. If it was Wake Capable, then it will remain Wake Capable . If it had been OFF before SBC Restart Mode , then it
will remain OFF .
Figure 25 LIN mode control diagram
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
9.2.1
LIN OFF mode
The LIN OFF mode is the default mode after power-up of the SBC. It is available in all SBC modes and is
intended to completely stop LIN activities or when LIN communication is not needed. In LIN OFF mode, a
wake-up event on the bus will be ignored.
9.2.2
LIN Normal mode
The LIN transceiver is enabled via SPI in SBC Normal mode. LIN Normal mode is designed for normal data
transmission/reception within the LIN network. The mode is available only in SBC Normal mode.
Transmission
The signal from the microcontroller is applied to the TXDLIN input of the SBC. The bus driver switches the
LIN output stage to transfer this input signal to the LIN bus line.
Enabling sequence
The LIN transceiver requires an enabling time tLIN,EN before a message can be sent on the bus. This means that
the TXDLIN signal can only be pulled LOW after the enabling time. If this is not ensured, then the TXDLIN needs
to be set back to HIGH (= recessive) until the enabling time is completed. Only the next dominant bit will be
transmitted on the bus. Figure 26 shows different scenarios and explanations for LIN enabling.
VTXDLIN
t
LIN
Mode
t
t LIN,EN
t
LIN,EN
LIN,EN
LIN
NORMAL
LIN OFF
t
t
V
LIN_BUS
Recessive
Dominant
recessive TXDLIN level
required bevore start of
transmission
recessive TXDLIN
level required
tLIN, EN not ensured, no
transmission on bus
tLIN, EN not ensured,
no transmission on bus
Correct sequence,
Bus is enabled aftertLIN,
EN
LIN_enabling_sequence.vsd
Figure 26 LIN transceiver enabling sequence
Reduced electromagnetic emission
To reduce electromagnetic emissions (EME), the bus driver controls LIN slopes symmetrically. The
configuration of the different slopes is described in Chapter 9.2.8.
Reception
Analog LIN bus signals are converted into digital signals at RXDLIN via the input receiver.
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
LIN transceiver
9.2.3
LIN Receive-Only mode
In LIN Receive-Only mode (RX only), the driver stage is disabled but reception is still possible. This mode is
accessible by an SPI command and is available in SBC Normal and SBC Stop mode.
9.2.4
LIN Wake-Capable mode
This mode can be used in SBC Stop, Sleep, Restart and Normal mode by programming via SPI and it is used to
monitor bus activities. It is automatically accessed in SBC Fail-Safe mode. A wake up is detected, if a recessive
to dominant transition on the LIN bus is followed by a dominant level of longer than tWK,Bus, followed by a
dominant to recessive transition. The dominant to recessive transition will cause a wake up of the
LIN transceiver. A wake-up results different behavior of the SBC, as described in Table 14. As a signalization to
the microcontroller, the RXDLIN pin is set LOW and will stay LOW until the LIN transceiver is changed to any
other mode. After a wake-up event, the transceiver can be switched to LIN Normal mode for communication.
Table 14 Action due to a LIN bus wake-up
SBC mode
SBC mode after wake
Normal mode
Stop mode
VCC1
INT
RXDLIN
LOW
Normal mode
Stop mode
ON
LOW
LOW
HIGH
HIGH
HIGH
ON
LOW
Sleep mode
Restart mode
Fail-Safe mode
Restart mode
Restart mode
Restart mode
Ramping up
ON
LOW
LOW
Ramping up
LOW
Rearming the transceiver for wake capability
After a bus wake-up event, the transceiver is woken. However, the LIN1, LIN2 transceiver mode bits will still
show wake capable (=‘01’) so that the RXDLIN signal will be pulled low. The Wake-Capable mode of the LIN
transceiver can be reenabled in one of two ways after a wake-up event:
•
•
•
By toggling the LIN transceiver mode, i.e. switched to LIN Normal mode, LIN Receive-Only mode or LIN Off,
before switching to LIN Wake-Capable mode again
Occurs automatically when the SBC changes to SBC Stop, SBC Sleep, or SBC Fail-Safe mode to ensure
wake-up capability
if the SBC is in SBC Stop mode, the LIN’s are rearmed automatically if the SBC is set again in SBC Stop mode
Wake-up in SBC Stop and SBC Normal mode
In SBC Stop mode, if a wake-up is detected, it is signaled by the INT output and in the WK_STAT_2 SPI register.
It is also signaled by RXDLIN put to LOW. The same applies for the SBC Normal mode. The microcontroller
should set the device to SBC Normal mode; there is no automatic transition to Normal mode.
For functional safety reasons, the watchdog will be automatically enabled in SBC Stop mode after a bus wake-
up event in case it was disabled before (if bit WD_EN_WK_BUS was configured to HIGH before).
Wake-up in SBC Sleep mode
Wake-up is possible via a LIN message (filter time t > tWK,Bus). The wake-up automatically transfers the SBC to
SBC Restart mode and from there to Normal mode. The corresponding RXDLIN pin in set to LOW. The
microcontroller is able to detect the low signal on RXDLIN and to read the wake source out of the WK_STAT_2
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
register via SPI. No interrupt is generated when coming out of Sleep mode. The microcontroller can now
switch the LIN transceiver into LIN Normal mode via SPI to start communication.
9.2.5
TXDLIN Time-out feature
If the TXDLIN signal is dominant for the time t > tBUS_LIN_TO, the TXDLIN time-out function deactivates the
LIN transmitter output stage temporarily. The transceiver remains in recessive state. The TXDLIN time-out
function prevents the LIN bus from being blocked by a permanent LOW signal on the TXDLIN pin caused by a
failure. The failure is stored in the SPI flag LIN1_FAIL, , and on BUS_STAT_1 and BUS_STAT_2 registers. The
LIN transmitter stage is activated again after the dominant time-out condition is removed.
The TXDLIN time-out feature can be disabled with SPI bit LIN_TXD_ TO for all LINs at the same time.
Recovery of the
microcontroller error
TXDLIN Time-Out due to
microcontroller error
Release after TXDLIN
Time-out
Normal Communication
ttimeout
ttorec
Normal Communication
TXDLIN
t
LIN
t
Figure 27 TXDLIN time-out function
9.2.6
Bus dominant clamping
If the LIN bus signal is dominant for a time t > tBUS_LIN_TO in LIN Normal or Receive-Only mode, then a bus
dominant clamping is detected and the SPI bits LIN1_FAIL, and are set. The transceiver configuration stays
unchanged.
9.2.7
Undervoltage detection
In case the supply voltage VLIN is dropping below the VLIN undervoltage detection threshold (VLIN < VLIN,UVD),
the TLE9271QX will set the LINx in Receive-Only mode (the transmitter is disabled). The receiver stage is active.
If the power supply VLIN reaches a higher level than the VLIN undervoltage detection threshold (VLIN >
V
LIN,UVD), the TLE9271QX continues with normal operation.
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
LIN transceiver
9.2.8
Slope selection
The LIN transceiver offers a LIN Low-Slope mode for 10.4 kBaud communication and a LIN Normal-Slope
mode for 20 kBaud communication. The only difference is the behavior of the transmitter. In LIN Low-Slope
mode, the transmitter uses a lower slew rate to further reduce the EME compared to Normal-Slope mode. This
complies with SAE J2602 requirements.
By default, the device works in LIN Normal-Slope mode. The selection of LIN Low-Slope mode is done by an
SPI bit LIN_LSM and will become effective as soon as CSN goes HIGH for all LINx. Only the LIN slope is changed.
The selection is accessible in SBC Normal mode only.
9.2.9
Flash programming via LIN
The device allows LIN flash programming, e.g. of another LIN slave with a communication of up to 115 kbps.
This feature is enabled by de-activating the slope control mechanism via a SPI command (bit LIN_FLASH) and
will become effective as soon as CSN goes HIGH’ for all LINx. The SPI bit can be set in SBC Normal mode.
Note: It is recommended to perform flash programming only at nominal supply voltage VS = 13.5 V to ensure
stable data communication.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
9.3
Electrical characteristics of the LIN transceiver
Table 15 Electrical characteristics: LIN transceiver
Tj = -40°C to +150°C, VLIN = 5.5 V to 18 V, RL = 500 Ω, all voltages with respect to ground, positive current flowing
into pin (unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition Number
Min. Typ. Max.
Receiver output (RXDLIN pin)
HIGH level output voltage
VRXDLIN,H 0.8 ×
–
–
–
V
V
IRXDLIN = -2 mA
bus = VS
IRXDLIN = 2 mA
bus = 0 V
P_9.3.1
P_9.3.2
VCC
V
LOW level output voltage
VRXDLIN,L
–
0.2 ×
VCC
V
Transmission input (TXDLIN pin)
HIGH level input voltage
TXDLIN input hysteresis
LOW level input voltage
VTXDLIN,H 0.7 ×
–
–
–
V
V
V
Recessive state
P_9.3.3
P_9.3.4
P_9.3.5
P_9.3.6
VCC
1)
VTXDLIN,hys
VTXDLIN,L
RTXDLIN
–
0.2 ×
VCC
–
–
0.3 ×
VCC
Dominant state
TXDLIN pull-up resistance
20
40
80
kΩ VTXDLIN = 0 V
LIN bus receiver (LIN pin)
Receiver threshold voltage, VBus,rd
recessive to dominant edge
0.4 × 0.45 × –
V
V
–
P_9.3.7
VLIN
VLIN
Receiver dominant state
VBus,dom
–
–
0.4 ×
LIN2.2 Param. 17
–
P_9.3.8
VLIN
Receiver threshold voltage, VBus,dr
–
0.55 × 0.60 × V
P_9.3.9
dominant to recessive edge
VLIN
VLIN
Receiver recessive state
Receiver center voltage
Receiver hysteresis
VBus,rec
VBus,c
0.6 ×
VLIN
–
–
V
LIN2.2 Param 18
LIN2.2 Param 19
P_9.3.10
P_9.3.11
P_9.3.12
P_9.3.13
P_9.3.14
0.475 0.5 × 0.525
× VLIN VLIN × VLIN
0.07 × 0.1 × 0.175
VLIN VLIN × VLIN
0.40 × 0.5 × 0.6 ×
V
VBus,hys
V
Vbus,hys = Vbus,rec - Vbus,dom
LIN2.2 Param 20
Wake-up threshold voltage VBus,wk
V
–
VLIN
VLIN
VLIN
2)
Dominant time for bus
wake-up
tWK,Bus
30
–
150
µs
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
Table 15 Electrical characteristics: LIN transceiver (cont’d)
Tj = -40°C to +150°C, VLIN = 5.5 V to 18 V, RL = 500 Ω, all voltages with respect to ground, positive current flowing
into pin (unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition Number
Min. Typ. Max.
LIN bus transmitter (LIN pin)
1)
Bus serial diode voltage drop Vserdiode 0.4
0.7
1.0
V
V
V
= VCC1
;
P_9.3.15
TXDLIN
LIN2.2 Param 21
Bus recessive output voltage VBUS,ro
0.8 ×
–
VLIN
VTXDLIN = high Level
P_9.3.16
P_9.3.20
P_9.3.21
VLIN
Bus short circuit current
IBUS,sc
40
100
150
mA VBUS = 18 V;
LIN2.2 Param 12
µA VLIN = 0 V;
-12 V ≤ VBUS ≤ 6 V;
LIN2.2 Param 15
µA VLIN = 0 V;
Leakage current
loss of ground
IBUS,lk1
-1000 -450 20
Leakage current
loss of battery
IBUS,lk2
IBUS,lk3
IBUS,lk4
–
–
20
–
P_9.3.22
P_9.3.23
P_9.3.24
P_9.3.25
0 V ≤ VBUS ≤ 18 V;
LIN2.2 Param 16
Leakage current
driver off
-1
–
–
mA VLIN = 18 V;
BUS = 0 V;
LIN2.2 Param 13
µA VLIN = 8 V;
BUS = 18 V;
V
Leakage current
driver off
–
20
47
V
LIN2.2 Param 14
Bus pull-up resistance
LIN input capacitance
RBUS
CBUS
20
30
kΩ Normal mode
LIN2.2 Param 26
1)
20
1
25
6
ρF
P_9.3.26
P_9.3.27
Receiver propagation delay td(L),R
bus dominant to RXDLIN
LOW
–
–
µs VCC = 5 V;
C
RXDLIN = 20 pF;
LIN2.2 Param 31
µs VCC = 5 V;
Receiver propagation delay td(H),R
1
6
P_9.3.28
bus recessive to RXDLIN HIGH
CRXDLIN = 20 pF;
LIN2.2 Param 31
Receiver delay symmetry
tsym,R
-2
8
–
2
µs tsym,R = td(L),R - td(H),R;
LIN2.2 Param 32
µs 2) time from enabling LIN P_9.3.39
P_9.3.29
LIN transceiver enabling time tLIN,EN
13
18
(CS HIGH) to first signal on
RXDLIN
1)2)
Bus dominant time out
tBUS_LIN
–
–
20
20
–
–
ms
ms
P_9.3.30
P_9.3.31
_TO
1)2)
TXDLIN dominant time out
tTXDLIN_LIN
V
= 0 V
TXDLIN
_TO
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
LIN transceiver
Table 15 Electrical characteristics: LIN transceiver (cont’d)
Tj = -40°C to +150°C, VLIN = 5.5 V to 18 V, RL = 500 Ω, all voltages with respect to ground, positive current flowing
into pin (unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition Number
Min. Typ. Max.
