ADT7475_1110 ONSEMI [ON Semiconductor], ADT7475_1110 Datasheet

ADT7475_1110

Manufacturer Part Number

ADT7475_1110

Description

dbCOOL Remote Thermal Monitor and Fan Controller

Manufacturer

ONSEMI [ON Semiconductor]

Datasheet

1.ADT7475_1110.pdf (58 pages)

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ADT7475

dbCOOLt Remote Thermal

Monitor and Fan Controller

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.

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

•

October, 2011 − Rev. 5

The ADT7475 dbCOOL controller is a thermal monitor and

The automatic fan speed control loop optimizes fan speed for a

on Measured Temperature

Changing Fan Speeds

(Fully SMBus 1.1 Compliant)

Compliant

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

Enhanced Acoustic Mode Dramatically Reduces User Perception of

Thermal Protection Feature via THERM Output

Monitors Performance Impact of Intel Pentium

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

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

4 Processor

See detailed ordering and shipping information in the package

dimensions section on page 57 of this data sheet.

SMBALERT

ORDERING INFORMATION

TACH3

PWM2/

TACH1

TACH2

PWM3

YYWW = Date Code

GND

SCL

CASE 492

QSOP−16

PIN ASSIGNMENT

http://onsemi.com

= Pb−Free Package

ADT7475

TOP VIEW

Publication Order Number:

MARKING

DIAGRAM

SDA

PWM1/XTO

D1+

D1–

D2+

D2–

TACH4/GPIO/THERM

ADT7475

SMBALERT

#YYWW

CCP

ARQZ

ADT7475/D

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