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 ■ ■ 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 ■ 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 µA (EEPROM standby) ■ ■ Two-wire bus ■ Temperature hysteresis selectable set points from: 0, 1.5, 3, 6.0 °C Two-wire SMBus/I2C - compatible serial interface ■ Supports up to 400 kHz transfer rate Supports SMBus timeout 25 ms - 35 ms ■ Does not initiate clock stretching a. Compliant to JEDEC MO-229, WCED-3 March 2010 Doc ID 17216 Rev 1 For further information contact your local STMicroelectronics sales office. 1/9 www.st.com 1 Description 1 STTS2002 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 µA (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. 2/9 Doc ID 17216 Rev 1 STTS2002 Description Figure 1. Logic diagram VDD SDA(1) EVENT(1) SCL A2 A1 A0 STTS2002 VSS AI12261 1. SDA and EVENT are open drain. Table 1. Signal names Pin Symbol Description Direction 1 A0 Serial bus address selection pin. Can be tied to VSS or VDD. Input 2 A1 Serial bus address selection pin. Can be tied to VSS or VDD. Input 3 A2 Serial bus address selection pin. Can be tied to VSS or VDD. Input 4 VSS Supply ground 5 SDA(1) Serial data Input/output 6 SCL Serial clock Input 7 EVENT(1) Event output pin. Open drain and active-low. Output 8 VDD Supply power (2.3 V to 3.6 V) 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. Doc ID 17216 Rev 1 3/9 Description Figure 3. STTS2002 Block diagram 8 VDD 2 Kb SPD EEPROM Temperature Sensor Logic Control Comparator Timing EVENT 7 ADC 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 SCL A0 A1 A2 6 SMBus/I2C Interface SDA 5 VSS 4 4/9 Doc ID 17216 Rev 1 AI12278a STTS2002 2 Temperature sensor registers 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) Table 2. Temperature sensor registers summary Address (hex) Not applicable Register name Power-on default Address pointer Undefined 00 Capability B-grade 0x006F 01 Configuration 0x0000 02 Alarm temperature upper boundary trip 0x0000 03 Alarm temperature lower boundary trip 0x0000 04 Critical temperature trip 0x0000 05 Temperature 06 Manufacturer’s ID 0x104A 07 Device ID/revision 0x0300 08 Temperature resolution register 0x0001 Undefined Doc ID 17216 Rev 1 5/9 Part numbering 3 STTS2002 Part numbering Table 3. Ordering information scheme Example: 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® package, tape & reel packing E = ECOPACK® package, tube packing For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you. 6/9 Doc ID 17216 Rev 1 STTS2002 4 Package marking information 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 Doc ID 17216 Rev 1 7/9 Revision history 5 STTS2002 Revision history Table 4. 8/9 Document revision history Date Revision 03-Mar-2010 1 Changes Initial release. Doc ID 17216 Rev 1 STTS2002 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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