1)2)
TXDLIN dominant time out
recovery time
ttorec
–
10
–
µs
P_9.3.32
Duty cycle D1
(For worst case at 20 kbit/s)
LIN2.2 normal slope
D1
0.396
–
–
3) THRec(max) = 0.744 × VS; P_9.3.33
THDom(max) = 0.581 × VS;
V
LIN = 7.0…18 V;
tbit = 50 µs;
D1 = tbus_rec(min)/2 tbit
LIN2.2 Param 27
;
Duty cycle D2
(for worst case at 20 kbit/s)
LIN2.2 normal slope
D2
D3
D4
–
–
–
–
0.581
3) THRec(min) = 0.422 × VS; P_9.3.34
THDom(min) = 0.284 × VS;
VLIN = 7.0…18 V;
tbit = 50 µs;
D2 = tbus_rec(max)/2 tbit
;
LIN2.2 Param 28
3) THRec(max) = 0.778 × VS; P_9.3.35
THDom(max) = 0.616 × VS;
Duty cycle D3
(for worst case at 10.4 kbit/s)
SAE J2602 low slope
0.417
–
V
LIN = 7.0…18 V;
tbit = 96 µs;
D3 = tbus_rec(min)/2 tbit
LIN2.2 Param 29
;
Duty cycle D4
(for worst case at 10.4 kbit/s)
SAE J2602 low slope
–
0.590
3) THRec(min) = 0.389 × VS; P_9.3.36
THDom(min) = 0.251 × VS;
VLIN = 7.0…18 V;
tbit =96 µs;
D4 = tbus_rec(max)/2 tbit
;
LIN2.2 Param 30
1) Not subject to production test, specified by design.
2) Not subject to production test, tolerance defined by internal oscillator tolerance.
3) Bus load conditions concerning LIN spec 2.2 CLIN, RLIN = 1 nF, 1 kΩ / 6.8 nF, 660 Ω / 10 nF, 500 Ω.
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OPTIREG™ SBC TLE9271QX
LIN transceiver
VLIN
TXDLIN
RXDLIN
100 nF
RLIN
CRXDLIN
WK
LIN
GND
CLIN
Figure 28 Simplified test circuit for dynamic characteristics
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
LIN transceiver
tBit
tBit
tBit
TXDLIN
(input to
transmitting node )
tBus _dom (max )
tBus_rec (min)
Thresholds of
receiving node 1
THRec (max)
THDom (max)
VSUP
(Transceiver supply
of transmitting
node )
Thresholds of
receiving node 2
THRec(min)
THDom(min)
tBus _dom (min )
tBus_rec(max)
RXDLIN
(output of receiving
node 1)
td(L),R (1)
td(H),R(1)
RXDLIN
(output of receiving
node 2)
t(L),R(2)
td(H),r(2)
Duty Cycle1 = tBUS_rec(min) / (2 x t
)
BIT
Duty Cycle2 = tBUS_rec(max) / (2 x tBIT
)
Figure 29 Timing diagram for dynamic characteristics
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Wake input
10
Wake input
10.1
Block description
Internal Supply
IPU_WK
WKx
+
-
tWK
IPD_WK
VRef
Logic
MONx_Input_Circuit_ext.vsd
Figure 30 Wake input block diagram
Features
•
•
•
•
•
•
One high-voltage inputs with 3 V (typ.) threshold voltage
Wake-up capability for power saving modes
Switch feature for DC/DC mode (PFM/PWM) in Stop mode
Sensitive to level changes LOW to HIGH and HIGH to LOW
Pull-up and pull-down current, configurable via SPI
In SBC Normal and SBC Stop mode, the level of WK pin can be read via SPI
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Wake input
10.2
Functional description
The wake input pin is edge-sensitive input with a switching threshold of typically 3 V. This means that both
transitions, HIGH to LOW and LOW to HIGH, result in SBC signalling. The signal is created in one of the
following ways:
•
•
By triggering the interrupt in SBC Normal and SBC Stop mode
Waking up the device in SBC Sleep and SBC Fail-Safe mode
The WK pin can also be configured as a selection pin for PFM / PWM mode in Stop mode using the PWM_BY_
WK bit of HW_CTRL register. In this case a LOW level at the WK pin will set the buck converter modulation to
PFM mode, a HIGH level will set the buck converter modulation to PWM mode. In this configuration, the filter
time is not taken into account because a defined signal from µC is expected.
Two different wake detection modes can be selected via SPI:
•
•
Static sense: WK inputs are always active
Cyclic sense: WK inputs are only active for a certain time period (see Chapter 5.2.1)
The filtering time is tFWK. The wake-up capability can be enabled or disabled via SPI command.
Figure 31 shows a typical wake-up timing and parasitic filter.
VWK
VWK,th
VWK,th
t
t
VINT
tWK,f
tWK,f
tINT
No Wake Event
Wake Event
Figure 31 Wake-up filter timing for static sense
The state of the WK pin (LOW or HIGH) can always be read in SBC Normal and Stop mode at the bit WK on
register WK_LVL_STAT.
When setting the bit WK_EN, to 1, the device wakes up from Sleep mode with a HIGH to LOW or LOW to HIGH
transition on the selected WK input, in SBC Stop and SBC Normal mode an interrupt will be generated. From
SBC Fail-Safe mode the device will always go to SBC Restart mode with a HIGH to LOW or LOW to HIGH
transition. The wake source for a wake via wake pin can be read in the register WK_STAT_1 at the bit WK_WU.
10.2.1
Wake input configuration
To ensure a defined and stable voltage levels at the internal comparator input it is possible to configure
integrated current sources via the SPI register WK_PUPD_CTRL. The Table 16 shows the possible pull-up and
pull-down current.
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Wake input
Table 16 Pull-up/pull-down resistor
WK_PUPD_1 WK_PUPD_0 Output current Note
0
0
No current
source
WK is floating if left open (default setting)
0
1
Pull-down
current
WK input internally pulled to GND
1
1
0
1
Pull-up current WK input internally pulled to 5 V
Automatic
switching
If a HIGH level is detected the pull-up current is activated, if
LOW level is detected the pull down current is activated
Note: If there is no pull-up or pull-down configured on the WK input, then the respective input should be tied to
GND or VS on board to avoid unintended floating and waking of the pin.
An example illustration of automatic switching configuration is shown in Figure 32.
IWKth_min
IWKth_max
IWK
VWKth
Figure 32 Illustration for pull-up/pull-down current sources with automatic switching configuration
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Wake input
10.3
Electrical characteristics
Table 17 Electrical characteristics
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
WK input pin characteristics
Wake-up/monitoring VWKth
2
3
4
V
Hysteresis included
P_10.3.1
threshold voltage
Threshold hysteresis
VWKNth,hys 0.1
–
0.7
-3
V
–
P_10.3.2
P_10.3.3
P_10.3.4
WK pin pull-up current IPU_WK
-20
3
-10
10
µA
µA
VWK_IN = 4 V
VWK_IN = 2 V
WK pin pull-down
current
IPD_WK
20
Input leakage current ILK,l
-2
–
2
µA
0 V < VWK_IN < 28 V
SBC Stop or Sleep
mode
P_10.3.5
Timing
1)
Wake-up filter time
tFWK
–
16
–
µs
P_10.3.6
1) Not subject to production test, tolerance defined by internal oscillator tolerance.
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Interrupt function
11
Interrupt function
11.1
Block and functional description
Vcc1
INT
Time
out
Interrupt logic
Figure 33 Interrupt block diagram
The interrupt is used to signal wake-up events in real time to the microcontroller. The interrupt block is
designed as a push/pull output stage as shown in Figure 33. An interrupt is triggered and the INT pin is pulled
LOW (active LOW) for tINT in SBC Normal and Stop mode and it is released again once tINT is expired. The
minimum HIGH-time of INT between two consecutive interrupts is tINTD. An interrupt does not automatically
cause a SBC mode change.
The following wake-up events will be signaled via INT:
•
•
•
All wake-up events stored in the wake status SPI register WK_STAT_1 and WK_STAT_2
An interrupt is only triggered if the respective function is also enabled as a wake source
The register WK_LVL_STAT is not generating interrupts
In addition to this behavior, an INT will be triggered when:
•
•
The SBC is sent to SBC Stop mode and not all bits were cleared in the WK_STAT_1 and WK_STAT_2 register
An automatic transition PFM to PWM in the buck when the SBC is in SBC Stop mode (for more details please
refer to Chapter 6.4.2.1)
The SPI status registers are updated at every falling edge of the INT pulse. All interrupt events are stored in the
respective register (except the register WK_LVL_STAT) until the register is read and cleared via SPI command.
A typical interrupt behavior is shown in Figure 34.
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Interrupt function
WK event 1
INT
WK event 2
tINTD
tINT
Update of
WK_STAT register
Update of
WK_STAT register
optional
no WK
SPI
Read & Clear
WK_STAT
contents
WK event 1
no WK
WK event 2
SPI
Read & Clear
No SPI Read & Clear
Command sent
WK event 1 and WK
event 2
WK_STAT
contents
no WK
Interrupt_Behavior.vsd
Figure 34 Interrupt signaling behavior
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Interrupt function
11.2
Electrical characteristics
Table 18 Interrupt output
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; SBC Normal mode; all voltages with respect to ground; positive current
defined flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
Interrupt output; pin INT
INT HIGH output voltage VINT,H
0.8 ×
VCC1
–
–
–
V
V
IINT = -2 mA;
INT = OFF
P_11.2.1
P_11.2.2
INT LOW output voltage VINT,L
–
0.2 ×
VCC1
IINT = 2 mA;
INT = ON
1)
INT pulse width
tINT
–
–
100
100
–
–
µs
µs
P_11.2.3
P_11.2.4
INT pulse minimum delay tINTD
1) between
time
consecutive pulses
1) Not subject to production test; tolerance defined by internal oscillator tolerance.
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Fail-safe outputs and fail-safe input
12
Fail-safe outputs and fail-safe input
12.1
Functional description
5V_int
SBC Init Mode /
Normal mode
RFO1
FO1
Failure Logic
5V_int
5V_int
SBC Init
Mode
T FSI
RFSI
T test
RTEST
FO2/FSI
FO3/TEST
T FO_PL
T FO_PL
Failure Logic
Failure Logic
Figure 35 Fail-safe input and outputs block diagrams
The fail outputs consist of a failure logic block and three low-side switches. In case of a failure, the FO outputs
are activated and the SPI bit FO_ON_STATE in the register DEV_STAT is set.
The fail outputs are activated under the following failure conditions:
Failure conditions
•
•
•
•
After one or two watchdog trigger failures depending on configuration
Thermal shutdown TSD2
VCC1 short to GND
RO clamped to HIGH
Configurations
It is possible to configure the FOx activation after a Watchdog trigger using the CFG2 bit. Please refer to the
HW_CTRL register.
In order to deactivate the fail output, the failure conditions (e.g. TSD2) must not be present anymore and the
bit FO_ON_STATE needs to be cleared via SPI command. In case of watchdog fail, the fail output may only be
disabled after the watchdog has been triggered successfully, i.e. the WD_FAIL bit must be cleared.
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Fail-safe outputs and fail-safe input
Note: The fail outputs are triggered for any of the above described failures and not only for failures leading to
the Fail-Safe mode.
The three fail outputs are activated in parallel. The FO1 gives a static LOW signal in case of fail output
activation. The FO2 provides a signal with a fixed frequency pulse and a duty cycle of 50% to generate an
indicator signal. The FO3 provides a PWM signal with a fixed frequency and duty cycle of 20%, e.g. to generate
a dimmed bulb signal.
Fail outputs
•
•
•
FO1: Static fail output
FO2: 1.25 Hz 50% duty cycle (typ.)
FO3: 100 Hz 20% duty cycle (typ.)
Pull-up configuration
The integrated pull-up resistors are active if following conditions are fulfilled:
•
•
•
FO1: SBC Init mode OR SBC Normal mode
FO2: (SBC Init mode OR SBC Normal mode) AND FSI_FO2 = 0
FO3: SBC Init mode
12.2
Fail-safe input
The FO2 pin can be used as safety feature called fail-safe input.
A digital signal has to be generated by the microcontroller and the TLE9271QX must detect the Low-to-High
transition whitin tFSI,W window time. The feature is enabled by default after power on. It can be disabled using
the SPI command (FSI_FO2=1 on HW_CTRL register).
If there is no signal from the microcontroller, the TLE9271QX sets the FSI_FAIL on DEV_STAT and both FO1
and FO3 are activated. The device remains in the same mode and neither reset nor interrupt will be triggered.
The SPI status bit FSI_FAIL can only be cleared after a new rising edge on the FSI pin.
The Figure 36 shows the timing diagram and level description of FSI input signal.
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Fail-safe outputs and fail-safe input
FSI (from µC)
tFSI,W
tFSI,W
tFSI,W
tFSI,W
t
t
FO1/FO3
tFSI,W
tFSI,W
tFSI,W
OFF
ON
OFF
0
1
0
1
SPI “FSI_FAIL”
SPI cmd.
FO_ON=0
SPI cmd .
FSI_FAIL clear
Figure 36 FSI timing diagram and level description
The fail-safe input feature is available only in SBC Normal mode.
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Fail-safe outputs and fail-safe input
12.3
Electrical characteristics
Table 19 Interrupt output
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; SBC Normal mode; all voltages with respect to ground; positive current
defined flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
Fail output; pin FO1, FO2, FO3
FO LOW output voltage
(active)
VFO,L
IFO,H
–
0
0.6
–
1
2
V
IFO = 5 mA
P_12.3.1
P_12.3.2
FO HIGH output current
(inactive)
µA
VFO = 28 V
FO3 test mode select
FO3/TEST HIGH-input
voltage threshold
VTEST,H
VTEST,L
–
–
–
0.7 ×
VCC1
V
–
P_12.3.28
P_12.3.29
P_12.3.30
P_12.3.31
P_12.3.32
FO3/TEST LOW-input
voltage threshold
0.3 ×
VCC1
–
–
–
–
V
–
1)
FO3/Hysteresis of TEST
input voltage
VTEST,Hys
–
–
–
0.2 ×
VCC1
V
FO3/Pull-up resistance at RTEST
pin TEST
5
kΩ
µs
VTEST = 0.2 × VCC1
1)
FO3/TEST input filter time tTEST
16
FO2/FSI input select
FSI HIGH-input voltage
threshold
VFSI,H
VFSI,L
–
–
–
0.7 ×
VCC1
V
V
V
–
P_12.3.6
P_12.3.7
P_12.3.8
FSI LOW-input voltage
threshold
0.3 ×
VCC1
–
–
1)
FSI hysteresis of input
voltage
VFSI,Hys
–
0.2 ×
VCC1
–
FSI pull-up resistance
FSI input filter time
FSI window time
FO1
RFSI
tFSI
–
–
–
40
–
–
kΩ
µs
µs
VFSI = 0.2 × VCC1
P_12.3.9
P_12.3.10
P_12.3.11
1)
1.5
240
1)
tFSI,W
–
1)
FO1 pull-up resistance
RFO1
–
40
–
kΩ
V
= 0.2 × VCC1
P_12.3.12
FO1
1) Not subject to production test; specified by design.
