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ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor
ON Semiconductor Corp

The ADM1023 is a 2-channel digital thermometer and under- and overtemperature alarm for use in personal computers and other systems requiring thermal monitoring and management. Optimized for the Pentium? III, the higher accuracy allows systems designers to safely reduce temperature guard banding and increase system performance. The device can measure the temperature of a microprocessor using a diode-connected PNP transistor, which may be provided on-chip with the Pentium III or similar processors; or it 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.
Next generation upgrade of ADM1021 On-chip and remote temperature sensing Offset registers for system calibration 1C accuracy and resolution on local channel 0.125C resolution/1C accuracy on remote channel Programmable over/under temperature limits Programmable over/under temperature limits 2-wire SMBus serial interface 200 ?A max operating current (0.25 conversions/second) 1 ?A standby current 3 V to 5.5 V supply

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