ADM1031 datasheet(1/32 Pages) AD

部件名	ADM1031

功能描述	Intelligent Temperature Monitor and Dual PWM Fan Controller

PDF	32 Pages

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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REV. 0

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.

a

ADM1031

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

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

Intelligent Temperature

Monitor and Dual PWM Fan Controller

FUNCTIONAL BLOCK DIAGRAM

SERIAL BUS

INTERFACE

INTERRUPT

STATUS

REGISTERS

VALUE AND LIMIT

REGISTERS

OFFSET

REGISTERS

CONFIGURATION

REGISTERS

LIMIT

COMPARATOR

2.5V

BANDGAP

REFERENCE

ANALOG

MULTIPLEXER

BANDGAP

TEMPERATURE

SENSOR

SLAVE

ADDRESS

REGISTER

ADD

SDA

SCL

GND

ADM1031

FAN FILTER

REGISTER

FAN

CHARACTERISTICS

REGISTERS

FAN SPEED

COUNTER

ADDRESS

POINTER

REGISTER

PWM

CONTROLLERS

TACH SIGNAL

CONDITIONING

INT (SMBALERT)

THERM

FAN_FAULT

PWM_OUT1

TACH1 /AIN1

D1+

D1–

VCC

ADC

FAN SPEED

CONFIG

REGISTER

TACH2 /AIN2

PWM_OUT2

D2+

D2–

FEATURES

Optimized for Pentium® III: Allows Reduced Guardbanding

Software and Automatic Fan Speed Control

Automatic Fan Speed Control Allows Control Indepen-

dent of CPU Intervention after Initial Setup

Control Loop Minimizes Acoustic Noise and Battery

Consumption

Remote Temperature Measurement Accurate to 1 C

Using Remote Diode (Two Channels)

0.125 C Resolution on External Temperature Channels

Local Temperature Sensor with 0.25 C Resolution

Pulsewidth Modulation Fan Control (PWM) for Two Fans

Programmable PWM Frequency

Programmable PWM Duty Cycle

Tach Fan Speed Measurement (Two Channels)

Analog Input To Measure Fan Speed of 2-Wire Fans

(Using Sense Resistor)

2-Wire System Management Bus (SMBus) with ARA

Support

Overtemperature

THERM Output Pin for CPU Throttling

Programmable

INT Output Pin

Configurable Offsets for Temperature Channels

3 V to 5.5 V Supply Range

Shutdown Mode to Minimize Power Consumption

Limit Comparison of All Monitored Values

APPLICATIONS

Notebook PCs, Network Servers and Personal Computers

Telecommunications Equipment

PRODUCT DESCRIPTION

The ADM1031 is an ACPI-compliant three-channel digital

thermometer and under/over temperature alarm, for use in

personal computers and thermal management systems. Opti-

mized for the Pentium III, the higher 1

°C accuracy offered

allows systems designers to safely reduce temperature guard-

banding and increase system performance. Two Pulsewidth

Modulated (PWM) Fan Control outputs control the speed of

two cooling fans by varying output duty cycle. Duty cycle values

between 33%–100% allow smooth control of the fans. The speed

of each fan can be monitored via TACH inputs. The TACH

inputs may be reprogrammed as analog inputs, allowing fan

speeds for 2-wire fans to be measured via sense resistors. The

device will also detect a stalled fan. A dedicated Fan Speed

Control Loop provides control even without the intervention of

CPU software. It also ensures that if the CPU or system locks up,

each fan can still be controlled based on temperature measure-

ments, and the fan speed adjusted to correct any changes in

system temperature. Fan speed may also be controlled using

existing ACPI software. Two inputs (four pins) are dedicated to

remote temperature-sensing diodes with an accuracy of

±1°C,

and an on-chip temperature sensor allows ambient temperature

to be monitored. The device has a programmable

INT output

to indicate error conditions. There is a dedicated

FAN_FAULT

output to signal fan failure. The

THERM pin is a fail-safe output

for overtemperature conditions that can be used to throttle a

CPU clock.

*Patents pending.

Pentium is a registered

trademark of Intel Corporation.

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