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OPTIREG™ SBC TLE9271QX
Supervision functions
13
Supervision functions
13.1
Reset function
VCC1
RO
Resetlogic
Incl. filter & delay
Figure 37 Reset block diagram
13.1.1
Reset output description
The reset output pin RO provides reset information to the microcontroller, for example, in the event that the
output voltage has fallen below the undervoltage threshold VRT1/2/3. In case of a reset event due to an
undervoltage on buck regulator output voltage, the reset output RO is pulled to LOW after the filter time tRF
and stays LOW as long as the reset event is present plus a reset delay time tRD1. When connecting the SBC to
battery voltage, the reset signal remains LOW initially. When the buck regulator output voltage has reached
the default reset threshold VRT1,f, the reset output RO is released to HIGH after the reset delay time tRD1 (for a
timing diagram, see also Figure 4). A reset can also occur due to a watchdog trigger failure. The reset
threshold can be adjusted via SPI, the default reset threshold is VRT1,f. The RO pin has an integrated pull-up
resistor. If a reset is triggered, it will pull LOW for buck regulator output voltage (VCC1) ≥ 1 V and for VS ≥ VPOR,f
.
RO trigger timing regarding buck regulator undervoltage and watchdog trigger is shown in Figure 38.
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Supervision functions
VCC
VRT1
t < tRF
The reset threshold can be
configured via SPI in SBC
Normal Mode, default is VRT1
undervoltage
t
tCW
tOW
tRD1
tCW
tLW
tRD1
tLW
tCW
tOW
SPI
RO
SPI
Init
WD
Trigger
WD
Trigger
SPI
Init
t
t
tRF
tLW= long open window
tCW= closed window
tOW= open window
SBC Init
SBC Normal
SBC Restart
SBC Normal
Figure 38 Reset timing diagram
13.1.2
Reset clamp to high
The RO pin is monitored internally. This feature detects if the RO pin is clamped to a high value from outside.
The reset clamp to high is detected if the SBC generates a reset but the monitoring feedback senses a high
level. The reset clamp is stored in RO_CL_HIGH bit on the DEV_STAT register.
The feature is available in SBC Normal, Stop and Restart mode. In SBC Sleep or Fail-Safe mode, the RO is not
monitored because the buck regulator is disabled.
In case of watchdog failure, the reset clamp can be detected only if VCC1_UV on SUP_STAT register is 0 (no
buck regulator undervoltage detected).
In case of a buck regulator undervoltage event, the reset clamp can be detected only after the buck regulator
output voltage rises above the reset threshold.
13.1.3
Soft reset description
In SBC Normal and Stop mode, it is also possible to trigger a soft reset via an SPI command in order to bring
the SBC into a defined state in case of failures. In this case, the microcontroller must send an SPI command
and set the MODE bits to ‘11’ in the M_S_CTRL register. As soon as this command becomes valid, the SBC is
set back to SBC INIT mode and all SPI registers are set to their default values (see SPI Chapter 14.5 and
Chapter 14.6).
No Reset (RO) is triggered when the soft reset is executed.
Note: The device has to be in SBC Normal mode or SBC Stop mode when sending this command. Otherwise, it
will be ignored.
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Supervision functions
13.2
Watchdog function
The watchdog is used to monitor the software execution of the microcontroller and to trigger a reset if the
microcontroller stops serving the watchdog due to a lock up in the software.
Two different types of watchdog functions are implemented and can be selected via the bit WD_WIN:
•
•
Time-out watchdog (default value)
Window watchdog
The respective watchdog function can be selected and programmed in SBC Normal mode. The configuration
remains unchanged in SBC Stop mode.
Refer to Table 20 to match the SBC modes with the respective watchdog modes.
Table 20 Watchdog functionality by SBC modes
SBC mode
Watchdog mode
Remarks
INIT mode
Start with long open window Watchdog starts with long open window after RO is
released
Normal mode
Stop mode
WD programmable
Window watchdog, time-out watchdog
Watchdog is fixed or OFF
Watchdog OFF must be performed in SBC Normal
mode
Sleep mode
Restart mode
Fail-Safe mode
OFF
OFF
OFF
SBC will start with long open window when entering
SBC Normal mode
SBC will start with long open window when entering
Normal mode
SBC will start with long open window when entering
SBC Normal mode
The watchdog timing is programmed using an SPI command. As soon as the watchdog is programmed, the
timer starts with the new setting and the watchdog must be served.The watchdog is triggered by sending a
valid SPI-write command to the watchdog configuration register. The trigger SPI command is executed when
the chip select input (CSN) becomes HIGH.
When coming from SBC Init or Restart mode the watchdog timer is always started with a long open window.
The long open window (tLW) allows the microcontroller to run its initialization sequences and then to trigger
the watchdog via the SPI.
The watchdog timer period can be selected via the watchdog timing bit field (WD_TIMER) and is in the range of
10 ms to 1000 ms. This setting is valid for both watchdog types.
The following watchdog timer periods are available:
•
•
•
•
•
•
•
WD setting 1: 10 ms
WD setting 2: 20 ms
WD setting 3: 50 ms
WD setting 4: 100 ms
WD setting 5: 200 ms (reset value)
WD setting 6: 500 ms
WD setting 7: 1000 ms
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Supervision functions
In case of a watchdog reset, SBC Restart mode is started and the SPI bits WD_FAIL are set. Once the RO goes
HIGH again the watchdog immediately starts with a long open window and the SBC enters automatically
SBC Normal mode.
In SBC Development mode, no reset is generated due to a watchdog failure, the watchdog is OFF.
After 3 consecutive resets due to watchdog failures, additional resets can be prevented by setting the
MAX_3_RST bit on WD_CTRL register. The SBC will then remain in SBC Normal or Stop mode (the device will
not reenter SBC Restart mode).
13.2.1
Time-out watchdog
The time-out watchdog is an easier and less secure watchdog than a window watchdog as the watchdog
trigger can be done at any time within the configured watchdog timer period.
A correct watchdog service immediately results in starting a new watchdog timer period. Taking the
tolerances of the internal oscillator into account leads to the safe trigger area as defined in Figure 39.
If the time-out watchdog period elapses, a watchdog reset is created by setting the reset output RO low and
the SBC switches to SBC Restart mode.
Typical timout watchdog trigger period
tWD x 1.50
open window
uncertainty
Watchdog Timer Period (WD_TIMER)
tWD x 1.20
tWD x 1.80
t / [tWD_TIMER
]
safe trigger area
Figure 39 Time-out watchdog definitions
13.2.2
Window watchdog
Compared to the time-out watchdog, the characteristic of the window watchdog is that the watchdog timer
period is divided between a closed and an open window. The watchdog must be triggered inside the open
window.
A correct watchdog trigger results in starting the window watchdog period by a closed window followed by an
open window.
The watchdog timer period is at the same time the typical trigger time and defines the middle of the open
window.
Taking the oscillator tolerances into account leads to a safe trigger area of:
tWD × 0.72 < safe trigger area < tWD × 1.20
The typical closed window is defined to a width of 60% of the selected window watchdog timer period. Taking
the tolerances of the internal oscillator into account leads to the timings as defined in Figure 40.
A correct watchdog service immediately results in starting the next closed window.
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Supervision functions
Should the trigger signal meet the closed window or should the watchdog timer period elapse, then a
watchdog reset is created by setting the reset output RO LOW. The SBC switches to SBC Restart mode.
tWD x 0.6
tWD x 0.9
Typ. closed window
Typ. open window
tWD x 0.48
tWD x 0.72
tWD x 1.0
tWD x 1.20
tWD x 1.80
closed window
uncertainty
open window
uncertainty
Watchdog Timer Period (WD_TIMER)
t / [tWD_TIMER
]
safe trigger area
Figure 40 Window watchdog definitions
13.2.3
Watchdog setting check sum
A check sum bit is part of the SPI command to trigger the watchdog and to set the watchdog setting.
The sum of the 8 bits in the register WD_CTRL needs to be even. This is realized by either setting the bit
CHECKSUM to “0” or “1”.
If the check sum is wrong the SPI command is ignored, i.e. the watchdog is not triggered or the settings are not
changed and the bit SPI_FAIL is set.
The checksum is calculated by taking all 8 data bits into account.
(13.1)
CHKSUM = Bit15
…
Bit8
13.2.4
Watchdog during SBC Stop mode
The watchdog can be disabled for SBC Stop mode in SBC Normal mode. For safety reasons, there is a special
sequence to be ensured in order to disable the watchdog. The sequence can be implemented only if the FSI
feature is disabled (FSI_FO2 = 1 on HW_CTRL register). The sequence is shown in Figure 41.
Two different bits (WD_STM_ EN_0 and WD_STM_ EN_1) in the registers WD_CTRL and WK_CTRL_1 need to
be set.
If a sequence error occurs, then the bit WD_STM_ EN_1 is cleared and the sequence has to be started again.
The watchdog can be enabled by triggering the watchdog in SBC Stop mode or by switching back to
SBC Normal mode via SPI. In both cases, the watchdog will start with a long open window and the bits
WD_STM_ EN_1 and WD_STM_ EN_0 are cleared. After the long open window, the watchdog has to be served
as configured in WD_CTRL register.
Note: The bit WD_STM_ EN_0 will be cleared automatically when the sequence is started and it was “1” before.
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Supervision functions
Correct WD disabling
Sequence Errors
sequence
•
Not setting the
Set bit
WD_STM_EN_1 = 1
WD_STM_EN_0 bit with the
next watchdog trigger after
having set WD_STM_EN_1
with next WD Trigger
•
Staying in Normal Mode
Set bit
WD_STM_EN_0 = 1
Before subsequent WD Trigger
Will enable the WD:
•
Switching back to SBC
Normal Mode
Change to
SBC Stop Mode
•
Triggering the watchdog
WD is switched off
Figure 41 Watchdog disabling sequence in SBC Stop mode
13.2.4.1 WD start in SBC Stop mode due to bus wake
In SBC Stop mode, the WD can be disabled. In addition, a feature can be enabled to start the watchdog with
any bus wake during SBC Stop mode. The feature is enabled by setting the bit WD_EN_WK_BUS. This bit can
only be changed in SBC Normal mode and needs to be programmed before entering SBC Stop mode. It is not
reset by the SBC. The sequence described in Chapter 13.2.4 needs to be followed to disable the watchdog.
With this function enabled, the WD will be restarted by any wake event on CAN or LINx. The wake event on CAN
or LINx will generate an interrupt and the RXDLINx or RXDCAN will be pulled to LOW. The watchdog starts with
long open window. The watchdog can be triggered in SBC Stop mode or the SBC can be switched to
SBC Normal mode. To disable the watchdog again, the SBC needs to be switched to SBC Normal mode and the
sequence must be sent again. The sequence is shown in Figure 42.
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Supervision functions
Correct WD disabling
Sequence Errors
sequence
•
Missing to set bit
Set bit
WD_EN_WK_BUS = 1
WD_STM_EN_0 with the
next watchdog trigger after
having set WD_STM_EN_1
•
Staying in Normal Mode
Set bit
WD_STM_EN_1 = 1
with next WD Trigger
Will enable the WD :
Set bit
WD_STM_EN_0 = 1
•
Switching back to SBC
Normal Mode
Before subsequent WD Trigger
•
•
•
Triggering the watchdog
Wake on CAN
Change to
SBC Stop Mode
Wake on LIN
WD is switched off
Figure 42 Watchdog disabling sequence (with wake via bus)
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Supervision functions
13.3
VS power on reset
When powering up, the device detects the VS power on reset when VS > VPOR,r, and the SPI bit POR is set to
indicate that all SPI registers are set to POR default settings. The buck regulator starts up. The reset output is
kept LOW and is only released when VCC1 has exceeded VRT1,r and after tRD1 has elapsed.
If VS < VPOR,f, an internal reset is generated and the SBC is switched OFF. The SBC will restart in INIT mode when
VS > VPOR,r rising. Timing behavior is shown in Figure 43.
VS
VPOR,r
VPOR,f
t
t
VCC1
VRT1,r
The reset threshold can be
configured via SPI in SBC
Normal Mode, default is VRT1
VRTx,f
RO
SBC Restart Mode is
entered whenever the
Reset is triggered
t
tRD1
SBC Mode
Re-
start
SBC OFF
SBC INIT MODE
Any SBC MODE
SBC OFF
t
SPI
Command
Figure 43 Ramp up/down example of supply voltage
13.4
Undervoltage VLIN
When the supply voltage VLIN reaches the undervoltage threshold (VLIN,UVD) the SBC does the following
actions:
•
The SPI bit VLIN_UV is set. No other error bits are set. The bit can be cleared once the condition is no longer
present
•
LIN is set to LIN Receive-Only mode
For additional information, please refer to Chapter 9.2.7.
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Supervision functions
13.5
Buck regulator monitoring features
13.5.1
VCC1 undervoltage
As described in Chapter 13.1, and Figure 44, a reset will be triggered (RO pulled LOW) when the VCC1 output
voltage reaches the undervoltage threshold (VRTx) and the SBC enters SBC Restart mode. The bit VCC1_UV is
set. The threshold can be configured using VCC1_RT bits.
The VCC1 undervoltage can be disabled by setting VCC1_RT to 11B. With this configuration no reset is issued
due to VCC1 undervoltage and no VCC1_UV bit is set. The under voltage detection has to be performed outside
of the SBC when required.
VCC1
VRTx
t
tRF
tRD1
RO
t
SBC Normal
SBC Restart
SBC Normal
Figure 44 VCC1 undervoltage timing diagram
Note: The VCC1_UV bit is not set in SBC Sleep and Fail-Safe mode as VCC1 is known to be 0 V in these cases.
13.5.2
VCC1 overvoltage
For fail-safe reasons, a VCC1 overvoltage detection feature is implemented. It is active in SBC Init, Normal, and
Stop mode.
