ADT7476A データシートの表示（PDF） - ON Semiconductor

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ADT7476A

Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

ADT7476A

Remote Thermal Controller

and Voltage Monitor

The ADT7476A 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

• This Device is Pb-Free, Halogen Free and is RoHS Compliant

www.onsemi.com

QSOP−24 NB

CASE 492B

PIN ASSIGNMENT

SDA 1

24 PWM1/XTO

SCL 2

GND 3

VCC 4

VID0/GPIO0 5

VID1/GPIO1 6

VID2/GPIO2 7

VID3/GPIO3 8

ADT7476A

(Top View)

23 VCCP

22 +2.5VIN/THERM

21 +12VIN/VID5

20 +5VIN

19 VID4/GPIO4

18 D1+

17 D1−

TACH3 9

PWM2/

10

SMBALERT

TACH1 11

16 D2+

15 D2−

14 *

TACH2 12

13 PWM3/ADDREN

*TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT

MARKING DIAGRAMS

ADT7476AARQZ

#YYWW

xxxx

ADT7476AARQZ = Specific Device Code

#

= Pb-Free Package

YYWW

= Date Code

xxxx

= Assembly Lot Code

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 68 of this data sheet.

© Semiconductor Components Industries, LLC, 2016

1

February, 2016 − Rev. 7

Publication Order Number:

ADT7476A/D

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