EVAL-ADM1031EB【PDF 1/32 页】BOARD EVAL FOR ADM1031

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ADM1031

Intelligent Temperature

Monitor and Dual PWM Fan

Controller

The ADM1031 is an ACPI-compliant, three-channel digital

thermometer and under/overtemperature alarm for use in personal

computers and thermal management systems. Optimized for the

Pentium ? III, the part offers a 1 ? C higher accuracy, which allows

system designers to safely reduce temperature guard-banding and

increase system performance.

Two PWM fan control outputs control the speed of two cooling fans

by varying output duty cycle. Duty cycle values between 33% and

100% allow smooth control of the fans. The speed of each fan can be

monitored via TACH inputs, which can be reprogrammed as analog

inputs to allow speeds for 2-wire fans to be measured via sense

resistors. The device also detects a stalled fan. A dedicated fan speed

http://onsemi.com

QSOP ? 16

CASE 492

PIN ASSIGNMENT

control loop provides control 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 measurements, and the fan

PWM_OUT1 1

TACH1/AIN1 2

PWM_OUT2 3

16 SCL

15 SDA

14 INT (SMBALERT)

speed is adjusted to correct any changes in system temperature. Fan

speed can also be controlled using existing ACPI software.

Two inputs (4 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

TACH2/AIN2 4

GND 5

V CC 6

THERM 7

FAN_FAULT 8

ADM1031

13 ADD

12 D2+

11 D2 ?

10 D1+

9 D1 ?

programmabl e INT output to indicate error conditions, and 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.

MARKING DIAGRAM

Features

? Optimized for Pentium ? III

? Reduced Guard-banding Software

? Automatic Fan Speed Control, Independent of CPU Intervention

After Initial Setup

1031A

RQZ

#YYWW

0.125 ? C Resolution on External Temperature Channels

Control Loop to Minimal Acoustic Noise and Battery Consumption

Remote Temperature Measurement Accurate to 1 ? C

Using Remote Diode (Two Channels)

Local Sensor with 0.25 ? C Resolution

Pulse Width Modulation (PWM) Fan Control for 2 Fans

Programmable PWM Frequency and PWM Duty Cycle

Tach Fan Speed Measurement (Two Channels)

1031ARQZ = Specific Device Code

# = Pb-Free Package

YY = Date Code

WW = Work Week

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 31 of this data sheet.

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 3.0 V

to 5.5 V Supply Range

? Shutdown Mode to Minimize Power Consumption

? Limit Comparison of All Monitored Values

? This is a Pb-Free Device

Applications

? Notebook PCs, Network Servers, and Personal

Computers

? Telecommunications Equipment

? Semiconductor Components Industries, LLC, 2012

April, 2012 ? Rev. 5

Publication Order Number:

ADM1031/D

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