For monitoring DIMM temperature in PCs, the STTS424 temperature sensors are fully compliant with the latest JEDEC JC42.4 specification for DDR2 and DDR3 DRAM modules. The STTS424 is a standalone digital temperature sensor, while the STTS424E02 integrates a temperature sensor with a 2-Kb serial presence detect EEPROM to store timing parameters and other information about the module. Both devices communicate with the CPU chipset through an I2C/SMBus-compatible serial bus and are available in 2 mm x 3 mm DFN8 and 4.4 mm x 3mm TSSOP8 packages. Shared features include an a/d converter that monitors and digitizes the temperature with a resolution down to 0.25°C and an accuracy of ±1°C over a temperature range from +75°C to +95 °C. The devices are factory calibrated, require no external components, and operate on a supply voltage from 2.7V to 3.6V over a -40°C to +125°C temperature range. Prices for the STTS424 and STTS424E02 are $0.70 and $0.85 each, respectively, in volume. For more details, call STMICROELECTRONICS, Lexington, MA. (888) 787-3550.
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