This product is targeted for DIMMs, incorporating high-speed DDR3 DRAMs where a temperature sensor is needed to monitor overheating of the DIMM. The integrated device can be used in existing board implementations to replace the SPD EEPROM, so upgrading the DIMM for temperature sensing without changing the board layout or the adding more components. The STTS2002 temperature sensor integrates a programmable 12-bit analog-to-digital converter (ADC) which monitors and digitizes the temperature to a resolution of up to 0.25 °C, with an accuracy of +/-1 °C from +75 °C to +95 °C. The device can operate with a supply voltage from 2.3 V to 3.6 V over a -40 °C to 125 °C temperature range. The typical supply current at 3.3 V is 160 µA. The devices are factory calibrated and require no external components to measure temperature.
The open-drain-event output pin is active when the monitored temperature either exceeds a programmed limit or if it strays outside the upper and lower limit of a customer-programmed alarm window. This pin can be configured to operate in either comparator mode for thermostat operation or in interrupt mode. The 2-Kbit serial EEPROM in the STTS2002 is able to permanently lock the data in the lower half (128 bytes). This has been designed specifically for use in DDR DIMMs with SPD.
