ADT7476AARQZ-REEL datasheet(2/72 Pages) AD

Part #	ADT7476AARQZ-REEL

Description	dBCool Remote Thermal Controller and Voltage Monitor

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Manufacturer	AD [Analog Devices]

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ADT7476A

Rev. 0 | Page 2 of 72

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

Typical Performance Characteristics ............................................. 8

Product Description ....................................................................... 10

Feature Comparisons Between ADT7476A and ADT7468.. 10

Recommended Implementation............................................... 10

Serial Bus Interface..................................................................... 11

Write Operations ........................................................................ 14

Read Operations ......................................................................... 14

SMBus Timeout .......................................................................... 15

Virus Protection.......................................................................... 15

Voltage Measurement Input...................................................... 15

Analog-to-Digital Converter .................................................... 15

Input Circuitry............................................................................ 15

Voltage Measurement Registers................................................ 16

Voltage Limit Registers .............................................................. 16

Extended Resolution Registers ................................................. 16

Additional ADC Functions for Voltage Measurements ........ 16

VID Code Monitoring ............................................................... 18

VID Code Input Threshold Voltage......................................... 18

VID Code Change Detect Function ........................................ 18

Programming the GPIOs........................................................... 18

Temperature Measurement Method ........................................ 18

Factors Affecting Diode Accuracy ........................................... 20

Additional ADC Functions for Temperature Measurement 21

Limits, Status Registers, and Interrupts....................................... 23

Limit Values ................................................................................ 23

Status Registers ........................................................................... 24

THERM Timer ........................................................................... 26

Fan Drive Using PWM Control ............................................... 29

Laying Out 3-Wire Fans ............................................................ 31

Programming TRANGE.................................................................. 34

Programming the Automatic Fan Speed Control Loop ............ 35

Manual Fan Control Overview................................................. 35

THERM Operation in Manual Mode...................................... 35

Automatic Fan Control Overview............................................ 35

Step 1—Hardware Configuration ............................................ 37

Step 2—Configuring the Mux .................................................. 40

Step 3—TMIN Settings for Thermal Calibration Channels .... 42

Step 4—PWMMIN for Each PWM (Fan) Output .................... 43

Step 5—PWMMAX for PWM (Fan) Outputs............................ 43

Step 6—TRANGE for Temperature Channels.............................. 44

Step 7—T

THERM for Temperature Channels ............................. 46

Step 8—THYST for Temperature Channels................................ 48

Fan Presence Detect................................................................... 49

Fan Sync....................................................................................... 50

Standby Mode ............................................................................. 50

XNOR Tree Test Mode .............................................................. 50

Power-On Default ...................................................................... 50

Register Tables ................................................................................ 51

Outline Dimensions ....................................................................... 71

Ordering Guide .......................................................................... 71

REVISION HISTORY

1/06—Revision 0: Initial Version

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