Temperature Sensors Meet Latest DRAM Standard

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.