STTS424E02CDW6F [STMICROELECTRONICS]
Memory module temperature sensor with a 2Kb SPD EEPROM; 内存模块温度传感器，一个2Kb的SPD EEPROM
| 型号： | STTS424E02CDW6F |
| 厂家： | 
ST |
| 描述： | Memory module temperature sensor with a 2Kb SPD EEPROM |
| 文件： | 总7页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
STTS424E02
Memory module temperature sensor
with a 2Kb SPD EEPROM
Data Brief
Features
■ Temperature sensor compliant with JEDEC
JC42.4, integrated with 2Kbit Serial Presence
Detect (SPD) EEPROM.
Temperature sensor
■ Temperature sensor resolution:
0.25°C (typ)/LSB
DFN8 (DA)
2mm x 3mm
■ Temperature sensor accuracy:
–
–
–
1°C from +75°C to +95°C
2°C from +40°C to +125°C
3°C from –40°C to +125°C
■ ADC conversion time: 125ms (max)
■ Supply voltage: 2.7V to 3.6 V
■ Maximum operating supply current: 200µA
TSSOP8 (DW)
4.4mm x 3mm
■ Hysteresis selectable set points from: 0, 1.5, 3,
6.0°C
■ Ambient temperature sensing range: -40°C to
+125°C
Two-wire bus
2
2Kb SPD EEPROM
■ 2-Wire SMBus/I C -compatible serial interface
■ Functionality identical to ST’s M34E02 SPD
■ Supports up to 100kHz transfer rate
EEPROM
Packages
■ Permanent and reversible software data
protection for the lower 128 bytes
■ 2mm x 3mm DFN8, height: 0.85mm (typ)
(a)
■ Single supply voltage: 2.7V to 3.6V
■ Byte and page write (up to 16 bytes)
■ Self-time WRITE cycle (5ms, max)
■ Automatic address incrementing
■ 4.4mm x 3mm TSSOP8
■ Halogen-free, lead-free
■ More than 1 million erase/WRITE cycles
■ Operating temperature range: -40°C to +85°C
a. Contact local ST sales office for availability.
August 2007
Rev 1
1/7
For further information contact your local STMicroelectronics sales office.
www.st.com
1
Description
STTS424E02
Description
The STTS424E02 is targeted for DIMM Modules in Mobile Personal Computing Platforms
(Laptops), Server Memory Modules and other industrial applications. The Thermal Sensor
(TS) in the STTS424E02 is fully compliant with the JEDEC 42.4 specification, which defines
Memory Module Thermal Sensors requirements for Mobile platforms. The 2Kbit Serial
2
Presence Detect (SPD) I C-compatible Electrically Erasable Programmable Memory
(EEPROM) in the STTS424E02 is organized as 256 x8 bits and is functionally identical to
the industry standard M34E02.
Ambient temperature sensing range for the temperature sensor is -40°C to +125°C per
JC42.4 specifications. The operating temperature range for the SPD EEPROM is
guaranteed for -40°C to +85°C.
The TS-SPD EEPROM combination provides space as well as cost savings for Mobile and
Server Platform Dual Inline Memory Modules (DIMM) manufacturers, as it is packaged in
the compact 2mm x 3mm 8-lead DFN package which has a height that will not exceed
0.9mm. It is also available in the JEDEC compliant TSSOP8 package.
The temperature sensor includes a band gap-based temperature sensor and 10-bit Analog-
to-Digital Converter (ADC) which monitor and digitize the temperature to a resolution of up
to 0.25°C. The typical accuracies over these temperature ranges are:
●
●
●
3°C (max) over the full temperature measurement range of –40°C to 125°C,
2°C in the +40°C to +125°C temperature range, and
1°C in the +75°C to +95°C temperature range.
The temperature sensor in the STTS424E02 is specified for operating at supply voltages
from 2.7V to 3.6V. Operating at 3.3V, the supply current is 100µA (typ).
