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ADM1023ARQZ-REEL

ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor

ON Semiconductor 

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

for the Pentium® III, the higher accuracy allows systems designers to

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 provided on−chip with the Pentium III or similar processors; or it

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 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

• Next Generation Upgrade of ADM1021

• On−Chip and Remote Temperature Sensing

• Offset Registers for System Calibration

• 1°C Accuracy and Resolution on Local Channel

• 0.125°C Resolution/1°C Accuracy on Remote Channel

• Programmable Over/Undertemperature Limits

• Programmable Conversion Rate

• Supports System Management Bus (SMBus) ALERT

• 2−Wire SMBus Serial Interface

• 200 mA Max Operating Current (0.25 Conversions/Second)

• 1 mA Standby Current

• 3.0 V to 5.5 V Supply

• Small 16−Lead QSOP Package

• Pb−Free Packages are Available

APPLICATIONS

• Desktop Computers

• Notebook Computers

• Smart Batteries

• Industrial Controllers

• Telecomm Equipment

• Instrumentation

http://onsemi.com

QSOP−16

CASE 492

MARKING DIAGRAM

1

1023A

RQZ

#YYWW

XXX

xxx = Specific Device Code

#

= Pb−Free Package

YYWW = Date Code

XXX = Assembly Lot ID

NC 1

VDD 2

D+ 3

D– 4

NC 5

ADD1 6

GND 7

GND 8

ADM1023

TOP VIEW

16 NC

15 STBY

14 SCLK

13 NC

12 SDATA

11 ALERT

10 ADD0

9 NC

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 15 of this data sheet.

© Semiconductor Components Industries, LLC, 2010

1

May, 2010 − Rev. 9

Publication Order Number:

ADM1023/D

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