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. 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.
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Desktop ComputersNotebook ComputersSmart BatteriesIndustrial ControllersTelecomms EquipmentInstrumentation
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Improved Replacement for MAX1617On-Chip and Remote Temperature SensingNo Calibration Necessary18C Accuracy for On-Chip Sensor38C Accuracy for Remote SensorProgrammable Over/Under Temperature LimitsProgrammable Conversion Rate2-Wire SMBus Serial InterfaceSupports System Management Bus (SMBus™) Alert70 mA Max Operating Current3 mA Standby Current3 V to 5.5 V SupplySmall 16-Lead QSOP Package
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Positive Supply Voltage (VDD) to GND . . . . . .0.3 V to +6 V
D+, ADD0, ADD1 . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
D to GND . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +0.6 V
Input Current, D . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 mA
ESD Rating, all pins (Human Body Model) . . . . . . . . 2000 V
Continuous Power Dissipation
Up to +70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW
Derating above +70°C . . . . . . . . . . . . . . . . . . . 6.7 mW/°C
Operating Temperature Range . . . . . . . .55°C to +125°C
Maximum Junction Temperature (TJ max) . . . . . . .. +150°C
Storage Temperature Range . . . . . . . . . 65°C to +150°C
Lead Temperature, Soldering
Vapor Phase 60 sec . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared 15 sec . . . . . . . . . . . . . . . . . . . . . . . . . . +200°C
Post a Buying Lead
Required Field 
