 Semiconductor Components Industries, LLC, 2012

April, 2012 − Rev. 10

1

Publication Order Number:

ADM1023/D

ADM1023

ACPI‐Compliant, High

Accuracy Microprocessor

System Temperature Monitor

The ADM1023 is a 2-channel digital thermometer and

under/overtemperature alarm for use in personal computers and other

systems requiring thermal monitoring and management. Optimized

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

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 ADM1023 communicates over a 2-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

Applications

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

http://onsemi.com

See detailed ordering and shipping information in the package

dimensions section on page 15 of this data sheet.

ORDERING INFORMATION

MARKING DIAGRAM

QSOP 16

CASE 492

PIN ASSIGNMENT

ADM1023

(Top View)

NC

STBY

SCLK

NC

SDATA

ALERT

ADD0

NC

NC

D+

D−

NC

ADD1

GND

GND

16

1

2

3

4

5

6

7

8

15

14

13

12

11

10

9

1023ARQZ = Specific Device Code

YY

= Year

WW

= Work Week

G

= Pb-Free Package

1023A

RQZ

YYWWG