SX9500EVK [SEMTECH]
Ultra Low Power, Capacitive Four (4) - Channel Proximity/Button; 超低功耗，电容四（4 ） - 通道接近/按钮
| 型号： | SX9500EVK |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Ultra Low Power, Capacitive Four (4) - Channel Proximity/Button |
| 文件： | 总31页 (文件大小：859K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
G
ENERAL
D
ESCRIPTION
KEY PRODUCT FEATURES
´
´
2.7 – 5.5V Input Supply Voltage
Capacitive Sensor Inputs
The SX9500 is a low-cost, very low power 4-channel
capacitive controller that can operate either as a proximity
or button sensor. The SX9500 includes sophisticated on-
chip auto-calibration circuitry to regularly perform sensitivity
adjustments, maintaining peak performance over a wide
variation of temperature, humidity and noise environments,
providing simplified product development and enhanced
performance.
∑
4 fF Capacitance Resolution
∑
∑
Stable Proximity & Touch Sensing With Temperature
Capacitance Offset Compensation to 30pF
´
´
´
Active Sensor Guarding
Automatic Calibration
Ultra Low Power Consumption:
A dedicated transmit enable (TXEN) pin is available to
synchronize capacitive measurements for applications that
require synchronous detection, enabling very low supply
current and high noise immunity by only measuring
proximity when requested.
∑
∑
∑
Active Mode:
Doze Mode:
Sleep Mode:
170 uA
18 uA
2.5 uA
´
400KHz I2C Serial Interface
∑
Four programmable I2C Sub-Addresses
The SX9500 operates directly from an input supply voltage
of 2.7 to 5.5V, and includes a separate I2C serial bus
supply input to enable communication with 1.8 – 5.5V
hosts. The I2C serial communication bus reports proximity
or touch detection and is used to facilitate parameter
settings adjustment. Upon a proximity detection, the NIRQ
output asserts, enabling the user to either determine the
relative proximity distance, or simply obtain an indication of
detection. The serial bus can also serve to overwrite
detection thresholds and operational settings in the event
the user wants to change them from their factory presets.
∑
Input Levels Compatible with 1.8V Host Processors
´
´
Open Drain NIRQ Interrupt pin
Three (3) Reset Sources: POR, NRST pin, Soft
Reset
´
´
´
-40°C to +85°C Operation
Compact Size: 3 x 3mm Thin QFN package
Pb & Halogen Free, RoHS/WEEE compliant
A
PPLICATIONS
•
•
•
Notebooks
Tablets
Mobile Appliances
O
RDERING INFORMATION
Marki
ng
ZND8
Semtech P/N
Package
SX9500IULTRT Note1
QFN-20
Eval. Kit
SX9500EVK
Note 1: Quantities are ordered in 3K units per Reel
TYPICAL APPLICATION CIRCUIT
Figure 1: Typical Application Circuit
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
Table of Contents
G
ENERAL
EY RODUCT
PPLICATIONS.......................................................................................................................................1
RDERING NFORMATION......................................................................................................................1
YPICAL PPLICATION CIRCUIT............................................................................................................1
ENERAL ESCRIPTION...............................................................................................................5
D
ESCRIPTION........................................................................................................................1
K
A
P
FEATURES.....................................................................................................................1
O
I
T
1
A
G
D
1.1
1.2
1.3
1.4
Pin Diagram
5
5
6
6
Marking information
Pin Identification
Acronyms
2
3
ELECTRICAL CHARACTERISTICS .................................................................................................7
2.1
2.2
2.3
Absolute Maximum Ratings
Recommended Operating Conditions
Thermal Characteristics
7
7
7
8
Electrical Specifications
FUNCTIONAL DESCRIPTION........................................................................................................ 11
3.1
Introduction
General
Parameters and Configuration
Sensor Touch/Proximity Adjustment
Scan Period
11
11
11
11
3.1.1
3.1.2
3.1.3
3.2
3.3
3.4
3.5
11
12
13
Operational Modes
Configuration
Reset
13
13
14
14
3.5.1
3.5.2
3.5.3
Power-up
NRST
Software Reset
3.6
Interrupt
15
15
15
3.6.1
3.6.2
Power-up
NIRQ Clearing
4
PIN DESCRIPTIONS ..................................................................................................................... 16
4.1
4.2
4.3
4.4
4.5
Introduction
16
16
16
16
VDD and SVDD
TXEN
Capacitor Sensing Interface (CS0, CS1, CS2, CS3, CSG)
Host Interface
NIRQ
16
16
17
17
4.5.1
4.5.2
4.5.3
SCL, NRST and TXEN
SDA
5
DETAILED
CONFIGURATION DESCRIPTIONS .............................................................................. 18
5.1
5.2
Introduction
18
Capacitive Sensor (CS0, CS1, CS2, CS3) Parameters
Set CPS_Digital_GAIN [6:5] (Cap Sensor Gain)
Set CPS_CINR [1:0] (Input Capacitance Range and Resolution)
Set CPS_TRS [4:0] (Detection threshold)
18
18
18
19
20
20
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
Set CPS_HYST [5:4] (Detection Hysteresis)
Set CPS_AVGDEB[7:6] (Average Pos/Neg Debouncing)
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
5.2.6
5.2.7
5.2.8
5.2.9
Set CPS_AVGNEGFILT[5:3] & CPS_AVGPOSFILT[2:0] (Average Neg/Pos Filters)
Set CPS_FS[4:3] (Sampling Frequency)
20
21
21
21
Set CPS_RES[2:0] (Resolution Factor)
Set CPS_AVGTRS[7:0] (Averaging Threshold)
5.3
Additional Parameter Settings
22
22
22
22
5.3.1
5.3.2
5.3.3
Set CPS_PERIOD[6:4] (Scan Period)
Set CPS_EN [3:0] (Enable Capacitive Sensor Inputs)
Set IRQ_Enable [6:3] (Enable Interrupt Sources)
6
7
I2C INTERFACE........................................................................................................................... 23
6.1
6.2
6.3
6.4
I2C Write
23
24
25
28
I2C Read
Register Overview
Sensor Design
P
ACKAGING INFORMATION ........................................................................................................ 29
7.1
7.2
Package Outline Drawing
Land Pattern
29
30
LIST OF FIGURES
Figure 1: Typical Application Circuit.....................................................................................................................1
Figure 2: Pin Diagram .............................................................................................................................................5
Figure 3: QFN Marking Information.......................................................................................................................5
