ADM1023ARQ 查看數據表（PDF） - Analog Devices

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ADM1023ARQ

ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor

Analog Devices 

a

ACPI-Compliant

High-Accuracy Microprocessor

System Temperature Monitor

ADM1023*

FEATURES

Next Generation Upgrade to 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/Under Temperature Limits

Programmable Conversion Rate

Supports System Management Bus (SMBus) Alert

2-Wire SMBus Serial Interface

200 ␮A Max Operating Current (0.25 Conversions/

Seconds)

1 ␮A Standby Current

3 V to 5.5 V Supply

Small 16-Lead QSOP Package

APPLICATIONS

Desktop Computers

Notebook Computers

Smart Batteries

Industrial Controllers

Telecomms Equipment

Instrumentation

PRODUCT DESCRIPTION

The ADM1023 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.

Optimized for the Pentium® III; the higher accuracy offered

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-con-

nected 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 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 tem-

perature of the device and its environment.

The ADM1023 communicates over a 2-wire serial interface

compatible with SMBus standards. Under and over tempera-

ture 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.

FUNCTIONAL BLOCK DIAGRAM

ON-CHIP

TEMPERATURE

SENSOR

LOCAL TEMPERATURE

VALUE REGISTER

D+

ANALOG

A-TO-D

D–

MUX

CONVERTER

BUSY RUN/STANDBY

REMOTE TEMPERATURE

VALUE REGISTERS

EXTERNAL DIODE OPEN-CIRCUIT

ADM1023

LOCAL TEMPERATURE

LOW-LIMIT COMPARATOR

LOCAL TEMPERATURE

HIGH-LIMIT COMPARATOR

REMOTE TEMPERATURE

LOW-LIMIT COMPARATOR

REMOTE TEMPERATURE

HIGH-LIMIT COMPARATOR

STATUS REGISTER

ADDRESS POINTER

REGISTER

ONE-SHOT

REGISTER

CONVERSION RATE

REGISTER

OFFSET

REGISTERS

LOCAL TEMPERATURE

LOW-LIMIT REGISTER

LOCAL TEMPERATURE

HIGH-LIMIT REGISTER

REMOTE TEMPERATURE

LOW-LIMIT REGISTERS

REMOTE TEMPERATURE

HIGH-LIMIT REGISTERS

CONFIGURATION

REGISTER

INTERRUPT

MASKING

SMBUS INTERFACE

STBY

ALERT

NC VDD NC GND GND NC NC

*Patents pending.

Pentium is a registered trademark of Intel Corporation.

REV. A

NC

NC = NO CONNECT

SDATA

SCLK

ADD0

ADD1

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

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