ADT7476ARQZ-REEL データシートの表示（PDF） - Analog Devices

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ADT7476ARQZ-REEL

dBCool™ Remote Thermal Controller and Voltage Monitor

Analog Devices 

ADT7476

TABLE OF CONTENTS

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

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

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

Table of Contents .............................................................................. 2

Revision History ............................................................................... 3

Specifications..................................................................................... 4

Timing Diagram ........................................................................... 5

Absolute Maximum Ratings............................................................ 6

Thermal Resistance ...................................................................... 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 9

Product Description....................................................................... 11

Feature Comparisons Between ADT7476 and ADT7468..... 11

Recommended Implementation............................................... 12

Serial Bus Interface..................................................................... 13

Write Operations ........................................................................ 15

Read Operations ......................................................................... 16

SMBus Timeout .......................................................................... 16

Virus Protection.......................................................................... 16

Voltage Measurement Input...................................................... 17

Analog-to-Digital Converter .................................................... 17

Input Circuitry............................................................................ 17

Voltage Measurement Registers................................................ 17

Voltage Limit Registers .............................................................. 17

Extended Resolution Registers ................................................. 17

Additional ADC Functions for Voltage Measurements ........ 17

VID Code Monitoring ............................................................... 20

VID Code Input Threshold Voltage......................................... 20

VID Code Change Detect Function ........................................ 20

Programming the GPIOs........................................................... 20

Temperature Measurement Method ........................................ 20

Factors Affecting Diode Accuracy........................................... 22

Additional ADC Functions for Temperature

Measurement .............................................................................. 23

Limits, Status Registers, and Interrupts....................................... 25

Limit Values ................................................................................ 25

Status Registers ........................................................................... 26

THERM Timer ........................................................................... 28

Fan Drive Using PWM Control ............................................... 31

Laying Out 3-Wire Fans ............................................................ 33

Programming TRANGE.................................................................. 36

Programming the Automatic Fan Speed Control Loop ............ 37

Manual Fan Control Overview................................................. 37

THERM Operation in Manual Mode...................................... 37

Automatic Fan Control Overview............................................ 37

Step 1: Hardware Configuration .............................................. 38

Step 2: Configuring the Mux .................................................... 41

Step 3: TMIN Settings for Thermal Calibration Channels ...... 43

Step 4: PWMMIN for Each PWM (Fan) Output ...................... 44

Step 5: PWMMAX for PWM (Fan) Outputs.............................. 45

Step 6: TRANGE for Temperature Channels................................ 46

Step 7: TTHERM for Temperature Channels ............................... 48

Step 8: THYST for Temperature Channels.................................. 50

Fan Presence Detect................................................................... 51

Fan Sync....................................................................................... 52

Standby Mode ............................................................................. 52

XNOR Tree Test Mode .............................................................. 52

Power-On Default ...................................................................... 52

Register Tables ................................................................................ 53

Outline Dimensions ....................................................................... 72

Ordering Guide .......................................................................... 72

Rev. A | Page 2 of 72

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