ADT7476A datasheet(1/67 Pages) ONSEMI

Part #	ADT7476A

Description	dBCOOL Remote Thermal Controller and Voltage Monitor

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Manufacturer	ONSEMI [ON Semiconductor]

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May, 2010 − Rev. 3

1

Publication Order Number:

ADT7476A/D

ADT7476A

dBCOOLR Remote Thermal

Controller and Voltage

Monitor

The ADT7476A dBCOOL controller is a thermal monitor

and multiple PWM fan controller for noise-sensitive or

power-sensitive applications requiring active system cooling. The

ADT7476A 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 ADT7476A

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

• Improved TACH and PWM Performance

• 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

• 5.0 V Support on all TACH and PWM Channels

• Meets SMBus 2.0 Electrical Specifications

• These are Pb−Free Devices

http://onsemi.com

PIN ASSIGNMENT

QSOP−24 NB

CASE 492B

See detailed ordering and shipping information in the package

dimensions section on page 66 of this data sheet.

ORDERING INFORMATION

MARKING DIAGRAMS

+2.5VIN/THERM

PWM2/

SMBALERT

PWM3/ADDREN

1

2

3

4

5

6

7

8

20

21

22

23

24

19

18

17

14

13

12

11

SCL

GND

VCC

VID2/GPIO2

VID1/GPIO1

VID0/GPIO0

SDA

VCCP

+12VIN/VID5

D1+

VID4/GPIO4

+5VIN

VID3/GPIO3

TACH3

TACH2

TACH1

D1-

D2+

D2-

PWM1/XTO

ADT7476A

TACH4/THERM/SMBALERT/

GPIO6/ADDR SELECT

9

10

16

15

XX

= Specific Device Code

#

= Pb−Free Package

YYWW = Date Code

xxxx

= Assembly Lot Code

ADT7476AARQZ

#YYWW

xxxx

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