ADT7475ARQZ(2011) 查看數據表（PDF） - ON Semiconductor

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ADT7475ARQZ
(Rev.:2011)

dbCOOL™ Remote Thermal Monitor and Fan Controller

ON Semiconductor 

ADT7475

dbCOOLt Remote Thermal

Monitor and Fan Controller

The ADT7475 dbCOOL controller is a thermal monitor and

multiple PWM fan controller for noise−sensitive or power−sensitive

applications requiring active system cooling. The ADT7475 can drive

a fan using either a low or high frequency drive signal, monitor the

temperature of up to two remote sensor diodes plus its own internal

temperature, and measure and control the speed of up to four fans so

that they operate at the lowest possible speed for minimum acoustic

noise.

The automatic fan speed control loop optimizes fan speed for a

given temperature. The effectiveness of the system’s thermal solution

can be monitored using the THERM input. The ADT7475 also

provides critical thermal protection to the system using the

bidirectional THERM pin as an output to prevent system or

component overheating.

Features

• Controls and Monitors Up to 4 Fans

• High and Low Frequency Fan Drive Signal

• 1 On−Chip and 2 Remote Temperature Sensors

• Extended Temperature Measurement Range, Up to 191°C

• Automatic Fan Speed Control Mode Controls System Cooling Based

on Measured Temperature

• Enhanced Acoustic Mode Dramatically Reduces User Perception of

Changing Fan Speeds

• Thermal Protection Feature via THERM Output

• Monitors Performance Impact of Intel PentiumR 4 Processor

• Thermal Control Circuit via THERM Input

• 3−Wire and 4−Wire Fan Speed Measurement

• Limit Comparison of All Monitored Values

• Meets SMBus 2.0 Electrical Specifications

(Fully SMBus 1.1 Compliant)

• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS

Compliant

http://onsemi.com

MARKING

DIAGRAM

QSOP−16

CASE 492

ADT7475

ARQZ

#YYWW

#

= Pb−Free Package

YYWW = Date Code

PIN ASSIGNMENT

SCL 1

GND 2

VCC 3

TACH3 4

PWM2/ 5

SMBALERT

TACH1 6

TACH2 7

PWM3 8

16 SDA

15 PWM1/XTO

ADT7475

TOP VIEW

14 VCCP

13 D1+

12 D1–

11 D2+

10 D2–

9

TACH4/GPIO/THERM

SMBALERT

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 57 of this data sheet.

© Semiconductor Components Industries, LLC, 2011

1

October, 2011 − Rev. 5

Publication Order Number:

ADT7475/D

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