Figure 4: I2C Start and Stop timing.....................................................................................................................10
Figure 5: I2C Data timing......................................................................................................................................10
Figure 6 Scan Period.............................................................................................................................................11
Figure 7: Power-up vs. NIRQ................................................................................................................................13
Figure 8: Hardware Reset.....................................................................................................................................14
Figure 9: Software Reset ......................................................................................................................................14
Figure 10: NIRQ Output Simplified Diagram ......................................................................................................16
Figure 11: SCL/TXEN/NRST .................................................................................................................................17
Figure 12: SDA Simplified Diagram.....................................................................................................................17
Figure 13: I2C Write...............................................................................................................................................23
Figure 14: I2C Read...............................................................................................................................................24
Figure 15: Typical Touch/Proximity Capacitive Sensor....................................................................................28
Figure 16: Package Outline Drawing...................................................................................................................29
Figure 17: Package Land Pattern ........................................................................................................................30
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
LIST OF TABLES
Table 1: Pin Description .........................................................................................................................................6
Table 2: Absolute Maximum Ratings ....................................................................................................................7
Table 3: Recommended Operating Conditions....................................................................................................7
Table 4: Thermal Characteristics...........................................................................................................................7
Table 5: Electrical Characteristics.........................................................................................................................9
Table 6: I2C Timing Specification........................................................................................................................10
Table 7: I2C Sub-Address Selection....................................................................................................................12
Table 8: CPS_Digital_GAIN ..................................................................................................................................18
Table 9: CINPUT Range and Resolution Register .................................................................................................18
Table 10: Cap Sensor Threshold .........................................................................................................................19
Table 11: CPS_HYST.............................................................................................................................................20
Table 12: CPS_AVGDEB.......................................................................................................................................20
Table 13: Sampling Frequency Control ..............................................................................................................21
Table 14: CPS Resolution Factor.........................................................................................................................21
Table 15: Scan Period, Register 0x06 .................................................................................................................22
Table 16: Register Overview ................................................................................................................................28
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
1 GENERAL ESCRIPTION
D
1.1 Pin Diagram
Figure 2: Pin Diagram
1.2 Marking information
ZND8
yyww
xxxx
yyww= Date Code
xxxx = Lot Number
Figure 3: QFN Marking Information
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
1.3 Pin Identification
Pin
Name
Type
Description
Number
1
CSG
CS3
CS2
CS1
CS0
GND
NC
Analog
Analog
Capacitive Sensor Guard
Capacitive Sensor, 3
Capacitive Sensor, 2
Capacitive Sensor, 1
Capacitive Sensor, 0
Ground
2
3
Analog
4
Analog
5
Analog
6
Ground
Not Used
Not Used
Not Used
Not Used
Power
7
Do Not Connect
Do Not Connect
8
NC
Do Not Connect
9
NC
Do Not Connect
10
11
NC
VDD
SX9500 Core Power
Host serial port supply voltage. Must be less than or equal to VDD. NOTE:
During power-up or power-down, SVDD must be less than or equal to VDD
12
SVDD
Power
13
14
NIRQ
SCL
SDA
TXEN
NRST
A1
Digital Output
Digital Input
Digital I/O
Input
Interrupt request, active LOW, requires pull-up resistor to SVDD
I2C Clock, requires pull up resistor to SVDD
I2C Data, requires pull up resistor to SVDD
Transmit Enable, active HIGH (Tie to SVDD if not used).
External reset, active LOW, requires pull up resistor to SVDD
I2C Sub-Address, connect to GND or VDD
I2C Sub-Address, connect to GND or VDD
Ground
15
16
17
Input
18
Digital Input
Digital Input
Ground
19
A0
20
GND
GND
DAP
Ground
Exposed Pad. Connect to Ground
Table 1: Pin Description
1.4 Acronyms
DAP
Die Attach Paddle
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
2 ELECTRICAL
CHARACTERISTICS
2.1 Absolute Maximum Ratings
Stresses above the values listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only
and functional operation of the device at these, or any other conditions beyond the “Recommended Operating Conditions”, is not implied.
Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability and proper functionality.
Parameter
Symbol
MIN
-0.5
-0.5
-0.5
-10
MAX
6.0
UNIT
V
V
DD
Supply Voltage
SVDD
VIN
6.0
Input voltage (non-supply pins)
Input current (non-supply pins)
Operating Junction Temperature
Reflow temperature
V
DD+0.3
10
IIN
mA
°C
TJCT
-40
125
260
150
TRE
Storage temperature
TSTOR
ESDHBM
-50
8
ESD HBM (Human Body model, to JESD22-A114)
kV
Table 2: Absolute Maximum Ratings
2.2 Recommended Operating Conditions
Parameter
Symbol
VDD
MIN
2.7
MAX
5.5
UNIT
V
Supply Voltage
SVDD
TA
1.65
-40
VDD
85
Ambient Temperature Range
°C
Table 3: Recommended Operating Conditions
NOTE: During power-up or power-down, SVDD must be less than or equal to VDD
2.3 Thermal Characteristics
Parameter
Symbol
MIN
Typical
34
MAX
UNIT
°C/W
Thermal Resistance – Junction to Air (Static Airflow)
θJA
Table 4: Thermal Characteristics
NOTE: Theta JA is calculated from a package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias
under exposed pad per JESD51 standards.
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
Electrical Specifications
All values are valid within the operating conditions unless otherwise specified.
Parameter
Symbol
Conditions
MIN
TYP
MAX
UNIT
Current consumption
Power down, all analog circuits shut
down.
(I2C listening)
Sleep Mode
Doze
ISLEEP
2.5
18
CPS_PERIOD = 200mS
DozePeriod = 2xCps_Period
CPS_FS = 167KHz
IDOZE
uA
CPS_RES = Medium
CPS_PERIOD = 30mS
CPS_FS = 167KHz
CPS_RES = Medium
Active
IACTIVE
170
Outputs: SDA, NIRQ
Output Current at Output Low
Voltage
VOL = 0.4V
IOL
6
mA
V
SVDD > 2V
0.4
Maximum Output LOW Voltage VOL(Max)
SVDD ≤ 2V
0.2 x SVDD
Inputs: SCL, SDA, TXEN
Input logic high
VIH
VIL
0.8 x SVDD
SVDD + 0.3
0.25 x SVDD
1
V
Input logic low
-0.3
-1
CMOS input
SVDD> 2V
Input leakage current
I
L
uA
VHYS
0.05x
SVDD
Hysteresis
V
0.1x
SVDD
SVDD≤ 2V
Delay to when the SX9500 actually
begins measure-ments from when
TXEN becomes active
TXENACTDLY
100
µs
TXEN measurements
Inputs: A0, A1
Input logic high
VIH
VIL
0.7 x VDD
-0.3
V
DD + 0.3
V
Input logic low
0.3 x VDD
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
Input: NRST
0.7 x
SVDD
SVDD> 2V
Input logic high
Input logic low
VIH
SVDD + 0.3
0.75 x
SVDD
SVDD ≤ 2V
V
SVDD> 2V
0.6
VIL
SVDD ≤ 2V
0.3 x SVDD
Start-up
Power-up time
NRST
TPOR
1
ms
ns
NRST minimum pulse width
TRESETPW
20
Table 5: Electrical Characteristics
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
Parameter
Symbol
Conditions
MIN
TYP
MAX
UNIT
I2C Timing Specifications
SCL clock frequency
400
kHz
fSCL
SCL low period
1.3
0.6
100
0
tLOW
SCL high period
tHIGH
Data setup time
tSU;DAT
tHD;DAT
tSU;STA
tHD;STA
tSU;STO
tBUF
Data hold time
us
Repeated start setup time
Start condition hold time
Stop condition setup time
Bus free time between stop and start
Input glitch suppression
0.6
0.6
0.6
1.3
Note (1)
50
ns
tSP
Note (1) -- Minimum glitch amplitude is 0.7VDD at High level and Maximum 0.3VDD at Low level.
Table 6: I2C Timing Specification
Note: All timing specifications, refer to Figure 4, Figure 5, and Table 6
Figure 4: I2C Start and Stop timing
Figure 5: I2C Data timing
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
3 FUNCTIONAL DESCRIPTION
3.1 Introduction
3.1.1 General
The SX9500 is a low-cost, very low-power 4-channel capacitive controller that can operate either as a proximity
or button sensor. The SX9500 includes sophisticated on-chip auto-calibration circuitry to regularly perform
sensitivity adjustments, maintaining peak performance over a wide variation of temperature, humidity and noise
environments, providing simplified product development and enhanced performance.
3.1.2 Parameters and Configuration
The SX9500 allows the user full parameter customization for Sensor sensitivity, hysteresis, and detection
thresholds. If custom parameters are used by the customer, these parameters must be uploaded by the host
immediately following boot-up or after a reset.
3.1.3 Sensor Touch/Proximity Adjustment
Capacitive touch/proximity detection is directly proportional to the SX9500 internal gain and threshold settings,
and external sensor area to optimize proximity detection distance. A longer touch/proximity detection range can
be accomplished without changing the capacitive sensor size, by using a high sensitivity setting and/or lower
signal threshold setting for touch/proximity detection.
