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ADT7473

dBCOOL® Remote Thermal Monitor and Fan Control

ON Semiconductor 

ADT7473

dBCOOLR Remote Thermal

Monitor and Fan Control

The ADT7473/ADT7473−1 dBCOOL controller is a thermal

monitor and multiple PWM fan controller for noise sensitive or power

sensitive applications requiring active system cooling. The

ADT7473/ADT7473−1 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 they operate at the lowest

possible speed for minimum acoustic noise.

The automatic fan speed control loop optimizes fan speed for a

given temperature. A unique dynamic TMIN control mode enables the

system thermals/acoustics to be intelligently managed. The

effectiveness of the system’s thermal solution can be monitored using

the THERM input. The ADT7473/ADT7473−1 also provide 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

• Series Resistance Cancellation on the Remote Channel

• Extended Temperature Measurement Range, Up to 191°C

• Dynamic TMIN Control Mode Intelligently Optimizes System

Acoustics

• 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)

• This is a Pb−Free Device

• Fully RoHS Compliant

http://onsemi.com

QSOP−16

CASE 492

MARKING DIAGRAMS

ADT747

3ARQZ

#YYWW

xxxx

ADT

7473−1

ARQZ

xxxx

ADT7473

ADT7473−1

#

= Pb−Free Package

YYWW = Date Code

xx

= Assembly Lot

PIN ASSIGNMENTS

SCL 1

GND 2

VCC 3

TACH3 4

PWM2/ 5

SMBALERT

TACH1 6

TACH2 7

PWM3 8

16 SDA

15 PWM1/XTO

ADT7473

TOP VIEW

14 VCCP

13 D1+

12 D1–

11 D2+

10 D2–

9

TACH4/GPIO/THERM

SMBALERT

SCL 1

16 SDA

GND 2

15 PWM1/XTO

VCC 3

14 VCCP

TACH3/

ADDR SELECT

4

ADT7473−1 13

D1+

THERM_LATCH/ 5 TOP VIEW 12 D1–

PWM2

TACH1 6

11 D2+

TACH2 7

PWM3/ADDREN 8

10 D2–

9

TACH4/GPIO/THERM

SMBALERT

© Semiconductor Components Industries, LLC, 2009

April, 2009 − Rev. 6

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 73 of this data sheet.

1

Publication Order Number:

ADT7473/D

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