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.

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

Temperature sensor
■ 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)
■ Temperature hysteresis selectable set points from: 0, 1.5, 3, 6.0 °C
■ Supports SMBus timeout 25 ms - 35 ms

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

Two-wire bus
■ Two-wire SMBus/I2C - compatible serial interface
■ Supports up to 400 kHz transfer rate
■ Does not initiate clock stretching