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ADT7476ARQH

dBCOOL® Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

ADT7476

dBCOOLR Remote Thermal

Controller and Voltage

Monitor

The ADT7476 dBCOOL controller is a thermal monitor

and multiple PWM fan controller for noise−sensitive or

power−sensitive applications requiring active system cooling. The

ADT7476 can drive a fan using either a low or high frequency drive

signal and can monitor the temperature of up to two remote sensor

diodes plus its own internal temperature. The part also measures and

controls the speed of up to four fans, so the fans 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 ADT7476

also provides critical thermal protection to the system using the

bidirectional THERM pin as an output to prevent system or

component overheating.

Features

• Monitors Up to Five Voltages

• Controls and Monitors Up to Four Fans

• High and Low Frequency Fan Drive Signal

• One On−Chip and Two 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® Pentium® 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

• Pb−Free Package is Available

• Halide−Free Packages are Available

http://onsemi.com

QSOP−24 NB

CASE 492B

MARKING DIAGRAMS

ADT7476RQZ

#YYWW

xxxx

XX = Specific Device Code

#

= Pb−Free Package

YYWW = Date Code

xxxx = Assembly Lot Code

PIN ASSIGNMENT

SDA 1

SCL 2

GND 3

VCC 4

VID0/GPIO0 5

VID1/GPIO1 6

VID2/GPIO2 7

VID3/GPIO3 8

TACH3 9

PWM2/

SMBALERT

10

TACH1 11

TACH2 12

ADT7476

24 PWM1/XTO

23 VCCP

22 +2.5VIN/THERM

21 +12VIN/VID5

20 +5VIN

19 VID4/GPIO4

18 D1+

17 D1−

16 D2+

15 D2−

14

TACH4/THERM/SMBALERT/

GPIO6/ADDR SELECT

13 PWM3/ADDREN

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 66 of this data sheet.

© Semiconductor Components Industries, LLC, 2010

1

May, 2010 − Rev. 6

Publication Order Number:

ADT7476/D

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