3.2 Scan Period
The Scan period determines the minimum touch/proximity detection reaction time of the SX9500 and can be
varied by the host from 30ms to approximately 400ms. Touch/proximity detection reaction time is proportional to
the Scan period and inversely proportional to power consumption, so longer Scan periods corresponds to lower
power, but also to longer detection reaction times.
The Scan period of the SX9500 is defined by two periods: Sensing and Idle. During the Sensing period, all
enabled CS inputs, from CS0 to CS3 are sampled and any detection reported via the I2C bus (via I2C register
polling or NIRQ). The Sensing period is variable and is proportional to the Scan Frequency and Resolution
settings in the Cap Sensing Control Registers. During the Idle period, the SX9500 the analog circuits are placed
in standby and the idle timer is initiated. Upon expiry of the idle timer, a new Scan period cycle begins.
Figure 6 Scan Period
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
3.3 Operational Modes
The SX9500 has four (4) operational modes: Active, Doze, Sleep, and Commanded. These modes enable
tradeoffs between touch/proximity detection reaction time and power consumption.
Active: Active mode has the shortest scan periods, with a typical detection reaction time of 30ms. In this mode,
all enabled sensors are scanned and information data is processed within this interval. The Active scan period is
user configurable and can be extended to a maximum period of 400ms. See CPS_PERIOD register in Section
6.3, (I2C Register Overview) below.
Doze: Doze mode is by default, enabled in the SX9500. The Doze mode period is user configurable (see
Section 6.3, I2C Register Overview) and can be used to extend the scan period out to 6.4 seconds for very low
power consumption applications at the expense of very long detection reaction times (6.4 seconds).
In some applications, the detection reaction time needs to be fast, but can be slow when detection has not been
active for a while. When the SX9500 has not detected an object for a specific time, it will automatically change
modes from Active to Doze reducing power. This time-out period is determined by the CPS_DOZEPERIOD
which can be configured by the user or turned OFF (CPS_DOZEEN) if not required.
Proximity detection on any sensor will cause the SX9500 to leave Doze mode and re-enter Active mode.
Sleep: Sleep mode places the SX9500 in its lowest power mode, disabling all sensor scanning and setting the
idle period to continuous. In this mode, only the I2C serial bus is active.
Commanded: The commanded mode uses the TXEN input. The TXEN input enables the measurement of the
capacitive channels when HIGH, likewise when the TXEN input is LOW, the SX9500 is in the Sleep mode.
Specifically, on the rising edge of TXEN the SX9500 will begin measuring the capacitive channels beginning with
the lowest enabled channel repeating the measurement cycle at programmed rates so long as TXEN remains
HIGH. When TXEN goes LOW the current measurement sequence will complete and then measurement will
cease until the next rising edge of TXEN.I2C interface
The I2C serial interface is configured as a slave device, operates at speeds up to 400 kHz and serves as the sole
Host interface to the SX9500.
The SX9500 has two I/O pins (A0 and A1) that provides for four possible, user selectable I2C addresses:
A1
0
A0
0
Address
0x28
0
1
0x29
1
0
0x2A
1
1
0x2B
Table 7: I2C Sub-Address Selection
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
3.4 Configuration
If the application requires customization, the SX9500 configuration registers can be changed over the I2C bus.
Some I2C addressable registers are used to read sensor status and information, while other (configuration)
registers allow the host to take control of the SX9500. Via the configuration registers, the host can command an
operational mode change or modify the active sensors. These user programmable configuration registers are
volatile, therefore during a power-down or reset event, they lose all user programmed content, requiring the host
to re-write the I2C registers after the event.
3.5 Reset
A Reset to the SX9500 is performed by any one of the following methods:
- Power-up
- NRST pin
- Software reset
3.5.1 Power-up
During a power-up condition, the NIRQ output is HIGH until VDD has met the minimum input voltage requirements
and a TPOR time has expired upon which, NIRQ asserts to a LOW condition indicating the SX9500 is initialized.
The Host is required to perform an I2C read to clear this NIRQ status. The SX9500 is then ready for normal I2C
communication and is operational.
Figure 7: Power-up vs. NIRQ
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
3.5.2 NRST
When NRST is asserted LOW and then HIGH, the SX9500 will reset its internal registers and will become active
after period, TPOR. If a hardware reset control output is not available to drive NRST, then this pin must be pulled
high to SVDD.
Figure 8: Hardware Reset
3.5.3 Software Reset
The host can perform software resets by writing to the I2CSoftReset register (see Section 6.3 for additional
information). The NIRQ output will be asserted LOW and the Host is required to perform an I2C read to clear this
NIRQ status.
Figure 9: Software Reset
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
3.6 Interrupt
Interrupt sources are disabled by default upon power-up and resets, and thus must be enabled by the host (apart
from RESET IRQ). Any or all of the following interrupts can be enabled by writing a “1” into the appropriate
locations within the IRQEnable register (see Section 6.3 for details):
• Touch or Proximity detected
• Completed Compensation
• Completed Conversion
The interrupt status can be read from register IRQStat for each of these interrupt sources (see Section 6.3 for
details).
3.6.1 Power-up
During initial power-up, the NIRQ output is HIGH. Once the SX9500 internal power-up sequence has completed,
NIRQ is asserted LOW, signaling that the SX9500 is ready. The host must perform a read to IRQSTAT to
acknowledge that the status is read and the SX9500 will clear the interrupt and release the NIRQ line.
