ADT7460 datasheet(1/46 Pages) ONSEMI

Part #	ADT7460

Description	dBCOOL Remote Thermal Monitor and Fan Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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June, 2010 − Rev. 5

1

Publication Order Number:

ADT7460/D

ADT7460

dBCOOLR Remote Thermal

Monitor and Fan Controller

The ADT7460 dBCOOL controller is a thermal monitor and

multiple PWM fan controller for noise−sensitive applications

requiring active system cooling. It can monitor the temperature of up

to two remote sensor diodes plus its own internal temperature. It can

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. 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 ADT7460 also provides critical thermal protection to the

system by using the bidirectional THERM pin as an output to prevent

system or component overheating.

Features

• Controls and Monitors Up to 4 Fans

• 1 On−Chip and 2 Remote Temperature Sensors

• Dynamic TMINControl Mode Optimizes System Acoustics

Intelligently

• 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

• Processor Thermal Control Circuit via THERM Input

• 2−Wire and 3−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

APPLICATIONS

• Low Acoustic Noise PCs

• Networking and Telecommunications Equipment

http://onsemi.com

See detailed ordering and shipping information in the package

dimensions section on page 45 of this data sheet.

ORDERING INFORMATION

MARKING

DIAGRAM

PIN ASSIGNMENT

xxx

= Device Code

#

= Pb−Free Package

YYWW = Date Code

12

11

10

9

D1–

D2+

D2–

16

15

SDA

PWM1/XTO

VCCP

D1+

5

TACH1

TACH2

PWM3/

1

2

3

4

SCL

GND

VCC

TACH3

ADT7460

TOP VIEW

PWM2/

SMBALERT

TACH4/ADDR SELECT

/THERM

T7460A

RQZ

#YYWW

QSOP−16

CASE 492

8

6

7

ADDR ENABLE

14

13

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