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STTS2002
2.3 V memory module temperature sensor with a 2 Kb SPD EEPROM
Data brief
Features
STTS2002 is a 2.3 V memory module temperature sensor with 2 Kb SPD EEPROM forward compatible with JEDEC standard TSE 2002a2 and backward compatible with STTS424E02 Operating temperature range: - -40 C to +125 C Single supply voltage: 2.3 V to 3.6 V 2 mm x 3 mm TDFN8, height: 0.80 mm (max)(a) RoHS compliant, halogen-free

TDFN8 (DN)(a) 2 mm x 3 mm (max height 0.80 mm)
Temperature sensor
2 Kb SPD EEPROM

Temperature sensor resolution: programmable (9-12 bits) 0.25 C (typ)/LSB - (10-bit) default Temperature sensor accuracy (max): - 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: 125 ms (max) at default resolution (10-bit) Typical operating supply current: 160 A (EEPROM standby) Temperature hysteresis selectable set points from: 0, 1.5, 3, 6.0 C Supports SMBus timeout 25 ms - 35 ms
Functionality identical to ST's M34E02 SPD EEPROM Permanent and reversible software data protection for the lower 128 bytes Byte and page write (up to 16 bytes) Self-time WRITE cycle (5 ms, max) Automatic address incrementing

Two-wire bus

Two-wire SMBus/I2C - compatible serial interface Supports up to 400 kHz transfer rate Does not initiate clock stretching
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a. Compliant to JEDEC MO-229, WCED-3
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For further information contact your local STMicroelectronics sales office.
Description
STTS2002
1
Description
The STTS2002 is targeted for DIMM modules in mobile personal computing platforms (laptops), servers and other industrial applications. The thermal sensor (TS) in the STTS2002 is compliant with the JEDEC specification TSE2002a2, which defines memory module thermal sensors requirements for mobile platforms. The 2 Kbit serial presence detect (SPD) I2C-compatible electrically erasable programmable memory (EEPROM) in the STTS2002 is organized as 256 x8 bits and is functionally identical to the industry standard M34E02. 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 2 mm x 3 mm 8-lead TDFN package with a thinner maximum height of 0.80 mm. The DN package is compliant to JEDEC MO-229, variation WCED-3. The digital temperature sensor has a programmable 9-12 bit analog-to-digital converter (ADC) which monitors and digitizes the temperature to a resolution of up to 0.0625 C. The default resolution is 0.25 C/LSB (10-bit). The typical accuracies over these temperature ranges are:

2 C over the full temperature measurement range of -40 C to 125 C 1 C in the +40 C to +125 C active temperature range, and 0.5 C in the +75 C to +95 C monitor temperature range
The temperature sensor in the STTS2002 is specified for operating at supply voltages from 2.3 V to 3.6 V. Operating at 3.3 V, the typical supply current is 160 A (includes SMBus communication current). 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 STTS2002 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 2 Kbit serial EEPROM memory in the STTS2002 has the ability to permanently lock the data in its first half (upper) 128 bytes (locations 00h to 7Fh). This feature 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 STTS2002 the write protection of the memory array is dependent on whether the software protection has been set.
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STTS2002 Figure 1. Logic diagram
VDD SDA(1) SCL A2 A1 A0 STTS2002 EVENT(1)
Description
VSS
1. SDA and EVENT are open drain.
AI12261
Table 1.
Pin 1 2 3 4 5 6 7 8
Signal names
Symbol A0 A1 A2 VSS SDA(1) SCL EVENT(1) VDD Description 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. Supply ground Serial data Serial clock Event output pin. Open drain and active-low. Supply power (2.3 V to 3.6 V) Input/output Input Output Direction Input Input Input
1. SDA and EVENT are open drain.
Figure 2.
TDFN8 connections (top view)
A0 A1 A2 GND 1 2 3 4
8 7 6 5
VDD EVENT(1) SCL SDA(1)
AI12262
1. SDA and EVENT are open drain.
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Description Figure 3. Block diagram
8 VDD
STTS2002
2 Kb SPD EEPROM
Temperature Sensor Logic Control Comparator Timing ADC EVENT 7
Standard array (80h - FFh) Capability Register Configuration Register Temperature Register Software write-protected array (00h - 7Fh) Address Pointer Register
Upper Register Lower Register Critical Register Manufacturer ID Device ID/ Revision
1 2 3
A0 A1 A2 SMBus/I2C Interface
SCL 6 SDA 5
VSS 4
AI12278a
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STTS2002
Temperature sensor registers
2
Temperature sensor registers
The temperature sensor component is comprised of various user-programmable registers. These registers are required to write their corresponding addresses to the pointer register. They can be accessed by writing to their respective addresses (see Table 2). Pointer register bits 7 - 4 must always be written to '0'. This must be maintained, as not setting these bits to '0' may keep the device from performing to specifications. The main registers include the :

Capability register (read-only) Configuration register (read/write) Temperature register (read-only) Temperature trip point registers (read/write), including - - - Alarm temperature upper boundary Alarm temperature lower boundary and Critical temperature

Manufacturer's ID register (read-only) Device ID and device revision ID register (read-only) Temperature resolution register (TRES) (read/write) Temperature sensor registers summary
Register name Address pointer Capability Configuration Alarm temperature upper boundary trip Alarm temperature lower boundary trip Critical temperature trip Temperature Manufacturer's ID Device ID/revision Temperature resolution register B-grade Power-on default Undefined 0x006F 0x0000 0x0000 0x0000 0x0000 Undefined 0x104A 0x0300 0x0001
Table 2.
Address (hex) Not applicable 00 01 02 03 04 05 06 07 08
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Part numbering
STTS2002
3
Part numbering
Table 3.
Example:
Ordering information scheme
STTS2002 B 2 DN 3 F
Device type STTS2002
Accuracy grade B: Maximum accuracy 75 C to 95 C = 1 C
Voltage (minimum) 2 = 2.3 V - 3.6 V part
Package DN = TDFN8 (0.80 mm max height)
Temperature 3 = -40 C to 125 C
Shipping method F = ECOPACK(R) package, tape & reel packing E = ECOPACK(R) package, tube packing
For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you.
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STTS2002
Package marking information
4
Package marking information
Figure 4. DN package topside marking information (TDFN8)
(1) B2DN (2) TSE2 (3) PYWW
ai13907b
1. Temperature grade and package B = B-grade, stacked 2 = Minimum operating voltage of 2.3 V DN = 0.80 mm TDFN package 2. Device name TSE2 = STTS2002 3. Traceability codes P = 2nd digit of plant code Y = Year WW = Work Week
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Revision history
STTS2002
5
Revision history
Table 4.
Date 03-Mar-2010
Document revision history
Revision 1 Initial release. Changes
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STTS2002
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