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Description:0.3-6V; 650mW; low-cost microprocessor system temperature monitor. For desktop computers, notebook computers, smart batteries, industrial controllers, telecomms equipment and instrumentation
Manufacturer:Analog Devices
Oper. temp.:0 to 100
Datasheet:PDF (163K).
Click here to download *)

The ADM1021A is a two-channel digital thermometer and under/ over temperature alarm, intended for use in personal computers and other systems requiring thermal monitoring and management. The device can measure the temperature of a microprocessor using a diode-connected PNP transistor, which may be provided on-chip in the case of the Pentium III or similar processors, or can be a low-cost discrete NPN/PNP device such as the 2N3904/2N3906. A novel measurement technique cancels out the absolute value of the transistor's base emitter voltage, so that no calibration is required. The second measurement channel measures the output of an on-chip temperature sensor, to monitor the temperature of the device and its environment. The ADM1021A communicates over a two-wire serial interface compatible with SMBus standards. Under and over temperature limits can be programmed into the devices over the serial bus, and an A LERT o utput signals when the on-chip or remote temperature is out of range. This output can be used as an interrupt, or as an SMBus alert.

Click here to download ADM1021AARQ Datasheet
Click here to download ADM1021AARQ Datasheet
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