3.6.2 NIRQ Clearing
The NIRQ can be asserted in either the Active or Doze mode during a scan period. The NIRQ will be cleared
when the Host performs a read of the RegIrqStat I2C register.
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SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
DATASHEET
WIRELESS & SENSING
4 PIN DESCRIPTIONS
4.1 Introduction
This section describes the SX9500 pin functionality, pin protection, whether or not the pins are analog or digital,
and if they require pull-up resistors. There is ESD protection on all SX9500 I/O.
4.2 VDD and SVDD
These are the device supply voltages. VDD is the supply voltage for the internal core and I/O. SVDD is the
supply voltage for the I2C serial interface. NOTE: SVDD MUST be equal or lower than VDD.
4.3 TXEN
This signal can be used in many applications if a conversion trigger/enable is needed. This input pin
synchronizes the capacitance sensing inputs. When this signal is active, SX9500 immediately performs
capacitive measurements. If this input becomes inactive during the middle of a measurement, the SX9500 will
complete all remaining measurements and will enter sleep mode until TXEN goes active again.
4.4 Capacitor Sensing Interface (CS0, CS1, CS2, CS3, CSG)
The Capacitance Sensor input pins CS0, CS1, CS2 and CS3 are connected directly to the Capacitor Sensing
Interface circuitry which converts the sensed capacitance into digital values. The Capacitive Sensor Guard
(CSG) output provides a guard reference to minimize the parasitic sensor pin capacitances to ground.
Capacitance sensor pins which are not used must be left open-circuited. Additionally, CS pins must be
connected directly to the capacitive sensors using a minimum length circuit trace to minimize external “noise”
pick-up.
The capacitance sensor and capacitive sensor guard pins are protected from ESD events to VDD and GROUND.
4.5 Host Interface
The Host Interface consists of: NIRQ, NRST, SCL, SDA, and TXEN. These signals are discussed below.
4.5.1 NIRQ
The NIRQ pin is an open drain output that requires an external pull-up resistor (1..10 kOhm). The NIRQ pin is
protected from ESD events to SVDD and GROUND.
SVDD
SVDD
R_INT
NIRQ
NIRQ to Host
INT
SX9500
Figure 10: NIRQ Output Simplified Diagram
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4.5.2 SCL, NRST and TXEN
The SCL, NRST and TXEN pins are high impedance input pins that require an external pull-up resistor (1..10
kOhm). It is possible to connect NRST and TXEN Host output drivers directly without the requirement for a pull-
up resistor if driven from a push-pull host output. These pins are protected from ESD events to SVDD and
GROUND.
SVDD
SVDD
R
SCL_IN/TXEN_IN/NRST_IN
SCL/TXEN/NRST
FromHost
Figure 11: SCL/TXEN/NRST
4.5.3 SDA
SDA is an I/O pin that requires an external pull-up resistor (1..10 kOhm). The SDA I/O pin is protected to SVDD
and GROUND.
SVDD
SVDD
R_SDA
SDA
SDA_IN
To/From Host
SDA_OUT
Figure 12: SDA Simplified Diagram
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5 DETAILED
CONFIGURATION DESCRIPTIONS
5.1 Introduction
The SX9500 is a low-cost, very low power 4-channel capacitive controller that can operate either as a proximity
or button sensor. It includes sophisticated on-chip auto-calibration circuitry to regularly perform sensitivity
adjustments, maintaining peak performance over a wide variation of temperature, humidity and noise
environments, providing simplified product development and enhanced performance. The SX9500 comes with
factory default settings that are appropriate for most general applications, however a full complement of registers
are accessible to the user to enable application customization and optimization. A dedicated transmit enable
(TXEN) pin is available to synchronize capacitive measurements and reduce power dissipation for applications
that require synchronous detection, enabling very low supply current and high noise immunity by only measuring
proximity when requested.
5.2 Capacitive Sensor (CS0, CS1, CS2, CS3) Parameters
The SX9500 sensor has default parameters for the Capacitive Sensors that provides a quick and initial starting
point to achieve touch/proximity detection. However, because of unique sensor sizes and sensor locations, it is
possible to achieve higher and more robust performance with minor changes to these default parameters. In
general only a few registers require changes to their default parameters to achieve improved performance.
These registers are:
5.2.1 Set CPS_Digital_GAIN [6:5] (Cap Sensor Gain)
The address for the (capacitive) sensor gain is: Bits [6:5] provide for four (4) gain settings as shown below:
Bits
6
0
0
1
1
5
0
1
0
1
Gain
x 1
x 2
x 4
x 8
Table 8: CPS_Digital_GAIN
5.2.2 Set CPS_CINR [1:0] (Input Capacitance Range and Resolution)
The register for the input capacitance full scale range and resolution is: Bits [1:0] provide set ability over the
expected maximum sensed capacitance. A setting of 00 on these bits provides for the largest capacitance
measurement range, but is not as sensitive for the longest proximity distance, while the setting of 11 provides for
the smallest capacitive measurement range, and provides the longest proximity distance. The table for this
register is shown below:
Bits
1
0
0
1
1
0
0
1
0
1
CINPUT Range/Resolution
Large
Medium-Large
Medium-Small
Small
Table 9: CINPUT Range and Resolution Register
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5.2.3 Set CPS_TRS [4:0] (Detection threshold)
This register defines the detection threshold for all sensors and the details are shown below. Lower thresholds
provide longer proximity detection distances but are more susceptible to noise, while higher threshold values
provide immunity to noise, but results in shorter proximity detection range. The default value for this register is
[00000].
