Date: 15/03/2010

Integrated serial presence detect EEPROM memory and temperature-monitoring IC

ST Microelectronics has introduced the STTS2002, an integrated Serial Presence Detect (SPD) EEPROM memory and temperature-monitoring IC. The protection device meets the latest JEDEC TSE2002 standard for DDR3 DRAM modules.

The temperature sensor inside STTS2002 enables the CPU and chipset in the system to apply Closed-Loop Thermal Throttling (CLTT) when the temperature of the DDR3 DIMM modules exceeds a pre-programmed threshold value. The CLTT prevents overheating of the memory modules. CLTT dynamically slows data transactions if excessive temperature is detected. This reduces the memory's power consumption until the temperature returns to within an acceptable range.

The STTS2002 meets the form, function and performance requirements of JEDEC TSE2002, communicating SPD and temperature data over an industry-standard System Management Bus (SMBus) interface. ST says this device by consuming 30% less current than competing devices, it can be implemented with lower impact on the overall system power budget.

Key features of the STTS2002 are:
0.25°C temperature resolution
±1°C accuracy over specified temperature range (+75°C to +95°C)
2.3 to 3.6V operation
2Kbit serial SPD EPPROM: non-modifiable in end-user application
Same 2 x 3mm TDFN 8-pin package and pinout as JEDEC-specified SPD-only IC
SMBus 2.0 Timeout protocol support
Multi-mode, open-drain EVENT output pin
Functionally and plug-in backwards compatible to the STTS424E02 in existing applications

STTS2002 is available for immediate sampling and production delivery, in the JEDEC-specified 2x3x0.8mm TDFN8 package. Pricing begins at $0.40 for orders over 10,000 pieces.

Further information is available at www.st.com/temp-sensors