If VCC1 voltage exceeds the VCC1,OV,r threshold, the SBC triggers following actions:
•
•
The bit VCC1_OV is always set
If the bit VCC1_OV_ RST is set, SBC Restart mode is entered. A reset event is generated. The SBC exits the
SBC Restart mode and SBC Normal mode is resumed after the VCC1 over voltage is not present anymore
(see also Figure 45)
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Supervision functions
VCC1
VCC1,OV
t
tOV_filt
RO
tRD1
t
SBC Normal
SBC Restart
SBC Normal
Figure 45 VCC1 overvoltage timing diagram
13.5.3
VCC1 short circuit
The short circuit protection feature for buck regulator is implemented as follows:
•
When VCC1 stays below the undervoltage threshold VRTx for more than tVCC1,SC and at the same time VS is
above the threshold VS,UV_TO, the SBC enters SBC Fail-Safe mode and turns OFF the buck regulator. The FOx
are activated and the SPI status bits VCC1_SC, VCC1_UV and BCK_SH are set. The SBC can be reactivated
by a wake event on CAN, LINx or WK
13.5.4
SMPS status register
The TLE9271QX has a dedicated SMPS status register which provides information about the buck and boost
regulators. No SBC mode changes and no transceivers configurations changes are triggered when an
SMPS_STAT register bit is set.
13.6
VCC2 undervoltage
An undervoltage warning is implemented for VCC2 as follows:
•
In case VCC2 drops below the VCC2,UV,f threshold for t > tVCC2,UV, the SPI bit VCC2_UV is set and can be only
cleared via SPI
Note: The VCC2_UV flag is not set during turn-on or turn-off of VCC..
13.7
VCAN undervoltage
The CAN module has a dedicated feature to detect undervoltage condition on the VCAN supply pin. Refer to
Chapter 8.2.7 for additional information.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Supervision functions
13.8
Thermal protection
Three independent and different thermal protection features are implemented in the SBC according to the
system impact:
•
•
•
Individual thermal shutdown of specific blocks
Temperature prewarning of buck regulator
SBC thermal shutdown due to buck regulator overtemperature
13.8.1
Individual thermal shutdown
As a first-level protection measure, the output stages VCC2, CAN and LINx are independently switched OFF
when the respective block reaches the temperature threshold TjTSD1. Then the TSD1 bit is set. This bit can only
be cleared via SPI once the overtemperature is not present anymore. Regardless of the SBC mode, the thermal
shutdown protection is only active when the respective block is ON.
The different modules behave as follows:
•
•
•
VCC2: It is switched OFF and the control bits VCC2_ON are cleared. The status bit VCC2_OT is set. Once the
over temperature condition is not present anymore, the VCC2 must be reconfigured by SPI. The thermal
protection in VCC2 is available only in SBC Normal mode or SBC Stop mode with watchdog activated
CAN: The transmitter is disabled and stays in CAN Normal mode acting like CAN Receive-Only mode. The
status bits CAN_FAIL = 01B are set. Once the overtemperature condition is not present anymore, the CAN
transmitter is automatically switched on
LIN1, LIN2: The transmitter is disabled and stays in LIN Normal mode acting like LIN Receive-Only mode.
The respective status bits LINx_FAIL are set to 01B. Once the overtemperature condition is not present
anymore, the LIN transmitter is automatically switched on
Note: The diagnosis bits are not cleared automatically and have to be cleared via SPI once the overtemperature
condition is not present anymore.
13.8.2
Temperature prewarning
As a next level of thermal protection, a temperature prewarning is implemented if the buck regulator reaches
the temperature prewarning threshold TjPW. The status bit TPW is set. This bit can only be cleared via SPI once
the overtemperature is not present anymore. Regardless of the SBC mode the temperature prewarning is
active only if the buck converter is ON.
13.8.3
SBC thermal shutdown
As a highest level of thermal protection, a temperature shutdown of the SBC occurs if the buck regulator
reaches the thermal shutdown temperature threshold TjTSD2. The temperature protection is available only in
case that the buck regulator works in PWM modulation. The thermal protection is not available if the buck
regulator works in PFM mode.
Once a TSD2 event is detected, SBC Fail-Safe mode is entered for at least tTSD2. The default wake sources (CAN,
LINx, WK pin) are enabled together with the fail-safe outputs.
When a TSD2 event is detected, the status bit TSD2 is set. This bit can only be cleared via SPI in SBC Normal
mode once the overtemperature is not present anymore. Regardless of the SBC mode the thermal shutdown
is only active if the buck converter is ON.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Supervision functions
13.9
Electrical characteristics
Table 21 Electrical specification
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; SBC Normal mode; all voltages with respect to ground; positive current
defined flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
VCC1 monitoring, reset generator; pin RO TLE9271QX
Reset threshold
voltage RT1,f
VRT1,f
VRT1,r
VRT2,f
VRT2,r
VRT3,f
4.5
4.6
3.7
3.8
3.0
4.6
4.7
3.9
4.0
3.15
4.75
4.85
4.0
V
V
V
V
V
Default setting; P_13.9.1
V
CC1 falling
Default setting; P_13.9.2
CC1 rising
Reset threshold
voltage RT1,r
V
Reset threshold
voltage RT2,f
SPI option; VCC1 P_13.9.3
falling
Reset threshold
voltage RT2,r
4.1
SPI option; VCC1 P_13.9.4
rising
Reset threshold
voltage RT3,f
3.3
SPI option;
VS ≥ 4 V;
P_13.9.5
P_13.9.6
V
CC1 falling
Reset threshold
voltage RT3,r
VRT3,r
3.1
3.25
3.4
V
SPI option;
VS ≥ 4 V;
V
CC1 rising
Reset threshold hysteresis VRT,hys
CC1 overvoltage detection VCC1,OV,r
20
100
5.4
200
5.5
mV
V
–
P_13.9.33
P_13.9.50
V
5.2
Rising VCC1
threshold
VCC1 overvoltage detection VCC1,OV,hys
20
100
200
mV
–
P_13.9.74
hysteresis
2)
2)
VCC1 short to GND filter time tVCC1,SC
–
4
–
ms
µs
V
P_13.9.11
P_13.9.58
P_13.9.13
V
CC1 overvoltage filter time tOV,filt
–
7
–
VS threshold for VCC1
undervoltage time out
detection
VS,UV_TO
5.3
5.6
6.0
VS needs to be
above to activate
VCC1_SC time-
out
Reset LOW output voltage
VRO,HIGH
–
0.2
–
0.4
V
IRO = 1 mA for
P_13.9.14
P_13.9.15
V
CC1 ≥ 1 V
Reset HIGH output voltage VRO,LOW
0.7 ×
VCC1µC + V
IRO = -20 µA
VCC1µC
0.3 V
Reset pull-up resistor
Reset filter time
RRO
tRF
10
4
20
10
40
26
kΩ
µs
VRO = 0 V
P_13.9.16
P_13.9.17
2)
V
< VRT1x
CC1
to RO = LOW
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Supervision functions
Table 21 Electrical specification (cont’d)
Tj = -40°C to +150°C; VS = 5.5 V to 28 V; SBC Normal mode; all voltages with respect to ground; positive current
defined flowing into pin (unless otherwise specified)
Parameter
Symbol
Values
Typ.
2
Unit Note or
Test Condition
Number
Min.
Max.
1)2)
Reset delay time
tRD1
1.5
2.5
ms
P_13.9.18
VCC2 monitoring
VCC2 undervoltage
threshold (falling)
VCC2,UV,f
VCC2,UV,r
VCC2,UV,hys
tVCC2,UV
4.5
4.6
20
–
–
4.75
4.9
250
–
V
VCC2 falling
VCC2 rising
P_13.9.21
P_13.9.55
P_13.9.56
P_13.9.22
VCC2 undervoltage
threshold (rising)
–
V
VCC2 undervoltage
detection hysteresis
100
7
mV
µs
–
2)
VCC2 undervoltage Filter
time
Watchdog generator
Long open window
Internal oscillator
4)
tLW
240
0.8
300
1.0
360
1.2
ms
P_13.9.34
P_13.9.24
fCLKSBC
MHz
–
Minimum waiting time during SBC Fail-Safe mode
2)3)
Min. waiting time in fail-safe tFS,min
–
100
–
ms
P_13.9.41
Power on reset, over-/undervoltage protection
VS power ON reset rising
VS power ON reset falling
VPOR,r
VPOR,f
4.5
–
–
–
5
3
V
V
VS increasing
P_13.9.25
P_13.9.26
VS decreasing
BOOST=OFF
VLINundervoltagedetection VLIN,UVD
threshold
4.8
–
–
5.5
–
V
Hysteresis
included
4)
P_13.9.27
P_13.9.57
VLINundervoltagedetection VLIN,UVD,hys
200
mV
hysteresis
Overtemperature shutdown4)
4)
Thermal prewarning ON
temperature
TjPW
125
145
165
°C
P_13.9.37
4)
4)
2)
Thermal shutdown TSD1
Thermal shutdown TSD2
TjTSD1
TjTSD2
tTSD2
165
165
–
185
185
1
200
200
–
°C
°C
s
P_13.9.38
P_13.9.39
P_13.9.40
Deactivation time after
thermal shutdown TSD2
1) The reset delay time will start when VCC1 crosses above the selected Vrtx threshold.
2) Not subject to production tests. Tolerance defined by internal oscillator tolerance.
3) This time applies for all failure entries except a device thermal shutdown (TSD2 has a 1 s waiting time tTSD2).
4) Not subject to production test, specified by design.
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
14
Serial Peripheral Interface
14.1
SPI description
The 16-bit wide Control Input Word is read via the data input SDI, which is synchronized with the clock input
CLK provided by the microcontroller. The output word appears synchronously at the data output SDO (see
Figure 46).
The transmission cycle begins when the chip is selected by the input CSN (Chip Select Not), LOW active. After
the CSN input returns from LOW to HIGH, the word that has been read is interpreted according to the content.
The SDO output switches to tristate status (HIGH impedance) at this point, thereby releasing the SDO bus for
other use.
The state of SDI is shifted into the input register with every falling edge on CLK. The state of SDO is shifted out
of the output register after every rising edge on CLK. The SPI of the SBC is not daisy chain capable.
CSN high to low: SDO is enabled. Status information transferred to output shift register
CSN
time
CSN low to high: data from shift register is transferred to output functions
CLK
time
Actual data
New data
0 1
+ +
SDI
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
time
SDI: will accept data on the falling edge of CLK signal
Actual status
New status
0
1
+
ERR
SDO
ERR
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
-
+
time
SDO: will change state on the rising edge of CLK signal
Figure 46 SPI data transfer timing (note the reversed order of LSB and MSB shown in this figure
compared to the register description)
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
14.2
Failure signalization in the SPI data output
When the microcontroller sends a wrong SPI command to the SBC, the SBC ignores the information. Wrong
SPI commands can be either an invalid control command requesting to go to an SBC mode which is not
allowed by the state machine, for example from SBC Stop mode to SBC Sleep mode. In this case the diagnosis
bit ‘SPI_FAIL’ is set. This bit can be only reset by actively clearing it using an SPI command.
Invalid SPI commands are listed below:
•
•
•
Illegal state transitions:
Going from SBC Stop to SBC Sleep mode. In this case, the SBC enters in addition the SBC Restart mode.
Trying to go to SBC Stop or SBC Sleep mode from SBC Init mode. In this case, the SBC enters
SBC Normal mode
Attempting to change the watchdog settings during Stop mode ;.
Only WD trigger, returning to SBC Normal mode, select Software Reset, set to SBC Stop mode to return
from PWM to PFM when automatic buck mode transition has happened and read and clear commands are
valid SPI commands in SBC Stop mode
Attempt to go to Sleep mode when all bits in the BUS_CTRL_1 and WK_CTRL_2 registers are cleared. In
this case, the SPI_FAIL bit is set and the SBC enters Restart mode.
Note that at least one wake source must be activated in order to avoid a deadlock situation in Sleep mode,
i.e. the SBC would not be able to wake up anymore. There is no signalling or failure handling for the
attempt to go to SBC Stop mode when all bits in the registers BUS_CTRL_1 and WK_CTRL_2 are cleared
because the microcontroller can leave this mode via SPI
Signalization of the ERR flag in the SPI data output (see Figure 46):
In addition, the number of received input clocks is supervised to be 0- or 16 clock cycles and the input word is
discarded in case of a mismatch (0 clock cycle to enable ERR signalization). Both errors - 0 bit and 16 bit CLK
mismatch or CLK high during CSN edges - are flagged in the following SPI output by a HIGH at the data output
(SDO pin, bit ERR) before the first rising edge of the clock is received. The error logic also recognizes if CLK was
HIGH during CSN edges. The complete SPI command is ignored in these cases.
Note: It is also possible (no ERR flag is set) to quickly check for the ERR flag without sending any data bits. i.e. no
SPI clocks are sent in this case.
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
14.3
SPI programming
For the TLE9271QX, 7 bits are used for the address selection (6...0). Bit 7 is used to decide between Read_Only
and Read_Clear for the status bits, and between Write and Read Only for configuration bits. For the actual
configuration and status information, 8 data bits (BIT15...8) are used.
Writing, clearing and reading is done byte wise. SPI configuration and status bits are not cleared automatically
and must be cleared by the microcontroller, e.g. if the TSD2 was set due to overtemperature. The
configuration bits will be partially automatically cleared by the SBC - please refer to the individual registers
description for detailed information. During SBC Restart mode or Sleep mode or Fail-Safe mode, the SPI
communication is ignored by the SBC, i.e. it is not interpreted.
There are two types of SPI registers:
•
•
Control registers: The registers used to configure the SBC, e.g. SBC mode, watchdog trigger, etc.
Status registers: The registers used to signal the status of the SBC, e.g. wake-up events, warnings, failures,
etc.
For the status registers, the requested information is given in the same SPI command in DO.
For the control registers, the status of the respective bit is also shown in the same SPI command, but if the
setting is changed this is only shown with the next SPI command (it is only valid after CSN HIGH) of the same
register.