The on-board sigma delta ADC converts the measured temperature to a digital value that is
calibrated in °C. For Fahrenheit applications, a lookup table or conversion routine is
required. The STTS424E02 is factory-calibrated and requires no external components to
measure temperature.
The digital temperature sensor component has user-programmable registers that provide
the capabilities for DIMM temperature-sensing applications. The open drain Event output pin
is active when the monitoring temperature exceeds a programmable limit, or it falls above or
below an alarm window. The user has the option to set the Event output as a critical
temperature output. This pin can be configured to operate in either a comparator mode for
thermostat operation or in interrupt mode.
The 2Kbit serial EEPROM memory in the STTS424E02 has the ability to permanently lock
the data in its first half (upper) 128 bytes (locations 00h to 7Fh). This facility has been
designed specifically for use in DRAM DIMMs with SPD. All of the information concerning
the DRAM module configuration (e.g. access speed, size, and organization) can be kept
write protected in the first half of the memory. The second half (lower) 128 bytes of the
memory can be write protected using two different software write protection mechanisms.
By sending the device a specific sequence, the first 128 bytes of the memory become write
protected: permanently or resettable. In the STTS424E02 the EEPROM Write Control (WC)
is always held low. Thus, the write protection of the memory array is dependent on whether
the software protection has been set.
2/7
STTS424E02
Figure 1.
Description
Logic diagram
V
DD
(1)
(1)
SDA
SCL
EVENT
STTS424E02
A
A
A
2
1
0
V
SS
AI12261
1. SDA and EVENT are open drain.
Table 1.
Pin
Signal names
Symbol
Description
Direction
1
2
3
4
5
6
7
8
A0
A1
Serial Bus Address selection pin. Can be tied to VSS or VDD
Serial Bus Address selection pin. Can be tied to VSS or VDD
Serial Bus Address selection pin. Can be tied to VSS or VDD
.
Input
Input
Input
.
A2
.
VSS
SDA(1)
SCL
Supply ground
Serial Data
Input/output
Input
Serial Clock
EVENT(1) Event output pin. Open drain and active-low
Output
VDD Supply power (2.7V to 3.6V)
1. SDA and EVENT are open drain.
Figure 2.
Connections (DFN8 and TSSOP8)
V
DD
A0
A1
1
2
3
4
8
7
6
5
(1)
EVENT
SCL
A2
(1)
GND
SDA
AI12262
1. SDA and EVENT are open drain.
3/7
Description
STTS424E02
Figure 3.
Block diagram
8
V
DD
Temperature
Sensor
EVENT
7
Logic Control
Comparator
Timing
ADC
Capability
Register
Upper
Register
Configuration
Register
Lower
Register
Temperature
Register
Critical
Register
Manufacturer
ID
Address Pointer
Register
2Kb SPD EEPROM
Software Write Protect
Device ID/
Revision
WC
E0 E1 E2
V
SS
SCL
6
A0
1
2
3
2
A1
A2
SMBus/I C
Interface
SDA
5
V
SS
4
AI12278a
4/7
STTS424E02
Part numbering
Part numbering
Table 2.
Ordering information scheme
STTS424E02
Example:
C
DA
6
F
Device type
STTS424E02
Grade
C: Maximum accuracy 75°C to 95°C = ± ±2°C
B: Maximum accuracy 75°C to 95°C = ± ±1°C(1)
Package
DA = DFN8
DW = TSSOP8 (4.4mm x 3 mm body size)(1)
Temperature
-40°C to 85°C
Shipping method
F = ECOPACK package, tape & reel packing
E = ECOPACK package, tube packing
1. Contact local ST sales office for availability.
For other options, or for more information on any aspect of this device, please contact the
ST sales office nearest you.
5/7
Revision history
STTS424E02
Revision history
Table 3.
Date
03-Aug-2007
Revision history
Revision
Changes
1
Initial release.
6/7
STTS424E02
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