ADM1021AARQ

Product Summary

PRODUCT DESCRIPTION
The ADM1021A is a two-channel digital thermometer and undertemperature/overtemperature 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 cancelsout 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. Undertemperature and
overtemperature limits can be programmed into the devices over the serial bus, and an ALERT output signals when the on-chipor remote temperature is out of range. This output can be used
as an interrupt, or as an SMBus alert

Parametrics

ABSOLUTE MAXIMUM RATINGS*
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
SCLK, SDATA, ALERT, STBY . . . . . . . . . . .  –0.3 V to +6 V
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
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 10 sec) . . . . . . . . . . . . . 300°C
IR Reflow Peak Temperature . . . . . . . . . . . . . . . . . . . . . 220℃

Features

FEATURES
Alternative to the ADM1021
On-Chip and Remote Temperature Sensing
No Calibration Necessary
1 C Accuracy for On-Chip Sensor
3 C Accuracy for Remote Sensor
Programmable Overtemperature/Undertemperature
Limits
Programmable Conversion Rate
2-Wire SMBus Serial Interface
Supports System Management Bus (SMBus) Alert
200 mA Max Operating Current
1 mA Standby Current
3 V to 5.5 V Supply
Small 16-Lead QSOP Package

Diagrams