ADT7470 データシートの表示（PDF） - Analog Devices

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ADT7470

Temperature Sensor Hub and Fan Controller

Analog Devices 

ADT7470

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

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

Serial Bus Timing Specifications ................................................ 4

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

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

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

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

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

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

Configuration Register 1 (Address 0x40).................................. 7

Configuration Register 2 (Address 0x74).................................. 7

ID Registers ................................................................................... 7

General-Purpose I/O Pins (Open Drain)...................................... 8

SMBus/I2C Serial Interface.............................................................. 9

Address Selection ......................................................................... 9

Serial Bus Protocol ....................................................................... 9

Write Operations ........................................................................ 11

Read Operations ......................................................................... 12

SMBus Timeout .......................................................................... 12

Temperature Measurement Using TMP05/TMP06 ................... 13

Measuring Temperature ............................................................ 13

Temperature ReadBack By the Host ........................................ 14

REVISION HISTORY

4/13—Rev. D to Rev. E

Changed Input Low Voltage, VIL from 0.4 V to 1.0 V and Added

Test Conditions/Comments; Table 1.............................................. 3

3/13—Rev. C to Rev. D

Changes to Calculating Fan Speed and Tachometer Limits

Section.............................................................................................. 24

Changes to Bit 3, Table 43.............................................................. 35

Updated Outline Dimensions ....................................................... 39

7/09—Rev. B to Rev. C

Changes to Functional Description Section ................................. 7

Added Temperature Data Format Section .................................. 14

Additions to Fan Drive Using PWM Control Section............... 20

Data Sheet

Temperature Data Format......................................................... 14

Temperature Measurement Limits........................................... 15

Thermal Zones for Automatic Fan Control............................ 15

Limit and Status Registers ............................................................. 16

Limit Values ................................................................................ 16

Temperature Limits .................................................................... 16

Fan Speed Limits ........................................................................ 16

Out-of-Limit Comparisons....................................................... 16

Status Registers ........................................................................... 17

SMBALERT Interrupt................................................................ 18

Fan Drive Using PWM Control.................................................... 20

High Frequency Fan Drive........................................................ 20

Low Frequency Fan Drive ......................................................... 20

Setting the Fan Drive Frequency.............................................. 21

Inverted PWM Output .............................................................. 21

Fan Full Speed Function............................................................ 21

Fan Speed Measurement................................................................ 22

Tach Inputs .................................................................................. 22

Fan Speed Measurement ........................................................... 23

Manual Fan Speed Control ........................................................... 25

Setting the PWM Duty Cycle ................................................... 25

Automatic Fan Speed Control ...................................................... 26

Register Map ................................................................................... 27

Detailed Register Descriptions ..................................................... 29

Outline Dimensions ....................................................................... 39

Ordering Guide .......................................................................... 39

Additions to Manual Fan Speed Control Section ...................... 25

Additions to Automatic Fan Speed Control Section ................. 26

7/05—Rev. A to Rev. B

References to PWM_IN changed to TMP_IN ...............Universal

Changes to TMIN Registers Section ..................................................7

Added Address Selection Section....................................................7

Added Thermal Zones Section..................................................... 12

Added Temperature Reading Section .......................................... 13

Added Note to Table 39 ................................................................. 32

2/05—Rev. 0 to Rev. A

Added General-Purpose I/O Pins (Open Drain) Section......... 11

11/04—Revision 0: Initial Version

Rev. E | Page 2 of 40

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