Analog Devices ADM1021
The ADM1021 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® II or similar processors, or can be a low cost discrete NPN/PNP device such as the 2N3904/2N3906. The second measurement channel measures the output of an on-chip temperature sensor, to monitor the temperature of the device and its environment.| Part No. | ADM1021 |
|---|---|
| Datasheet | ADM1021 Download |
| Manufacturer |  Analog Devices |
| Description | Low Cost Microprocessor System Temperature Monitor |
| Buy | Stock & Price |
FEATURES
Improved Replacement for MAX1617 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 System Management Bus (SMBus™) Alert 70●A Max Operating Current 3
● A Standby Current 3 V to 5.5 V Supply Small 16-Lead QSOP Package
APPLICATIONS
Desktop Computers Notebook Computers Smart Batteries Industrial Controllers Telecomms Equipment Instrumentation Low Cost Microprocessor System Temperature Monitor ADM1021 PRODUCTDESCRIPTION
A novel measurement technique cancels out the absolute value of the transistor’s base emitter voltage, so that no calibration is required. The ADM1021 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 ALERT output signals when the on-chip or remote temperature is out of range.