BITS
4
3
2
1
0
THRESHOLD VALUE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
350
400
450
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
Table 10: Cap Sensor Threshold
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5.2.4 Set CPS_HYST [5:4] (Detection Hysteresis)
This register defines the detection hysteresis for all sensors. Hysteresis for the capacitive sensors provides an
important function in that it keeps the SX9500 from providing “oscillating” results when detection levels are close
to threshold. The register details are shown below.
Bits
5
0
0
1
1
4
0
1
0
1
DETECTION HYSTERESIS
32
64
128
256
Table 11: CPS_HYST
5.2.5 Set CPS_AVGDEB[7:6] (Average Pos/Neg Debouncing)
Use of debounce in the SX9500 is recommended as it will reduce the effects of extraneous noise for reported
detection. The SX9500 includes several conditions for debounce: Close, Far, and Data Detection.
Bits
7
0
0
1
1
6
0
1
0
1
AVERAGE POS/NEG DEBOUNCING
OFF
2 Samples
4 Samples
8 Samples
Table 12: CPS_AVGDEB
5.2.6 Set CPS_AVGNEGFILT[5:3] & CPS_AVGPOSFILT[2:0] (Average Neg/Pos Filters)
The SX9500 includes circuitry to average out the detected signals. These detected signals can be both positive
and negative, and so there are registers to control both the positive and negative averaging filter coefficients.
There are eight (8) settings possible in each of these filters ranging from OFF up to Highest filtering. Use of
these filters is recommended for noisy environment and represents a tradeoff detection response versus false
triggering. See CPS_AVGNEGFILT and CPS_AVGPOSFILT for register and bit locations.
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5.2.7 Set CPS_FS[4:3] (Sampling Frequency)
The capacitance sampling frequency can be changed in CPS_CTRL2 if the environment is particularly noisy.
Changing this frequency affects the Capacitance Sensing period. It is recommended to use the 167 kHz
sampling frequency.
Bits
4
0
0
1
1
3
0
1
0
1
SAMPLING FREQUENCY
83 kHz
125 kHz
167 kHz
Reserved, do not use
Table 13: Sampling Frequency Control
5.2.8 Set CPS_RES[2:0] (Resolution Factor)
The CPS Resolution factor has eight (8) possible settings that range from coarsest to very fine that controls the
total number of measurements per sensor in a Scan Period. Along with the CPS Sampling Frequency, changing
this register affects the SX9500 Sensing Period. This register is located in CPS_CTRL2.
Bits
2
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
RESOLUTION
Coarsest
Very Coarse
Coarse
Medium Coarse
Medium
Fine
Very Fine
Finest
Table 14: CPS Resolution Factor
5.2.9 Set CPS_AVGTRS[7:0] (Averaging Threshold)
The SX9500 performs averaging on all capacitive measurements to determine when to perform a calibration
cycle. The CPS_AVGTRS register is used to set an 8-bit positive and negative threshold that determines when a
calibration is internally requested. Typically the user would set this register to be between 10000000 [7:0] to
11000000 [7:0] which corresponds to ½ to ¾ of the system dynamic range.
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5.3 Additional Parameter Settings
Further application customization is possible to control scan period, enabled sensors and individual sensor
interrupts are also possible. Scan period affects both power dissipation and detection reaction time.
5.3.1 Set CPS_PERIOD[6:4] (Scan Period)
This register controls the scan period of the SX9500 over a range of 30ms to 400ms.
Bits
6
0
0
0
0
1
1
1
1
5
0
0
1
1
0
0
1
1
4
0
1
0
1
0
1
0
1
Scan PERIOD (ms)
30
60
90
120
150
200
300
400
Table 15: Scan Period, Register 0x06
5.3.2 Set CPS_EN [3:0] (Enable Capacitive Sensor Inputs)
If any capacitive sensors are not required, they can be disabled in this register. Each bit in this register
corresponds to a specific sensor input. A logic “1” enables the capacitive sensor input, while a logic “0” disables
a capacitive input.
CS0 = Bit 0
CS1 = Bit 1
CS2 = Bit 2
CS3 = Bit 3
5.3.3 Set IRQ_Enable [6:3] (Enable Interrupt Sources)
There are a number of interrupt sources that the SX9500 can report. A logic “1” in the specific location will
enable the specific interrupt as shown below.
TCHIRQEN [6]: Enables the Touch/Proximity Detection IRQ
RLSIRQEN [5]: Enables the Touch/Proxmity No Detect IRQ
COMPDONEIRQEN [4]: Enables the Compensation Done Notification IRQ
CONVIRQEN [3]: Enables the Conversion Completion Done Notification IRQ
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6 I2C INTERFACE
The I2C implemented on the SX9500 is compliant with:
- Standard (100kb/s) and fast mode (400kb/s)
- I2C standard slave mode
- 7 bit address (default is 0x28 assuming A1=A0=0).
