REV. 0

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a

ADM9240

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., 1998

Low Cost Microprocessor

System Hardware Monitor

FUNCTIONAL BLOCK DIAGRAM

BANDGAP

TEMPERATURE

SENSOR

FAN1

SCL

SDA

A1

NTEST_OUT/A0

FAN2

CI

INT

NTEST_IN/AOUT

RESET

VID0

VID1

VID2

VID3

VID4

VID0 - 3 AND

FAN DIVISOR

REGISTERS

VID4 AND

DEVICE ID

REGISTER

INPUT

ATTENUATORS

AND

ANALOG

MULTIPLEXER

FAN SPEED

COUNTER

ADDRESS

POINTER

REGISTER

TEMPERATURE

CONFIGURATION

REGISTER

9-BIT ADC

SERIAL BUS

ADDRESS

REGISTER

ADM9240

LIMIT

COMPARATORS

INTERRUPT

STATUS

REGISTERS

INT MASK

REGISTERS

CHASSIS

INTRUSION

CLEAR REGISTER

SERIAL BUS

INTERFACE

ANALOG

OUTPUT REGISTER

AND 8-BIT DAC

VALUE AND LIMIT

REGISTERS

CONFIGURATION

REGISTER

GNDA

GNDD

FEATURES

Six Direct Voltage Measurement Inputs (Including Two

Processor Core Voltages) with On-Chip Attenuators

On-Chip Temperature Sensor

Five Digital Inputs for VID Bits

Fully Supports Intel’s LANDesk Client Manager (LDCM)

Register-Compatible with LM7x Products

Two Fan Speed Monitoring Inputs

Chassis Intrusion Detect

Interrupt Output

Programmable RESET I/O Pin

Shutdown Mode to Minimize Power Consumption

Limit Comparison of all Monitored Values

APPLICATIONS

Network Servers and Personal Computers

Microprocessor-Based Office Equipment

Test Equipment and Measuring Instruments

PRODUCT DESCRIPTION

The ADM9240 is a complete system hardware monitor for

microprocessor-based systems, providing measurement and

limit comparison of up to four power supplies and two proces-

sor core voltages, plus temperature, two fan speeds and chassis

intrusion. Measured values can be read out via an I

ible serial System Management Bus, and values for limit com-

parisons can be programmed in over the same serial bus. The

high speed successive approximation ADC allows frequent

sampling of all analog channels to ensure a fast interrupt

response to any out-of-limit measurement.

The ADM9240’s 2.85 V to 5.75 V supply voltage range, low

supply current and I

wide range of applications. These include hardware monitoring

and protection applications in personal computers, electronic

test equipment and office electronics.

I