The SBC status information from the SPI status registers is transmitted in a compressed format with each SPI
response on SDO in the so-called Status Information Field register (see also Figure 47). The purpose of this
register is to quickly signal the information to the microcontroller if there was a change in one of the SPI status
registers. In this way, the microcontroller does not need to constantly read all the SPI status registers but only
those registers that have changed. Each bit in the Status Information Field represents an SPI status register
(see Table 22). As soon as one bit is set in one of the status registers, the respective bit in the Status
Information Field register is set. The register WK_LVL_STAT is not included in the status Information field. This
is shown in Table 22.
For example, if bit 0 in the Status Information Field is set to 1, one or more bits of the register 100 0001
(SUP_STAT) are set to 1. Then this register needs to be read in a second SPI command. The bit in the Status
Information Field will be set to 0 when all bits in the register 100 0001 are set back to 0.
Table 22 Status information field
Status
Symbol
Status register
information bit address bit
0
1
2
3
4
5
6
7
100 0001
100 0010
100 0011
100 0100
100 0101
100 0110
100 0111
100 1100
SUP_STAT: Supply status - VS fail, VCCx fail, POR
THERM_STAT: Thermal protection status
DEV_STAT: Device status - mode before wake, WD fail, SPI fail, failure
BUS_STAT_1: Bus failure status: CAN, LIN
BUS_STAT_2: Bus failure status: CAN, LIN
WK_STAT_1: Wake source status
WK_STAT_2: Wake source status
SMPS_STAT: SMPS status
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
LSB
MSB
DI
0
1
2
3
4
5
6
7
8
x
9
x
10 11 12 13 14 15
R/W
Address Bits
Data Bits
x
x
x
x
x
x
Register content of
selected address
DO
0
1
2
3
4
5
6
7
8
x
9
x
10 11 12 13 14 15
Data Bits
Status Information Field
x
x
x
x
x
x
time
LSB is sent first in SPI message
Figure 47 SPI operation mode
14.4
SPI bit mapping
Figure 48 and show the mapping of the SPI bits and the respective registers.
The control registers ‘000 0001’ to ‘001 1110’ are READ/WRITE register. Depending on bit 7 the bits are only
read or also written. The new setting of the bit after write can be seen with a new read / write command.
The registers ‘100 0001’ to ‘111 1110’ are Status Registers and can be read or read with clearing the bit (if
possible) depending on bit 7. To clear a data byte of one of the Status Registers, bit 7 must be set to 1. The
register WK_LVL_STAT is an exception as it shows the actual voltage level at the respective WK pin
(LOW/HIGH) and can thus not be cleared.
When changing to a different SBC mode, certain configurations and status bits will be cleared:
•
•
The SBC mode bits are updated to the actual status, e.g. when returning to Normal mode
In Sleep mode, the CAN and LIN control bits will be changed to CAN/LIN wake capable if they were ON
before. FOx will stay activated if it was triggered before
•
•
VCC2 can be active in Low power mode (Stop/Sleep). The configuration can only be done in Normal mode.
Diagnosis is active (UV, OT)
Depending on the respective configuration, CAN/LIN transceivers will be either OFF, woken or still wake
capable
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
7
6...0
Register Short Name
Address
A6…A0
Read-Only (1)
C O N T R O L R E G I S T E R S
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
0000001
0000010
0000011
0000100
0000101
0000110
0000111
0001000
0001100
0011110
M_S_CTRL
HW_CTRL
WD_CTRL
BUS_CTRL_1
BUS_CTRL_2
WK_CTRL_1
WK_CTRL_2
WK_PUPD_CTRL
TIMER1_CTRL
SYS_STATUS_CTRL
S T A T U S R E G I S T E R S
read/clear
read/clear
read/clear
read/clear
read/clear
read/clear
read/clear
read
1000001
1000010
1000011
1000100
1000101
1000110
1000111
1001000
1001100
1111110
SUP_STAT
THERM_STAT
DEV_STAT
BUS_STAT_1
BUS_STAT_2
WK_STAT_1
WK_STAT_2
WK_LVL_STAT
SMPS_STAT
FAM_PROD_STAT
read/clear
read
Figure 48 SPI bit mapping
15
14
13
12
11
10
9
8
7
6...0
Data Bit 15…8
D4
Register Short Name
Address
A6…A0
Read-Only (1)
D7
D6
D5
D3
D2
D1
D0
C O N T R O L R E G I S T E R S
M_S_CTRL
HW_CTRL
WD_CTRL
BUS_CTRL_1
BUS_CTRL_2
WK_CTRL_1
MODE_1
FSI_FO2
CHECKSUM
LIN_FLASH
reserved
reserved
reserved
reserved
reserved
MODE_0
PWM_TLAG
WD_STM_EN_0
LIN_LSM
reserved
TIMER1_WK_EN
reserved
reserved
reserved
SYS_STAT_6
reserved
FO_ON
WD_WIN
LIN_TXD_TO
reserved
reserved
reserved
reserved
reserved
VCC2_ON_1
PWM_BY_WK
WD_EN_WK_BUS
LIN1_1
reserved
reserved
reserved
reserved
reserved
SYS_STAT_4
VCC2_ON_0
PWM_AUTO
MAX_3_RST
LIN1_0
reserved
reserved
reserved
reserved
reserved
SYS_STAT_3
VCC1_OV_RST
BOOST_V
WD_TIMER_2
reserved
reserved
WD_STM_EN_1
reserved
VCC1_RT_1
BOOST_EN
WD_TIMER_1
CAN_1
LIN2_1
reserved
VCC1_RT_0
CFG2
WD_TIMER_0
CAN_0
LIN2_0
reserved
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
0000001
0000010
0000011
0000100
0000101
0000110
0000111
0001000
0001100
0011110
WK_CTRL_2
reserved
WK_PUPD_1
WK_EN
WK_PUPD_0
WK_PUPD_CTRL
TIMER1_CTRL
SYS_STATUS_CTRL
reserved
TIMER1_PER_2 TIMER1_PER_1 TIMER1_PER_0
SYS_STAT_2
SYS_STAT_7
SYS_STAT_5
SYS_STAT_1
SYS_STAT_0
S T A T U S R E G I S T E R S
SUP_STAT
THERM_STAT
DEV_STAT
BUS_STAT_1
BUS_STAT_2
WK_STAT_1
WK_STAT_2
WK_LVL_STAT
SMPS_STAT
POR
reserved
DEV_STAT_1
reserved
reserved
PFM_PWM
reserved
TEST
VLIN_UV
reserved
DEV_STAT_0
LIN1_FAIL_1
reserved
reserved
reserved
reserved
BST_SH
VCC1_OV
reserved
RO_CL_HIGH
LIN1_FAIL_0
reserved
CAN_WU
reserved
CFG2_STATE
BST_OP
VCC2_OT
reserved
FSI_FAIL
reserved
reserved
TIMER_WU
reserved
reserved
BST_GSH
FAM_0
VCC2_UV
reserved
WD_FAIL_1
reserved
reserved
reserved
reserved
reserved
reserved
PROD_3
VCC1_SC
TSD2
WD_FAIL_0
CAN_FAIL_1
LIN2_FAIL_1
reserved
reserved
reserved
BCK_SH
PROD_2
reserved
TSD1
SPI_FAIL
CAN_FAIL_0
LIN2_FAIL_0
reserved
LIN2_WU
reserved
BCK_OP
PROD_1
VCC1_UV
TPW
read/clear
read/clear
read/clear
read/clear
read/clear
read/clear
read/clear
read
1000001
1000010
1000011
1000100
1000101
1000110
1000111
1001000
1001100
1111110
FO_ON_STATE
VCAN_UV
reserved
WK_WU
LIN1_WU
WK
BST_ACT
FAM_3
BCK_OOR
PROD_0
read/clear
read
FAM_PROD_STAT
FAM_2
FAM_1
Figure 49 Detailed SPI bit mapping
Datasheet
100
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
14.5
SPI control registers
Read-/write operation (see Chapter 14.3):
•
•
•
The ‘POR / Soft Reset Value’ defines the register content after POR or SBC Reset
The ‘Restart Value’ defines the register content after SBC Restart, where ‘x’ means the bit is unchanged
One 16-bit SPI command consist of two bytes:
–
–
The 7-bit address and one additional bit for the register access mode and
Following the data byte
The numbering of following bit definitions refers to the data byte and correspond to the bits D0...D7 and
to the SPI bits 8...15 (see also Figure 49)
•
There are three different bit types:
–
–
–
‘r’ = READ; read-only bits (or reserved bits)
‘rw’ = READ/WRITE; readable and writable bits
‘rwh’ = READ/WRITE/HARDWARE; as rw with the possibility that the hardware can change the bits
•
•
•
Reading a register is done byte wise by setting the SPI bit 7 to “0” (= read-only)
Writing to a register is done byte wise by setting the SPI bit 7 to “1”
SPI control bits are in general not cleared or changed automatically. This must be done by the
microcontroller via SPI programming
M_S_CTRL
Mode- and supply control (Address 000 0001B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0000 0xxxB
7
6
5
4
3
2
1
0
VCC1_OV_
RST
MODE_1
MODE_0
Reserved
VCC2_ON_1 VCC2_ON_0
VCC1_RT_1 VCC1_RT_0
R
rw
rw
r
rw
rw
rw
rw
rw
Field
Bits
Type
Description
MODE
7:6
rw
SBC mode control
00B , SBC Normal mode
01B , SBC Sleep mode
10B , SBC Stop mode
11B , SBC Reset: Soft reset is executed (RO is not triggered)
Reserved
VCC2_ON
5
r
Reserved, always reads as 0
4:3
rw
VCC2 mode control
00B , VCC2 OFF
01B , VCC2 ON in Normal mode
10B , VCC2 ON in Normal and Stop mode
11B , VCC2 ON in Normal, Stop and Sleep mode
VCC1_OV_
RST
2
rw
VCC1 overvoltage reset enable
0B
1B
, Overvoltage on VCC1 will not trigger a reset
, Overvoltage on VCC1 will trigger a reset, SBC goes to SBC
Restart mode
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
Type
Description
VCC1_RT
1:0
rw
VCC1 reset threshold control
00B , Vrt1 selected (highest threshold)
01B , Vrt2 selected
10B , Vrt3 selected
11B , Undervoltage Reset disabled
Note: Trying to enter SBC Sleep mode without any of the wake sources enabled will result in entering SBC
Restart mode and triggering a Reset.
HW_CTRL
Hardware control (Address 000 0010B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: xx0x xxxxB
7
6
5
4
3
2
1
0
FSI_FO2
PWM_TLAG
FO_ON
PWM_BY_WK PWM_AUTO
BOOST_V
BOOST_EN
CFG2
R
rw
rw
rw
rw
rw
rw
rw
rw
Field
Bits
Type
Description
FSI_FO2
PWM_TLAG
FO_ON
7
rw
rw
rw
Failure safe input activation
This bit is used to activate the fail-safe input by software.
0B
1B
, FSI active
, FSI disable. The pin is set as output (FO2)
6
5
PWM lag time
This bit permits to set the time between the PWM to PFM transition.
0B
1B
, 100 µs
, 1 ms
Failure outputs activation
This bit is used to activate the fail outputs by software.
0B
, FOx not activated by software, FOx can be activated by
defined failure
1B
, FOx activated by software
PWM_BY_
WK
4
3
rw
rw
PWM of buck converter enabled by WK pin in SBC Stop mode
0B
1B
, Buck converter uses PFM in Stop mode
, Buck converter can be switched between PFM and PWM by
the level of the WK pin in SBC Stop mode
PWM_AUTO
Automatic transition PFM-PWM in SBC Stop mode
This bit is used to activate the automatic transition PFM to PWM in
SBC Stop mode.
0B
1B
, Buck converter always uses PFM in SBC Stop mode
, Buck converter uses automatic transition PFM to PWM in
case large current needed in SBC Stop mode. To come back
in PFM, write a SBC Stop mode command to M_S_CTRL
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
Type
Description
BOOST_V
2
rw
Boost voltage selection
0B
1B
, Boost voltage 8 V typical
, Boost voltage 6.65 V typical
BOOST_EN
CFG2
1
0
rw
rw
Boost converter enable
0B
1B
, Boost off
, Boost enabled, automatic switch ON for VS voltage lower
than VBST,THx
Configuration select 2
0B
, Fail outputs (FOx) are active after 2nd watchdog trigger fail
Config 3
1B
, Fail outputs (FOx) are active after 1st watchdog trigger fail
Config 1
Note: The selection between Config 1 respectively Config 3 is done by the pin CFG. The CFG pin defines if the SBC
goes to Fail-Safe mode with VCC1 OFF in case of a watchdog failure.
WD_CTRL
Watchdog control (Address 000 0011B)
POR / Soft Reset Value: 0001 0100B;
Restart Value: x00x x100B
7
6
5
4
3
2
1
0
WD_STM_
EN_0
WD_EN_WK_
BUS
CHECKSUM
WD_WIN
MAX_3_RST WD_TIMER_2 WD_TIMER_1 WD_TIMER_0
r
w
rwh
rw
rwh
rw
rwh
rwh
rwh
Field
Bits
Type
Description
CHECKSUM
7
w
Checksum bit
The sum of bit 7...0 needs to be even. Otherwise the bit SPI_FAIL is
set and the command ignored.
This bit will always read as ‘0’.
0B
1B
, Counts as 0 for checksum calculation
, Counts as 1 for checksum calculation
WD_STM_
EN_0
6
5
4
rwh
rw
Watchdog activation during SBC Stop mode
0B
1B
, Watchdog is active in SBC Stop mode
, Watchdog is deactivated in SBC Stop mode
WD_WIN
Watchdog window time-out feature enabled
0B
1B
, Watchdog works as time-out Watchdog
, Watchdog works as Window Watchdog
WD_EN_WK
_BUS
rwh
Enable the watchdog after transceiver (CAN/LIN) wake-up in
SBC Stop mode
0B
1B
, Watchdog will not start after a CAN/LIN1/LIN2/ wake
, Watchdog starts with a long open window after
CAN/LIN1/LIN2 wake
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
Type
Description
MAX_3_RST
3
rw
Limit number of resets due to a watchdog failure
0B
1B
, Always generate a reset in case of WD fail
, After 3 consecutive resets due to WD fail, no further reset is
generated
WD_TIMER 2:0
rwh
Watchdog timer period
000B , 10 ms
001B , 20 ms
010B , 50 ms
011B , 100 ms
100B , 200 ms
101B , 500 ms
110B , 1s
111B , reserved
Note: See also Chapter 13.2.4 for more information on disabling the watchdog SBC Stop mode.
