ADM1021A(2012) View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

ADM1021A
(Rev.:2012)

Low Cost Microprocessor System Temperature Monitor Microcomputer

ON Semiconductor 

ADM1021A

Low Cost Microprocessor

System Temperature

Monitor Microcomputer

The ADM1021A is a two-channel digital thermometer and

under/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 can be provided on-chip with

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 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 ADM1021A communicates over a two-wire serial interface

compatible with SMBus standards. Under/overtemperature limits can

be programmed into the device over the serial bus, and an ALERT

output signals when the on-chip or remote temperature is out of range.

This output can be used as an interrupt or as an SMBus alert.

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 Over/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

 3.0 V to 5.5 V Supply

 Small 16-lead QSOP Package

 This Device is Pb-Free, Halogen Free and is RoHS Compliant

Applications

 Desktop Computers

 Notebook Computers

 Smart Batteries

 Industrial Controllers

 Telecom Equipment

 Instrumentation

http://onsemi.com

QSOP 16

CASE 492

PIN ASSIGNMENT

NC 1

VDD 2

D+ 3

D− 4

NC 5

ADD1 6

GND 7

GND 8

ADM1021A

(Top View)

16 NC

15 STBY

14 SCLK

13 NC

12 SDATA

11 ALERT

10 ADD0

9 NC

NC = No Connect

MARKING DIAGRAM

1021AA

RQZ

YYWWG

1021AARQZ = Specific Device Code

YY

= Year

WW

= Work Week

G

= Pb-Free Package

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 15 of this data sheet.

 Semiconductor Components Industries, LLC, 2012

1

July, 2012 − Rev. 9

Publication Order Number:

ADM1021A/D

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