The host can use the I2C to read and write data at any time, and these changes are effective immediately.
Therefore the user should ideally disable the sensor before changing settings, or discard the results while
changing (Section 3.2).
There are four types of I2C registers:
- Control and Status (read). These registers give information about the status of the capacitive sensors
- Operation Control (read/write). These registers control Operating Modes.
- Cap Sensor Control and Parameters (read/write)
- Cap Sensor Data Read Back (read)
The I2C can be used to read and write from a start address and then perform read or writes sequentially, and the
address increments automatically.
Supported I2C access formats are described in the next sections.
6.1 I2C Write
The format of the I2C write is given in Figure 12. After the start condition [S], the slave address (SA) is sent,
followed by an eighth bit (‘0’) indicating a Write. The SX9500 then Acknowledges [A] that it is being addressed,
and the Master sends an 8 bit Data Byte consisting of the SX9500 Register Address (RA). The Slave
Acknowledges [A] and the master sends the appropriate 8 bit Data Byte (WD0). Again the Slave Acknowledges
[A]. In case the master needs to write more data, a succeeding 8 bit Data Byte will follow (WD1), acknowledged
by the slave [A]. This sequence will be repeated until the master terminates the transfer with the Stop condition
[P].
Figure 13: I2C Write
The register address is incremented automatically when successive register data (WD1...WDn) is supplied by the
master.
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6.2 I2C Read
The format of the I2C read is given in Figure 13. After the start condition [S], the slave address (SA) is sent,
followed by an eighth bit (‘0’) indicating a Write. The SX9500 then Acknowledges [A] that it is being addressed,
and the Master responds with an 8-bit Data consisting of the Register Address (RA). The Slave Acknowledges
[A] and the master sends the Repeated Start Condition [Sr]. Once again, the slave address (SA) is sent,
followed by an eighth bit (‘1’) indicating a Read. The SX9500 responds with an Acknowledge [A] and the read
Data byte (RD0). If the master needs to read more data it will acknowledge [A] and the SX9500 will send the
next read byte (RD1). This sequence can be repeated until the master terminates with a NACK [N] followed by a
stop [P].
Figure 14: I2C Read
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Ultra Low Power, Capacitive
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6.3 Register Overview
Add Reg
Acc Bits Field
Reset
Function
General Control & Status
0x00 IRQStat
R
7
6
RESETIRQ
TCHIRQ
1
0
Reset event occurred
Sensor detected a
touch/proximity
5
4
RLSIRQ
0
0
Sensor detected a release
condition
Compensation complete.
Writing a one in this bit trigs
a compensation on all
channels
R/W
COMPDONE
R
R
3
CONVIRQ
0
00
0
Conversion cycle complete
Not Used
Reports TXEN pad status
2:1 Not Used
0
7
TXENSTAT
TCHSTAT3
0x01 TchCmpStat
0
Determines if
touch/proximity has been
detected on CS3
6
5
4
TCHSTAT2
TCHSTAT1
TCHSTAT0
0
0
Determines if
touch/proximity has been
detected on CS2
Determines if a
touch/proximity has been
detected on CS1
0
Determines if a
touch/proximity has been
detected on CS0
3:0 COMPSTAT
1111
Specifies which capacitive
sensor(s) has a
compensation pending
General Operations Control
0x03 IRQ_Enable
R
R/W
7
6
5
4
Not Used
TCHIRQEN
RLSIRQEN
COMPDONEIRQEN
0
0
0
0
Not Used
Enables the detection irq
Enables the release irq
Enables the compensation
irq
3
CONVIRQEN
0
000
Enables the conversion irq
Not Used
R
2:0 Not Used
Cap Sensing Control
0x06 CPS_CTRL0
R/W
7
Not Used
0
Not Used
6:4 CPS_PERIOD
000
Scan period :
000: 30 ms
001: 60 ms
010: 90 ms
011: 120 ms
100: 150 ms
101: 200 ms
110: 300 ms
111 : 400 ms
Enables CS0 through CS3
CG bias/shield usage.
00 : Off, CG high-Z (off)
01: On(def.)
3:0 CPS_EN
R/W 7:6 CPS_SH
1111
01
0x07 CPS_CTRL1
10: Reserved
11: Reserved
Not used
Capacitance
Resolution:
5:2
0000
00
R/W 1:0 CPS_CINR
Range
&
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DATASHEET
00: Large
01: Medium Large
10: Medium Small
11: Small
0x08 CPS_CTRL2
R/W
7
Not Used
0
Not Used
6:5 CPS_Digital_GAIN
00
Set Digital gain factor
00: Gain = 1
01: Gain = 2
10: Gain = 4
11: Gain = 8
4:3 CPS_FS
01
Sampling frequency
00: 83 kHz
01: 125 kHz
10: 167 kHz (Typical)
11: Reserved
Resolution Control
000: Coarsest
….
2:0 CPS_RES
000
….