BUS_CTRL_1
Bus control (Address 000 0100B)
POR / Soft Reset Value: 0010 0000B;
Restart Value: xxxx x0xxB
7
6
5
4
3
2
1
0
LIN_FLASH
LIN_LSM
LIN_TXD_TO
LIN1_1
LIN1_0
reserved
CAN_1
CAN_0
r
rw
rw
rw
rwh
rwh
r
rwh
rwh
Field
Bits
Type
Description
LIN_FLASH
7
rw
LIN flash programming mode
0B
1B
, Slope control mechanism active
, Deactivation of slope control for baud rates up to 115 kBaud
LIN_LSM
6
rw
LIN LOW-slope mode selection
0B
1B
, LIN Normal-slope mode is activated
, LIN Low-slope mode is activated
LIN_TXD_
TO
5
rw
LIN TXD time-out control
0B
1B
, TXDLIN time-out feature disabled
, TXDLIN time-out feature enabled
LIN1
4:3
rwh
LIN module mode
00B , LIN1 OFF
01B , LIN1 is wake capable
10B , LIN1 Receive-Only mode
11B , LIN1 Normal mode
Reserved
2
r
Reserved, always reads as 0
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
CAN
Bits
Type
Description
1:0
rwh
HS-CAN module mode
00B , CAN OFF
01B , CAN is wake capable
10B , CAN Receive-Only mode
11B , CAN Normal mode
Note: In case CAN transceiver is configured to ‘11’ while going to SBC Stop or Sleep mode, it will be
automatically set to wake capable (‘01’). However, the SPI bits will stay unchanged, i.e. once the SBC
returns to Normal mode, the previous state is recovered again (‘11’). The Receive-Only mode (‘10’) has to
be selected by purpose before entering SBC Stop mode. For more details, refer to Figure 18.
In case of entering SBC Sleep mode, the CAN transceiver has to be set to CAN wake capable or CAN OFF
mode before.
In case LIN transceiver is configured to ‘11’ while going to SBC Stop or Sleep mode, it will be automatically
set to wake capable (‘01’). However, the SPI bits will stay unchanged, i.e. once the SBC returns to Normal
mode, the previous state is recovered again (‘11’).The Receive-Only mode (‘10’) has to be selected by
purpose before entering SBC Stop mode. For more details, refer to Figure 25.
BUS_CTRL_2
Bus control (Address 000 0101B)
POR / Soft Reset Value: 0000 0000B; Restart Value: 0000 00xxB
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
reserved
LIN2_1
LIN2_0
r
r
r
r
r
r
r
rwh
rwh
Field
Bits
Type
Description
Reserved
LIN2
7:2
1:0
r
Reserved, always reads as 0
rwh
LIN module mode
00B , LIN2 OFF
01B , LIN2 is wake capable
10B , LIN2 Receive-Only mode
11B , LIN2 Normal mode
Note: In case either LIN transceiver is configured to ‘11’ while going to SBC Stop or Sleep mode, it will be
automatically set to wake capable (‘01’). However, the SPI bits will stay unchanged, i.e. once the SBC
returns to Normal mode, the previous state is recovered again (‘11’). The Receive-Only mode (‘10’) has to
be selected by purpose before entering SBC Stop mode. For more details, refer to Figure 25.
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
WK_CTRL_1
Wake input control (Address 000 0110B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0x00 0000B
7
6
5
4
3
2
1
0
TIMER1_WK_
EN
WD_STM_
EN_1
reserved
reserved
reserved
reserved
reserved
reserved
r
r
rw
r
r
r
rwh
r
r
Field
Reserved
Bits
Type
Description
7
r
Reserved, always reads as 0
TIMER1_WK 6
rw
Timer1 wake source control
_EN
0B
1B
, Timer1 wake disabled
, Timer1 is enabled as a wake source
Reserved
5:3
r
Reserved, always reads as 0
WD_STM_
EN_1
2
rwh
Watchdog activation during SBC Stop mode
0B
1B
, Watchdog is active in Stop mode
, Watchdog is deactivated in Stop mode
Reserved
1:0
r
Reserved, always reads as 0
WK_CTRL_2
Wake source control (Address 000 0111B)
POR / Soft Reset Value: 0000 0001B; Restart Value: 0000 000xB
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
reserved
reserved
WK_EN
r
r
r
r
r
r
r
r
rw
Field
Bits
Type
Description
Reserved
WK_EN
7:1
0
r
Reserved, always reads as 0
WK wake source control
rw
0B
1B
, WK wake disabled
, WK is enabled as a wake source
WK_PUPD_CTRL
Wake input level control (Address 000 1000B)
POR / Soft Reset Value: 0000 0000B; Restart Value: 0000 00xxB
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
reserved
WK_PUPD_1 WK_PUPD_0
r
r
r
r
r
r
r
rw
rw
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
7:2
Type
r
Description
Reserved
WK_PUPD
Reserved, always reads as 0
1:0
rw
WK pull-up/pull-down configuration
00B , No pull-up/pull-down selected
01B , Pull-down resistor selected
10B , Pull-up resistor selected
11B , Automatic switching to pull-up or pull-down
TIMER1_CTRL
Timer1 control and selection (Address 000 1100B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0000 0xxxB
7
6
5
4
3
2
1
0
TIMER1_PER TIMER1_PER TIMER1_PER
reserved
reserved
reserved
reserved
reserved
_2
_1
_0
r
r
r
r
r
r
rw
rw
rw
Field
Reserved
Bits
7:3
Type
Description
r
Reserved, always reads as 0
TIMER1_PE 2:0
R
rw
Timer1 period configuration
000B , 10 ms
001B , 20 ms
010B , 50 ms
011B , 100 ms
100B , 200 ms
101B , 1 s
110B , 2 s
111B , reserved
SYS_STATUS_CTRL
System status control (Address 001 1110B)
POR Value: 0000 0000B;
Restart Value/Soft Reset Value: xxxx xxxxB
7
6
5
4
3
2
1
0
SYS_STAT_7 SYS_STAT_6 SYS_STAT_5 SYS_STAT_4 SYS_STAT_3 SYS_STAT_2 SYS_STAT_1 SYS_STAT_0
r
rw
rw
rw
rw
rw
rw
rw
rw
Field
Bits
Type
rw
Description
SYS_STAT
7:0
System status control byte (bit0=LSB; bit7=MSB)
Dedicated byte for system configuration, access only by
microcontroller. No SBC functions
Datasheet
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Notes
1. The SYS_STATUS_CTRL register is an exception for the default values, i.e. it will keep its configured value
even after a Soft Reset.
2. This byte is intended for storing system configurations of the ECU by the microcontroller and it is writable in
SBC Normal and Stop mode. The byte is not accessible by the SBC and is also not cleared after Fail-Safe or
SBC Restart mode. It allows the microcontroller to quickly store system configuration without losing the data.
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
14.6
SPI status information registers
Read-/write operation (see Chapter 14.3):
•
One 16-bit SPI command consists of two bytes:
–
–
The 7-bit address and one additional bit for the register access mode and
Following the data byte will be ignored when accessing a status register
The numbering of following bit definitions refers to the data byte and correspond to the bits D0...D7 and
to the SPI bits 8...15 (see also )
•
There are two different bit types:
–
–
‘r’ = READ: read-only bits (or reserved bits)
‘rc’ = READ/CLEAR: readable and clearable bits
•
•
•
Reading a register is done byte wise by setting the SPI bit 7 to “0” (= read-only)
Clearing a register is done byte wise by setting the SPI bit 7 to “1”
SPI status registers are in general not cleared or changed automatically (an exception are the WD_FAIL
bits). This must be done by the microcontroller via SPI command
SUP_STAT
Supply voltage fail status (Address 100 0001B)
POR / Soft Reset Value: x000 0000B;
Restart Value: xxxx xx0xB
7
6
5
4
3
2
1
0
POR
VLIN_UV
VCC1_OV
VCC2_OT
VCC2_UV
VCC1_SC
reserved
VCC1_UV
r
rc
rc
rc
rc
rc
rc
r
rc
Field
Bits
Type
Description
POR
7
6
5
4
3
rc
rc
rc
rc
rc
Power-on-reset detection
0B
1B
, No POR
, POR occurred
VLIN_UV
VCC1_OV
VCC2_OT
VCC2_UV
VLIN undervoltage detection
0B
1B
, No VLIN undervoltage
, VLIN undervoltage detected
VCC1 overvoltage detection
0B
1B
, No VCC1 overvoltage
, VCC1 overvoltage detected
VCC2 overtemperature detection
0B
1B
, No overtemperature
, VCC2 overtemperature detected
VCC2 undervoltage detection
0B
1B
, No VCC2 undervoltage
, VCC2 undervoltage detected
Datasheet
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Rev.2.0
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
Type
Description
VCC1_SC
2
rc
VCC1 short to GND detection
0B
1B
, No short
, VCC1 short to GND detected
Reserved
VCC1_UV
1
0
r
Reserved, always reads 0
rc
VCC1 undervoltage detection
0B
1B
, No VCC1 undervoltage
, VCC1 undervoltage detected
Notes
1. When VCC1 is OFF (for example in SBC Sleep mode), the bits VCC1_SC and VCC1_UV will not be set.
2. When VCC2 is OFF, the bit VCC2_UV and VCC2_OT will not be set.
3. When all LIN’s are wake capable or OFF, VLIN_UV will not be set.
THERM_STAT
Thermal protection status (Address 100 0010B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0000 0xxxB
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
TSD2
TSD1
TPW
r
r
r
r
r
r
rc
rc
rc
Field
Bits
Type
Description
Reserved
TSD2
7:3
2
r
Reserved, always reads as 0
rc
TSD2 thermal shutdown detection
0B
1B
, No TSD2 fail
, TSD2 thermal shutdown detected (leading to SBC Fail-Safe
mode)
TSD1
TPW
1
0
rc
rc
TSD1 thermal shutdown detection
0B
1B
, No TSD1 fail
, TSD1 thermal shutdown detected
Thermal prewarning
0B
1B
, No thermal prewarning
, Thermal prewarning detected
DEV_STAT
Device information status (Address 100 0011B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: xxxx xxxxB
7
6
5
4
3
2
1
0
FO_ON_
STATE
DEV_STAT_1 DEV_STAT_0 RO_CL_HIGH FSI_FAIL
WD_FAIL_1 WD_FAIL_0
rh rh
SPI_FAIL
r
rc
rc
rc
rc
rc
rc
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
Type
Description
DEV_STAT 7:6
rc
Device status before Restart mode
00B , Cleared (register must be actively cleared)
01B , Restart after failures (WD fail, TSD2, VCC1_UV and
VCC1_OV); also wake from SBC Fail-Safe mode
10B , Wake from Sleep mode
11B , Not used
RO_CL_HIG
H
5
rc
rc
rh
Reset PIN clamped to HIGH level detected
0B
1B
, No Reset Clamped to HIGH detected
, Reset Clamped to HIGH detected
FSI_FAIL
WD_FAIL
4
FSI fail information
0B
1B
, No FSI fail
, Failure on FSI pattern recognized
3:2
Number of WD-fail event
00B , No WD-fail
01B , 1x WD-fail, causing SBC activates FOx in Config1
10B , 2x WD-fails, causing SBC activates FOx in Config3
11B , Reserved (never achieved)
SPI_FAIL
1
rc
rc
SPI fail information
0B
1B
, No SPI fail
, Invalid SPI command detected, SPI command is not
executed
FO_ON_STA 0
Fail outputs on status
TE
0B
1B
, FO outputs are not activated
, FO outputs are activated
Notes
1. The bits DEV_STAT show the status of the device before it went through Restart. Either the device came from
regular Sleep mode (‘10’) or a failure (‘01’ - SBC Restart or SBC Fail-Safe mode: WD fail, TSD2 fail, VCC1_UV fail
or VCC1_OV if bit VCC1_OV_ RST is set) occurred.
2. The WD_FAIL bits are configured as a counter and are the only status bits which are cleared automatically by
the SBC. They are cleared after a successful watchdog trigger. See also Chapter 12.1.
3. The SPI_FAIL bit is cleared only by SPI command.
BUS_STAT_1
Bus communication status (Address 100 0100B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0xx0 0xxxB
7
6
5
4
3
2
1
0
reserved
LIN1_FAIL_1 LIN1_FAIL_0
rc rc
reserved
reserved
CAN_FAIL_1 CAN_FAIL_0
VCAN_UV
r
r
r
r
rc
rc
rc
Datasheet
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
7
Type
Description
Reserved
LIN1_FAIL
r
Reserved, always reads as 0
6:5
rc
LIN failure status
00B , No error
01B , LIN TSD shutdown, also TSD1 is signaled
10B , LIN_TXD_DOM: TXDLIN dominant time out
11B , LIN_BUS_DOM: BUS dominant time out
Reserved
CAN_FAIL
4:3
2:1
r
Reserved, always reads as 0
rc
CAN failure status
00B , No error
01B , CAN TSD shutdown, also TSD1 signaled
10B , CAN_TXD_DOM: TXDCAN dominant time out
11B , CAN_BUS_DOM: BUS dominant time out
VCAN_UV
Notes
0
rc
Undervoltage VCAN supply
0B
1B
, Normal operation
, VCAN supply undervoltage detected. Transmitter disabled
1. CAN and LIN recovery conditions:
1.) TXD Time Out: TXD goes HIGH or transmitter is set to wake capable or switched off.
2.) Bus dominant time out: Bus will become recessive or transceiver is set to wake capable or switched off.
3.) Supply undervoltage: as soon as the threshold is crossed again, i.e. VLIN > VS_UV for LIN and VCAN >
VCAN_UV for CAN.
4.) In all cases (also for TSD shutdown): to enable the bus transmission again, TXD needs to be HIGH for a
certain time (transmitter enable time).
