ADT7470ARQ-REEL7 datasheet(2/40 Pages) AD

Part #	ADT7470ARQ-REEL7

Description	Temperature Sensor Hub and Fan Controller

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ADT7470

Preliminary Technical Data

Rev. PrA | Page 2 of 40

TABLE OF CONTENTS

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 5

Thermal Characteristics .............................................................. 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Functional Description .................................................................... 7

General Description..................................................................... 7

Fan Speed Measurement.............................................................. 7

ADT7470 Address Selection ....................................................... 7

Internal Registers of the ADT7470 ............................................ 7

SMBus/I2C Communications Interface ..................................... 7

ADT7470 Write Operations ...................................................... 10

ADT7470 Read Operations....................................................... 11

SMBus Timeout .......................................................................... 11

Temperature Measurement Using TMP05/TMP06 ................... 12

Measuring Temperature ............................................................ 12

TMP05/TMP06 Decoder........................................................... 12

Interrupt Functionality and Status Registers .............................. 13

Limit Values................................................................................. 13

8-Bit Limits.................................................................................. 13

16-Bit Limits ............................................................................... 13

Out-of-Limit Comparisons....................................................... 14

Monitoring Cycle Time ............................................................. 15

Status Registers ........................................................................... 15

SMBALERT Interrupt Behavior ............................................... 16

Handling SMBALERT Interrupts............................................. 16

Masking Interrupt Sources........................................................ 17

Enabling the SMBALERT Interrupt Output........................... 17

Fan Drive Using PWM Control.................................................... 18

Fan Speed Measurement................................................................ 19

Tach Inputs.................................................................................. 19

Fan Speed Measurement ........................................................... 19

Manual Fan Speed Control ........................................................... 22

PWM Logic State........................................................................ 22

Manual Fan Speed Control ....................................................... 22

Automatic Fan Speed Control .................................................. 22

ADT7470 Registers ........................................................................ 23

Outline Dimensions ....................................................................... 38

Ordering Guide .......................................................................... 38

REVISION HISTORY

Revision 0: Initial Version

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ADT7470ARQ-REEL7 Datasheet(PDF) 2 Page - Analog Devices

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