ADM1031

更新时间： 2024-11-18 11:56:07

品牌	Logo	应用领域
安森美 - ONSEMI		风扇监控控制器
页数	文件大小	规格书
30页	294K
描述
Intelligent Temperature Monitor and Dual PWM Fan Controller

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ADM1031 数据手册

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

PentiumRIII, the part offers a 1°C higher accuracy, which allows

system designers to safely reduce temperature guard−banding and

increase system performance.

http://onsemi.com

QSOP−16

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

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

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

speed can also be controlled using existing ACPI software.

CASE 492

MARKING DIAGRAM

1031A

RQZ

#YYWW

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

programmable 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.

xxx

= Specific Device Code

= Pb−Free Package

= Date Code

= Work Week

PIN ASSIGNMENT

PWM_OUT1

TACH1/AIN1

PWM_OUT2

TACH2/AIN2

GND

SCL

Features

• Optimized for Pentium III

15 SDA

ADM1031

INT(SMBALERT)

♦ Reduced Guard−banding Software

♦ Automatic Fan Speed Control, Independent of CPU

Intervention After Initial Setup

ADD

D2+

D2–

D1+

D1–

• 0.125°C Resolution on External Temperature Channels

• Control Loop to Minimal Acoustic Noise and Battery

Consumption

THERM

FAN_FAULT

• Remote Temperature Measurement Accurate to 1°C

Using Remote Diode (Two Channels)

• Local Sensor with 0.25°C Resolution

• Overtemperature THERM Output Pin for CPU

Throttling

• Pulse Width Modulation (PWM) Fan Control for 2 Fans

• Programmable PWM Frequency and PWM Duty Cycle

• Tach Fan Speed Measurement (Two Channels)

• Programmable INT Output Pin

• Configurable Offsets for Temperature Channels 3.0 V

to 5.5 V Supply Range

• Analog Input to Measure Fan Speed of 2−Wire Fans

• Shutdown Mode to Minimize Power Consumption

• Limit Comparison of All Monitored Values

• This is a Pb−Free Device

(Using Sense Resistor)

• 2−Wire System Management Bus (SMBus) with ARA

Support

Applications

• Notebook PCs, Network Servers, and Personal Computers

• Telecommunications Equipment

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 29 of this data sheet.

Publication Order Number:

May, 2010 − Rev. 4

ADM1031/D

12 3 4 5 6 7...30

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与ADM1031相关器件

型号	品牌	获取价格	描述	数据表
ADM1031ARQ	ADI	获取价格	Intelligent Temperature Monitor and Dual PWM Fan Controller
ADM1031ARQ-REEL	ONSEMI	获取价格	Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECT
ADM1031ARQZ	ONSEMI	获取价格	Intelligent Temperature Monitor and Dual PWM Fan Controller
ADM1031ARQZ-R7	ONSEMI	获取价格	Intelligent Temperature Monitor and Dual PWM Fan Controller
ADM1031ARQZ-R7	ROCHESTER	获取价格	DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT, LEAD FREE, QSOP-16
ADM1031ARQZ-REEL	ONSEMI	获取价格	Intelligent Temperature Monitor and Dual PWM Fan Controller
ADM1032	ADI	获取价格	+-1C Remote and Local System Temperature Monitor
ADM1032	ONSEMI	获取价格	Â±1â Remote and Local System Temperature Mo
ADM1032_12	ONSEMI	获取价格	1C Remote and Local System Temperature Monitor Supports SMBus Alert
ADM1032AR	ADI	获取价格	+-1C Remote and Local System Temperature Monitor

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