2. The VCAN_UV comparator is enabled if the CAN is CAN Normal mode or CAN Receive-Only mode or CAN Wake
Capable after one valid WUP is detected.
BUS_STAT_2
Bus communication status (Address 100 0101B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0000 0xx0B
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
LIN2_FAIL_1 LIN2_FAIL_0
reserved
r
r
r
r
r
r
rc
rc
r
Field
Bits
7:3
Type
Description
Reserved
r
Reserved, always reads as 0
Datasheet
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OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
Bits
Type
Description
LIN2_FAIL
2:1
rc
LIN failure status
00B , No error
01B , LIN TSD shutdown, also TSD1 signaled
10B , LIN_TXD_DOM: TXDLIN dominant time out
11B , LIN_BUS_DOM: BUS dominant time out
Reserved
Notes
0
r
Reserved, always reads as 0
1. LIN recovery conditions:
1.) TXD Time Out: TXD goes HIGH or transmitter is set to wake capable or switched off.
2.) Bus dominant time out: Bus will become recessive or transceiver is set to wake capable or switched off.
3.) Supply undervoltage: as soon as the threshold is crossed again, i.e. VLIN > VS_UV.
4.) In all cases (also for TSD shutdown): to enable the bus transmission again, TXD needs to be HIGH for a
certain time (transmitter enable time).
WK_STAT_1
Wake-up source and information status (Address 100 0110B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: x0xx 000xB
7
6
5
4
3
2
1
0
PFM_PWM
reserved
CAN_WU
TIMER_WU
reserved
reserved
reserved
WK_WU
r
rc
r
rc
rc
r
r
r
rc
Field
Bits
Type
Description
PFM_PWM
7
rc
PFM_PWM automatic transition detected
0B
1B
, No automatic PFM_PWM transition detected
, Automatic PFM_PWM transition detected
Reserved
CAN_WU
6
5
r
Reserved, always reads as 0
rc
Wake up via CAN bus
0B
1B
, No Wake up
, Wake up
TIMER_WU
4
rc
Wake up via timer
0B
1B
, No Wake up
, Wake up
Reserved
WK_WU
3:1
0
r
Reserved, always reads as 0
Wake up via WK
rc
0B
1B
, No Wake up
, Wake up
Datasheet
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Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
WK_STAT_2
Wake-up source and information status (Address 100 0111B)
POR / Soft Reset Value: 0000 0000B;
Restart Value: 0000 xxxxB
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
reserved
LIN2_WU
LIN1_WU
r
r
r
r
r
r
r
rc
rc
Field
Bits
Type
Description
Reserved
LIN2_WU
7:2
1
r
Reserved, always reads as 0
rc
Wake up via LIN2 bus
0B
1B
, No Wake up
, Wake up
LIN1_WU
0
rc
Wake up via LIN1 bus
0B
1B
, No Wake up
, Wake up
WK_LVL_STAT
WK input level (Address 100 1000B)
POR / Soft Reset Value: x100 000xB;
Restart Value: x1x0 000xB
7
6
5
4
3
2
1
0
TEST
reserved CFG2_STATE reserved
reserved
reserved
reserved
WK
r
r
r
r
r
r
r
r
r
Field
Bits
Type
Description
TEST
7
r
Status of TEST pin
0B
1B
, LOW Level (= 0)
, HIGH Level (= 1), SBC Development mode is enabled, No
reset triggered due to wrong watchdog trigger
reserved
6
5
r
r
Reserved, always reads as 1
CFG2_
STATE
Status of CFG2 bit on HW_CTRL register
This bit shows the setting in bit CFG2.
0B
1B
, LOW Level; Fail outputs (FOx) are active after 2nd watchdog
trigger fail Config 3
, HIGH Level; Fail outputs (FOx) are active after 1st watchdog
trigger fail Config 1
Reserved
WK
4:1
0
r
r
Reserved, always reads as 0
Status of WK
0B
1B
, LOW Level (= 0)
, HIGH Level (= 1)
Datasheet
114
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
SMPS_STAT
SMPS state (Address 100 1100B)
POR / Soft Reset Value: 0000 0xxxB;
Restart Value: xxxx 0xxxB
7
6
5
4
3
2
1
0
BST_ACT
BST_SH
BST_OP
BST_GSH
reserved
BCK_SH
BCK_OP
BCK_OOR
r
rc
rc
rc
rc
r
rc
rc
rc
Field
Bits
Type
Description
BST_ACT
BST_SH
BST_OP
7
6
5
rc
rc
rc
Boost regulator active
0B
1B
, Boost not active
, Boost active
BSTD and SNSP short detection
0B
1B
, No short detected on BSTD and SNSP pins
, BSTD or SNSP pins short to GND
BSTD, SNSP SNSN open detection
0B
1B
, No open detection in BSTD, SNSP and SNSN pins
, Or operation between: BSTD loss of diode detected, SNSP
loss of resistor detected, SNSN loss of GND detected
BST_GSH
4
rc
BSTG pin short detection
0B
1B
, BSTG no short detected
, BSTG short detected to GND or internal supply
Reserved
BCK_SH
3
2
r
Reserved, always reads as 0
BCKSW pin short detection
rc
0B
1B
, No short detected
, Short to GND or short to VS detected on BCKSW pin
BCK_OP
1
0
rc
rc
BCKSW pin open detection
0B
1B
, No BCKSW open detected
, BCKSW open detected
BCK_OOR
VCC1 out-of-range
0B
1B
, VCC1 inside VCC1,out1 ±12%
, VCC1 outside ±12%
FAM_PROD_STAT
SWK Data0 register (Address 111 1110B)
POR / Soft Reset Value: 0010 xxxxB;
Restart Value: 0010 xxxxB
7
6
5
4
3
2
1
0
FAM_3
FAM_2
FAM_1
FAM_0
PROD_3
PROD_2
PROD_1
PROD_0
r
r
r
r
r
r
r
r
r
Datasheet
115
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Field
FAM
Bits
Type
Description
7:4
r
Family of products
0010B , TLE927x Family, High End SBC
PROD
3:0
r
Product variant
0100B , LIN1/2 available, VCC1 = 5 V
0101B , LIN1/2 available, VCC1 = 3.3 V
1000B , LIN1-3 available, VCC1 = 5 V
1001B , LIN1-3 available, VCC1 = 3.3 V
1100B , LIN1-4 available, VCC1 = 5 V
1101B , LIN1-4 available, VCC1 = 3.3 V
Datasheet
116
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
14.7
Electrical characteristics
Table 23 Electrical characteristics: power stage
Tj = -40°C to +150°C, VS = 5.5 V to 28 V, all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
Unit Note or
Test Condition
Number
Min.
Max.
SPI frequency
1)
Maximum SPI frequency
fSPI,max
–
–
4.0
MHz
P_14.8.1
SPI interface; logic inputs SDI, CLK and CSN
H-input voltage threshold
VIH
–
–
–
0.7 ×
VCC1
V
V
V
–
P_14.8.2
P_14.8.3
P_14.8.4
L-input voltage threshold
VIL
0.3 ×
VCC1
–
–
1)
Hysteresis of input voltage VIHY
Pull-up resistance at pin CSN RICSN
–
0.2 ×
VCC1
–
20
20
40
40
80
80
kΩ
kΩ
VCSN = 0.7 × VCC1 P_14.8.5
Pull-down resistance at pin RICLK/SDI
VSDI/CLK
=
P_14.8.6
SDI and CLK
0.2 × VCC1
1)
Input capacitance at pin
CSN, SDI or CLK
CI
–
10
–
–
pF
V
P_14.8.7
Logic output SDO
H-output voltage level
VSDOH
VCC1
0.4
-
VCC1
0.2
-
IDOH = -1.6 mA
IDOL = 1.6 mA
P_14.8.8
L-output voltage level
VSDOL
ISDOLK
–
0.2
–
0.4
10
V
P_14.8.9
Tri-state leakage current
-10
µA
VCSN = VCC1
;
P_14.8.10
0 V < VDO < VCC1
1)
Tri-state input capacitance CSDO
–
10
15
pF
P_14.8.11
Data input timing1)
Clock period
tpCLK
tCLKH
tCLKL
250
125
125
125
250
250
125
100
50
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
ns
ns
ns
ns
ns
ns
ns
ns
ns
–
–
–
–
–
–
–
–
–
P_14.8.12
P_14.8.13
P_14.8.14
P_14.8.15
P_14.8.16
P_14.8.17
P_14.8.18
P_14.8.19
P_14.8.20
Clock HIGH time
Clock LOW time
Clock LOW before CSN LOW tbef
CSN setup time
CLK setup time
tlead
tlag
Clock LOW after CSN HIGH tbeh
SDI setup time
SDI hold time
tDISU
tDIHO
Datasheet
117
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Serial Peripheral Interface
Table 23 Electrical characteristics: power stage (cont’d)
Tj = -40°C to +150°C, VS = 5.5 V to 28 V, all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Typ.
–
Unit Note or
Test Condition
Number
Min.
Max.
Input signal rise time at pin trIN
SDI, CLK and CSN
–
50
ns
ns
µs
µs
–
P_14.8.21
P_14.8.22
P_14.8.23
P_14.8.24
Input signal fall time at pin tfIN
SDI, CLK and CSN
–
–
3
–
–
–
50
10
–
–
–
–
Delay time for mode
changes2)
tDel,Mode
CSN HIGH time
Data output timing1)
SDO rise time
tCSN(high)
trSDO
–
–
–
–
–
30
30
–
80
80
50
50
50
ns
ns
ns
ns
ns
CL = 100 pF
CL = 100 pF
P_14.8.25
P_14.8.26
SDO fall time
tfSDO
SDO enable time
SDO disable time
SDO valid time
tENSDO
tDISSDO
tVASDO
LOW impedance P_14.8.27
HIGH impedance P_14.8.28
–
–
CL = 100 pF
P_14.8.29
1) Not subject to production test; specified by design.
2) Applies to all mode changes triggered via SPI commands.
24
CSN
15
16
17
18
13
14
CLK
SDI
19
20
LSB
MSB
MSB
not defined
27
28
29
SDO
Flag
LSB
Figure 50 SPI timing diagram
Note: Numbers in drawing correlate to the last 2 digits of the number field in the electrical characteristics table.
Datasheet
118
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
15
Application information
15.1
Application diagram with boost module
Note: The following information is given as a hint for the implementation of the device only and should not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
VS
Vsup
C1
VSENSE
VS
D1
L1
L2
D2
VBAT
VS
BCKSW
VS2
CVSUP
C4
C5
C2
C3
VCC1
VCC2
BSTD
BSTG
TBOOST
CVCC2
SNSP
RCFG
VDD
Rsense
CFG
CLK
CSN
SDI
CLK
SNSN
CSN
SDI
VS
VS
T2
VS
SDO
SDO
RO
INT
RO
INT
TLE9271
µC
TXDLIN1
RXDLIN1
TXDLIN2
RXDLIN2
TXDLIN3
RXDLIN3
TXDLIN4
RXDLIN4
TXDLIN1
RXDLIN1
TXDLIN2
RXDLIN2
TXDLIN3
RXDLIN3
TXDLIN4
RXDLIN4
T3
T1
LH1
LH2
LH3
FO1
FO2/FSI
FO3/TEST
VS
Sdev
WK
S3
R4
R5
VSUP
TXDCAN
RXDCAN
TXDCAN
RXDCAN
C9
VLIN
VSS
VCC2
DLIN1 DLIN2
RLIN1 RLIN2
CVCAN
VCAN
CANH
CANH
CANL
LIN1
LIN2
LIN1
LIN2
RCANH
CCAN
RCANL
CANL
CLIN1 CLIN2
GND
Figure 51 Application diagram
Note: This is a very simplified example of an application circuit. The function must be verified in the real
application.
Datasheet
119
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
Table 24 Bill of material for Figure 15.1
Ref.
Typical value
Purpose/comment
Capacitances
C1
47 µF ±20% electrolytic Buffering capacitor to cut off battery spikes, depending on the
application
CVSUP
C2
100 nF ±20% ceramic
Input filter battery capacitor for optimum EMC behavior
100 µF…560 µF ±20%,
50 V electrolytic
Output boost capacitor. ESR ≤ 1 Ω over the temperature range
C3
1 µF…10 µF ±20%,
50 V ceramic
Input buck capacitor. Low ESR
C4
C5
10 µF ±20%, 16 V ceramic 1) Output buck capacitor, for cost optimization. Low ESR
47 µF ±20%,
1) Output buck capacitor, for cost optimization. ESR ≤ 4 Ω over the
16 V electrolytic
temperature range
CVCC2
C9
2.2 µF ±20%,
16 V ceramic
Blocking capacitor, min. 470 nF for stability. Low ESR
10 nF ±20% ceramic
Spikes filtering, as required by application. Mandatory protection for off-
board connection
CVCAN
100 nF ±20%,
16 V ceramic
Input filter CAN supply. The capacitor must be placed close to the VCAN
pin. One additional buffer capacitor ≥1 µF shall be placed for optimum
EMC and CAN FD performances
CCAN
CLIN1
CLIN2
CLIN3
CLIN4
47 nF / OEM dependent Split termination stability
1 nF / OEM dependent
1 nF / OEM dependent
1 nF / OEM dependent
1 nF / OEM dependent
LIN master termination
LIN master termination
LIN master termination
LIN master termination
Resistances
RSENSE 100 mΩ ±1%
Boost regulator current sense. Depending on required current limitation
Required for hardware initialization
RCFG
R4
10 kΩ…22 kΩ ±5%
10 kΩ ±20%
Wetting current of the switch, as required by application
Limit the WK pin current, e.g. for ISO pulses
CAN bus termination
R5
10 kΩ ±20%
RCANH
RCANL
RLIN1
RLIN2
60 Ω / OEM dependent
60 Ω / OEM dependent
1 kΩ / OEM dependent
1 kΩ / OEM dependent
CAN bus termination
LIN master termination (if configured as a LIN master)
LIN master termination (if configured as a LIN master)
Inductors
L1
L2
22 µH ±20%2)
47 µH ±20%2)
Boost regulator coil
Buck regulator coil
Datasheet
120
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
Table 24 Bill of material for Figure 15.1 (cont’d)
Ref.