111: Finest
0x09 CPS_CTRL3
R/W
7
6
Not Used
CPS_DOZEEN
0
1
00
Not Used
Enables doze mode
When doze is enabled, the
cap sensing period moves
5:4 CPS_DOZEPERIOD
from
CPS_PERIOD
to
CPS_PERIOD * :
00: 2*CPS_PERIOD
10: 8* CPS_PERIOD
01: 4*CPS_PERIOD
11: 16*CPS_PERIOD
Must be 00
3:2 Reserved
1:0 CPS_RAWFILT
00
00
Raw filter coefficient
00: off
01: Low
10: Medium
11: High (Max Filtering)
0x0A CPS_CTRL4
0x0B CPS_CTRL5
R/W 7:0 CPS_AVGTRS
R/W 7:6 CPS_AVGDEB
00000000 Average pos/neg threshold
= 8 x reg
00
Average
bouncer:
00: off
pos/neg
de-
01: 2 samples
10: 4 samples
11: 8 samples
5:3 CPS_AVGNEGFILT
2:0 CPS_AVGPOSFILT
000
Average
coefficient :
000: off
001: Lowest
….
negative
filter
….
111: Highest (Max. Filter)
000
Average
coefficient :
000: off
001: Lowest
.…
positive
filter
…..
111: Highest (Max. Filter)
0x0C CPS_CTRL6
R/W 7:5 Not Used
4:0 CPS_TRS
000
00000
Not Used
Defines
the
touch/prox
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detection threshold for all
sensors. See Table 10
0x0D CPS_CTRL7
R/W
7
6
CPS_CMPAUTOOFF
CPS_CMPTRG
0
0
Disables
compensation trigged by
average
0: compensate channels
independently
1: compensate all channels
when triggered
Detection hysteresis
00: 32
01: 64
10: 128
11: 256
Close debouncer
00: off
the
automatic
5:4 CPS_HYST
00
00
3:2 CPS_CLSDEB
1:0 CPS_FARDEB
01: 2 samples
10: 4 samples
11: 8 samples
Far debouncer
00: off
00
01: 2 samples
10: 4 samples
11: 8 samples
Stuck at timeout timer :
0000 : off
0x0E CPS_CTRL8
R/W 7:4 CPS_STUCK
0000
00XX:
increment
every
CPS_STUCK x 64 active
frames
01XX:
increment
every
CPS_STUCK x 128 active
frames
1XXX: increment every
CPS_STUCK x 256 active
frames
3:0 CPS_CMPPRD
0000
Periodic compensation
0: off
else
:
increment every
CPS_COMPPRD
active frames
x
128
Sensor Readback
0x20 CPSRD
7:2 Not Used
000000 Not Used
00 Determines which sensor
data will be available in the
next Reg read.
R
R
R
R
R
R
R
1:0 CPSRD
0x21 UseMSB
0x22 UseLSB
7:0 SENSUSEMSB
7:0 SENSUSELSB
7:0 SENSAVGMSB
7:0 SENSAVGLSB
7:0 SENSDIFFMSB
7:0 SENSDIFFLSB
00000000 Provides
information for monitoring
purposes. Signed, 2's
complement format
00000000 Provides the
information for monitoring
purposes. Signed, 2's
complement format
00000000 Provides the differential
information for monitoring
purposes. Signed, 2's
complement format
00000000 Offset compensation DAC
the
useful
00000000
0x23 AvgMSB
0x24 AvgLSB
average
00000000
0x25 DiffMSB
0x26 DiffLSB
00000000
0x27 OffMSB
0x28 OffLSB
R/W 7:0 SENSOFFMSB
R/W 7:0 SENSOFFLSB
code. This is writable to
allow forcing some DAC
00000000
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Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
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DATASHEET
codes. When written, the
internal DAC code is
updated after the write of
the LSB reg. MSB and LSB
regs should be written in
sequence.
0x7F I2CSoftReset
W
7:0
SOFTRESET
00000000 Write 0xDE and RESET the
chip
Table 16: Register Overview
6.4 Sensor Design
This section describes how to properly design capacitive sensors for touch or proximity. Sensors can be
designed in a variety of shapes depending on the physical requirements of the system, but to achieve optimum
performance, a careful recognition of the CSG between sensors and below must be given in the design.
An optimum capacitive sensor should have minimum parasitics to both system ground and to the CSG. System
ground parasitics can be minimized with distance between the capacitive sensor and system ground, however
CSG will be directly adjacent to each sensor as well as directly under it (on an adjacent PC board layer). It is
easy to generate a significant capacitance this way and therefore it is recommended to cross-hatch the guard to
a large extent. The recommended “fill” for the cross-hatched area is about 20% metal.
CSx Typ, 4 Plcs.
CSG
CSG
Figure 15: Typical Touch/Proximity Capacitive Sensor
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7 PACKAGING NFORMATION
I
7.1 Package Outline Drawing
Figure 16: Package Outline Drawing
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Ultra Low Power, Capacitive
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7.2 Land Pattern
Figure 17: Package Land Pattern
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Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
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© Semtech 2012
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the
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believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the
publisher for any consequence of its use. Publication thereof does not convey nor imply any license under
patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability
whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair
or improper handling or unusual physical or electrical stress including, but not limited to, exposure to
parameters beyond the specified maximum ratings or operation outside the specified range.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL
APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
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Notice: All referenced brands, product names, service names and trademarks are the property of their
respective owners.
Contact Information
Semtech Corporation
Wireless and Sensing Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
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SX9510EWLTRT
8 Capacitive Buttons, LEDs, IR Decoder and Proximity Controller with Analog Outputs
SEMTECH
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