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FEATURES On-Chip and Remote Temperature Sensing No Calibration Necessary 1؇C Accuracy for On-Chip Sensor 3؇C Accuracy ...
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FEATURES On-Chip and Remote Temperature Sensing No Calibration Necessary 1؇C Accuracy for On-Chip Sensor 3؇C Accuracy for Remote Sensor Programmable Over/Under Temperature Limits Programmable Conversion Rate 2-Wire SMBus™ Serial Interface Supports SMBus Alert 70 A Max Operating Current 3 A Standby Current +3 V to +5.5 V Supply 8-Lead SOIC Package APPLICATIONS Desktop Computers Notebook Computers Smart Batteries Industrial Controllers Telecommunication Equipment Instrumentation
8-Lead, Low-Cost, System Temperature Monitor ADM1020
PRODUCT DESCRIPTION
The ADM1020 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 NPN or PNP transistor, which may be provided on-chip in the case of the Pentium® II or similar processors, or can be a low-cost discrete device such as the 2N3904. 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 ADM1020 communicates over a two-wire serial interface compatible with System Management Bus (SMBus) standards. Under and over temperature limits can be programmed into the devices over the serial bus, and an ALERT o...