Typical value
Purpose/comment
Active components
D1
D2
e.g. SS34HE3/9AT
(Vishay)
Reverse polarity protection. Depending for the application
e.g. SL04-GS08 or
SS34HE3/9AT (Vishay)
Boost regulator power diode. Forward current depends on the
application
DLIN1
DLIN2
DLIN3
DLIN4
e.g. BAS70
e.g. BAS70
e.g. BAS70
e.g. BAS70
Requested by LIN standard; reverse polarity protection of network
Requested by LIN standard; reverse polarity protection of network
Requested by LIN standard; reverse polarity protection of network
Requested by LIN standard; reverse polarity protection of network
TBOOST e.g. BSS606N
Boost regulator external MOSFET. Maximum Rds_on ≤ 100 mΩ, Drain
current max ≤ 3 A, Drain-Source max voltage ≤ 60 V
T1
T2
T3
µC
e.g. BCR191W
e.g. BCR191W
e.g. BCR191W
e.g. XC2xxx
High active FO1 control
High active FO2 control
High active FO3 control
Microcontroller
1) For for optimum dynamic behavior, C4 and C5 = 22 µF ±20%, 16 V ceramic low ESR.
2) The saturation current has to be define in according with the maximum current required by the application.
Datasheet
121
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
15.2
Application diagram without boost module
Note: The following information is given as a hint for the implementation of the device only and shall not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
Vsup
VS
VSENSE
VS
D1
L1
L2
VBAT
VS
BCKSW
VS2
C4
C5
C2
C3
C1
CVSUP
VCC1
VCC2
BSTD
BSTG
CVCC2
SNSP
SNSN
RCFG
VDD
CFG
CLK
CSN
SDI
CLK
CSN
SDI
VS
T3
VS
VS
T1
SDO
SDO
RO
INT
RO
INT
µC
TLE9271
TXDLIN1
RXDLIN1
TXDLIN2
RXDLIN2
TXDLIN3
RXDLIN3
TXDLIN4
RXDLIN4
TXDLIN1
RXDLIN1
TXDLIN2
RXDLIN2
TXDLIN3
RXDLIN3
TXDLIN4
RXDLIN4
T2
LH1
LH2
LH3
FO1
FO2/FSI
FO3/TEST
VS
Sdev
WK
S3
R4
R5
VSUP
TXDCAN
RXDCAN
TXDCAN
RXDCAN
C9
VLIN
VSS
VCC2
DLIN1 DLIN2
RLIN1 RLIN2
CVCAN
VCAN
CANH
CANH
CANL
LIN1
LIN2
LIN1
LIN2
RCANH
CCAN
RCANL
CANL
CLIN1 CLIN2
GND
Figure 52 Application diagram
Note: This is a very simplified example of an application circuit. The function must be verified in the real
application.
Datasheet
122
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
Table 25 Bill of material for Figure 15.2
Ref.
Typical value
Purpose/comment
EMI filter components1)
C1
47 µF ±20%,
Input EMI filter capacitor, depending on the application
50 V electrolytic
L1
2.2 µH ±20%2)
Input EMI filter inductor, depending on the application
Input EMI filter capacitor, depending on the application
C2
4.7 µF ±20%,
50 V ceramic low ESR
Capacitances
CVSUP
C3
100 nF ±20% ceramic
Input filter battery capacitor for optimum EMC behavior
Input buck capacitor. Low ESR
1 µF…10 µF ±20%
ceramic
C4
C5
10 µF ±20%, 16 V ceramic 3) Output buck capacitor, for cost optimization. Low ESR
47 µF ±20%,
3) Output buck capacitor, for cost optimization. ESR ≤ 4 Ω over the
16 V electrolytic
temperature range
CVCC2
C9
2.2 µF ±20% ceramic
10 nF ceramic
Blocking capacitor, min. 470 nF for stability. Low ESR
Spikes filtering, as required by application. Mandatory protection for off-
board connection
CVCAN
100 nF ± 20%,
16 V ceramic
Input filter CAN supply. The capacitor must be placed close to the VCAN
pin. One additional buffer capacitor ≥ 1 µF shall be placed for optimum
EMC and CAN FD performances
CCAN
CLIN1
CLIN2
CLIN3
CLIN4
47 nF / OEM dependent Split termination stability
1 nF / OEM dependent
1 nF / OEM dependent
1 nF / OEM dependent
1 nF / OEM dependent
LIN master termination
LIN master termination
LIN master termination
LIN master termination
Resistances
RCFG
R4
10 kΩ…22 kΩ ±5%
Required for hardware initialization
10 kΩ ±5%
Wetting current of the switch, as required by application
Limit the WK pin current, e.g. for ISO pulses
CAN bus termination
R5
10 kΩ ±5%
RCANH
RCANL
RLIN1
RLIN2
RLIN3
RLIN4
60 Ω / OEM dependent
60 Ω / OEM dependent
1 kΩ / OEM dependent
1 kΩ / OEM dependent
1 kΩ / OEM dependent
1 kΩ / OEM dependent
CAN bus termination
LIN master termination (if configured as a LIN master)
LIN master termination (if configured as a LIN master)
LIN master termination (if configured as a LIN master)
LIN master termination (if configured as a LIN master)
Inductors
L2
47 µH ±20%2)
Buck regulator coil
Datasheet
123
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
Table 25 Bill of material for Figure 15.2 (cont’d)
Ref.
Typical value
Purpose/comment
Active Components
D1
e.g. SS34HE3/9AT
Reverse polarity protection. Depending for the application
(Vishay)
DLIN1
DLIN2
DLIN3
DLIN4
T1
e.g. BAS70
e.g. BAS70
e.g. BAS70
e.g. BAS70
e.g. BCR191W
e.g. BCR191W
e.g. BCR191W
e.g. XC2xxx
Requested by LIN standard; reverse polarity protection of network
Requested by LIN standard; reverse polarity protection of network
Requested by LIN standard; reverse polarity protection of network
Requested by LIN standard; reverse polarity protection of network
High active FO1 control
T2
High active FO2 control
T3
High active FO3 control
µC
Microcontroller
1) The input EMI filter has to be evaluated in according with the final application. The values are only given as hint.
2) The saturation current has to be define in according with the maximum current required by the application.
3) For optimum dynamic behavior, C4 and C5 = 22 µF ±20%, 16 V ceramic low ESR.
5V_int
SBC Init
Mode
Ttest
RTEST
Connector/
FO3/
Jumper
TEST
REXT
TFO_PL
Failure Logic
Figure 53 Hint for increasing the robustness of pin FO3/TEST during debugging or programming
Datasheet
124
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
15.3
ESD tests
Note: Tests for ESD robustness according to IEC61000-4-2 “gun test” (150pF, 330Ω) have been performed. The
results and test condition are available in a test report. The minimum values for the test are listed in
Table 26 below.
Table 26 ESD “Gun Test”
Performed test
Result
Unit
Remarks
1)2) positive pulse
ESD at pin CANH, CANL,
LIN, versus GND
>6
kV
ESD at pin CANH, CANL,
LIN, versus GND
< -6
kV
1)2) negative pulse
1) ESD susceptibility “ESD GUN” according to LIN EMC 1.3 Test Specification, Section 4.3 (IEC 61000-4-2). Tested by
external test house (IBEE, EMC Test report Nr. 01-03-17).
2) ESD Test “Gun Test” is specified with external components for pins VS, WK, BKSW, VCC2. Refer to application diagram
in Chapter 15.2 for more information.
EMC and ESD susceptibility tests according to SAE J2962-2 (2010) have been performed. Tested by external
test house (UL LLC, Test report Nr. 2017-327).
Datasheet
125
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Application information
15.4
Thermal behavior of package
The figure below shows the thermal resistance (Rth_JA) of the device versus the cooling area on the bottom of
the PCB for TA = 85°C. Every line reflects a different PCB and thermal via design.
80
Tamb=85°C
70
60
2s0p - 25 vias (standard)
50
40
2s2p - 16 vias (standard)
2s2p - 16 vias (solder filled)
30
20
2s2p - 25 vias (standard)
0
100
200
300
400
500
600
Bottom Cooling area (mm2)
Figure 54 Thermal resistance (Rth_JA) versus cooling area
Cross Section (JEDEC 2s2p) with Cooling Area
Cross Section (JEDEC 2s0p) with Cooling Area
70µm modelled (traces)
35µm, 90% metalization*
35µm, 90% metalization*
70µm / 5% metalization + cooling area
*: means percentual Cu metalization on each layer
PCB (top view)
PCB (bottom view)
standard solder pads
Figure 55 Board setup
Board setup is defined according to JESD 51-2,-5,-7.
Board: 76.2 × 114.3 × 1.5 mm3 with 2 inner copper layers (35 µm thick), with thermal via array under the
exposed pad contacting the first inner copper layer and 300 mm2 cooling area on the bottom layer (70 µm).
Datasheet
126
Rev.2.0
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OPTIREG™ SBC TLE9271QX
Package outlines
16
Package outlines
0.9 MAX.
(0.65)
11 x 0.5 = 5.5
0.5
±0.1
7
A
±0.03
0.1
6.8
+0.03 1)
2)
37
B
36
25
24
48x
0.08
48
13
1
12
Index Marking
48x
0.1
0.4 x 45°
±0.05
Index Marking
0.23
M
A B C
(0.2)
0.05 MAX.
(5.2)
(6)
C
1) Vertical burr 0.03 max., all sides
2) These four metal areas have exposed diepad potential
PG-VQFN-48-29, -31-PO V05
Figure 56 PG-VQFN-48 1)
Green Product (RoHS compliant)
To meet the world-wide customer requirements for environmentally friendly products and to be compliant
with government regulations the device is available as a green product. Green products are RoHS-Compliant
(i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).
Further information on packages
https://www.infineon.com/packages
1) Dimensions in mm
Datasheet
127
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Revision history
17
Revision history
Revision
Date
Changes
•
•
•
Editorial changes
2.0
2022-05-06
Added OrderabelPartNumber to the second page
Deleted 47 µH as an option for boost inductor in Chapter 6.2.3 and
Chapter 15.1
•
Added Chapter 6.3.3 and Chapter 6.3.4 with detailed description of the
boost switch gate driver and the BSTG short circuit detection feature.
Therefore replaced parameter P_6.5.27 and P_6.5.9 by new parameter in
Table 10 section “Boost switch gate driver”
•
•
•
Added parameter P_6.5.4 specifying current limit for buck regulator. No
product change.
Correction within WD_CTRL register: Watchdog checksum bit is write only.
Always read as 0. No product change.
Extended the capacitance range of output boost capacitor C2 within the
application information (Chapter 15.1)
•
•
•
•
Pin configuration: Clearer wording for exposed pad connection to GND
Updated specification of charge device model to JEDEC JS-002
Added clarification to P_10.3.1 (VWKth): “Hysteresis included”
Corrected the output circuitry of FO1 in Figure 35 and added explanation
when the pull up transistors are switched. Added parameter RFO1
(P_12.3.12). No product change.
•
Hints for unused pins: Changed recommendation for N.C.-Pins to “leave
open” to gain pin compatibility within the variants.
1.5
2019-09-27 Datasheet updated:
•
•
Editorial changes
General
–
changed “SBC Software development mode” to “SBC development
mode”
•
Updated Table 13
–
–
–
added P_8.3.54 and P_8.3.55 (no product change)
tightened P_8.3.15
tightened P_8.3.8 and P_8.3.42 by additional footnote
•
Added Figure 53
1.4
1.3
2018-11-20 Datasheet updated:
Updated CAN description (Figure 3, Figure 5.1.4, Figure 18, Chapter 8.2.4).
2017-11-17 First revision of datasheet:
Updated description Chapter 13.8.1.
Datasheet
128
Rev.2.0
2022-05-06
OPTIREG™ SBC TLE9271QX
Revision history
Revision
Date
2017-10-22 Preliminary Datasheet:
Updated the Figure 3 on SBC Normal Mode.
Changes
1.2
Update the description of Figure 21.
Removed the “optional” on Figure 21.
Added P_8.3.58 (according to ISO11898-2:2016).
Added P_4.1.28 (according to ISO11898-2:2016).
Correct description Chapter 13.5.1.
Correct description Chapter 13.5.2 and updated Figure 45.
Corrected the bit type of SMPS_STAT register.
Corrected description on Chapter 13.8.3 and Figure 3.
Updated P_8.3.7 test conditions.
Updated P_8.3.6 test conditions.
Updated P_8.3.5 test conditions.
Updated P_8.3.16 test conditions.
Updated the description about LIN rearming in Chapter 9.2.4.
Updated the description about CAN rearming in Chapter 8.2.4.
Updated SYS_STAT_CTRL register note description.
Updated Chapter 9.2.6 description.
Update Chapter 8.2.7 description.
Added chapter outcome pre and system tests verification.
Added P_8.3.50, P_8.3.51, P_8.3.52 and P_8.3.53.
Change description on WK_LVL_STAT and Table 6 regarding the Fail-Safe
Output behavior in case of watchdog trigger issue.
Added the VCC2,UV Blanking time as internal parameter.
Modified description Chapter 8.2.6.
Add additional Note in SUP_STAT, BUS_STAT_1 and BUS_STAT_2 regarding
the register content after one software reset.
Update LIN wake-up description.
Updated description Chapter 13.8.3.
Updated parameter P_13.9.34.
Updated FSI in Stop Mode and Restart Mode description.
Updated max limit of P_12.3.11.
Updated description DEV_STAT register Notes.
Update test condition P_8.3.26.
1.1
2016-10-17 Target Datasheet updated:
Added CAN FD timing parameters up to 5Mbps.
Corrected the naming of Figure 22 (tLOOP,f and tLOOP,r).
Updated the title of Figure 41 and Figure 42.
Improve the description of LIN wake-up pattern detection (Chapter 9.2.4).
Updated footnote 5) on Chapter 8.3 according to ISO11898-2.
Added description 11B on WD_FAIL: reserved (never achieved).
Updated description Chapter 13.2.3.
1.0
2015-10-08 First Revision of Datasheet.
Datasheet
129
Rev.2.0
2022-05-06
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Document reference
Z8F68481959
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