ADT7490ARQZ-REEL

更新时间： 2024-01-29 05:55:21

品牌	Logo	应用领域
安森美 - ONSEMI		风扇光电二极管监控控制器
页数	文件大小	规格书
75页	652K
描述
dBCool Remote Thermal Monitor and Fan Controller with PECI Interface

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ADT7490ARQZ-REEL 数据手册

ADT7490

dBCool^RRemote Thermal

Monitor and Fan Controller

with PECI Interface

The ADT7490 is a dBCool thermal monitor and multiple PWM fan

controller for noise−sensitive or power−sensitive applications

requiring active system cooling. The ADT7490 includes a local

temperature sensor, two remote temperature sensors including series

resistance cancellation, and monitors CPU temperature with a PECI

interface. The ADT7490 can drive a fan using either a low or high

frequency drive signal, and measure and control the speed of up to four

fans so they operate at the lowest possible speed for minimum acoustic

noise.

http://onsemi.com

QSOP−24 NB

CASE 492B

The automatic fan speed control loop optimizes fan speed

for a given temperature using the PECI, remote, or local temperature

information. The effectiveness of the system’s thermal solution can be

monitored using the THERM input. The ADT7490 also provides

critical thermal protection to the system using the bidirectional

THERM/SMBALERT pin as an output to prevent system or

component overheating.

MARKING DIAGRAMS

ADT7490

ARQZ

#DateCode

Assembly Lot

Features

• Temperature Measurement

TOP MARKING

BOTTOM MARKING

♦ 1 Local On−Chip Temperature Sensor

♦ 2 Remote Temperature Sensors

# = Pb−Free Package

♦ 3 Current External Temperature Sensors with Series Resistance

Cancellation (SRC)

♦ PECI Interface for CPU Thermal Information and Support of Up

to 4 PECI Inputs on 1 Pin

PIN ASSIGNMENT

• Fan Drive and Fan Speed Control

SDA

24 PWM1/XTO

♦ 3 High Frequency or Low Frequency PWM Outputs for Use with

3−Wire or 4−Wire Fans

SCL

CCP

GND

+2.5V /THERM

+12V

♦ 4 TACH Inputs to Measure Fan Speed

♦ OS Independent Automatic Fan Speed Control Based on Thermal

Information

GPIO1

GPIO2

PECI

20 +5V

ADT7490

TOP VIEW

MON

18 D1+

♦ Dynamic T

Control Mode to Optimize System Acoustics

MIN

D1–

D2+

♦ Default Startup at 100% PWM for All Fans for Robust Operation

TACH3

15 D2–

TACH4/THERM/SMBALERT/

ADDR SELECT

13 PWM3/ADDREN

• Bidirectional THERM/SMBALERT Pin to Flag Out−of−Limit and

Overtemperature Conditions

PWM2/SMBALERT

TACH1

TACH2

• GPIO Functionality to Support Extra Features

♦ Can be Used for Loadline Setting for Voltage Regulation, LED

Control, or Other Functions

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 74 of this data sheet.

• I

Monitoring for CPU Current and Power Information

• Footprint and Register Compatible with ADT7473/ADT7475/

ADT7476/ADT7476A Family of Fan Controllers

MON

• SMBus Interface with Addressing Capability for Up to 3 Devices

Applications

• Personal Computers

• Servers

Publication Order Number:

December, 2009 − Rev. 4

ADT7490/D

12 3 4 5 6 7...75

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