ADT7467 データシートの表示（PDF） - Analog Devices

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ADT7467

dBCool™ Remote Thermal Monitor and Fan Controller

Analog Devices 

ADT7467

TABLE OF CONTENTS

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

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

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

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

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

Typical Performance Characteristics ............................................. 7

Product Description......................................................................... 9

Comparison between ADT7460 and ADT7467 ....................... 9

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

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

Write Operations ........................................................................ 12

Read Operations ......................................................................... 13

SMBus Timeout .......................................................................... 13

Voltage Measurement Input...................................................... 13

Analog-to-Digital Converter .................................................... 13

Input Circuitry............................................................................ 14

Voltage Measurement Registers................................................ 14

VCCP Limit Registers ................................................................... 14

Additional ADC Functions for Voltage Measurements ........ 14

Temperature Measurement Method ........................................ 15

Series Resistance Cancellation.................................................. 17

Factors Affecting Diode Accuracy ........................................... 17

Additional ADC Functions for Temperature Measurement. 19

Limits, Status Registers, and Interrupts ....................................... 20

Limit Values................................................................................. 20

Status Registers ........................................................................... 21

THERM Timer............................................................................ 23

REVISION HISTORY

Revision 0: Initial Version

Laying Out 2-Wire and 3-Wire Fans ....................................... 28

Operating from 3.3 V Standby.................................................. 32

XNOR Tree Test Mode .............................................................. 33

Power-On Default ...................................................................... 33

Programming the Automatic Fan Speed Control Loop ............ 34

Automatic Fan Control Overview............................................ 34

Step 1: Hardware Configuration.............................................. 35

Recommended Implementation 1 ........................................... 36

Recommended Implementation 2 ........................................... 37

Step 2: Configuring the MUX................................................... 38

Step 3: TMIN Settings for Thermal Calibration Channels....... 40

Step 4: PWMMIN for Each PWM (Fan) Output....................... 41

Step 5: PWMMAX for PWM (Fan) Outputs.............................. 41

Step 6: TRANGE for Temperature Channels................................ 42

Step 7: TTHERM for Temperature Channels ............................... 45

Step 8: THYST for Temperature Channels .................................. 46

Dynamic TMIN Control Mode ................................................... 48

Step 9: Operating Points for Temperature Channels ............. 50

Step 10: High and Low Limits for Temperature Channels ... 51

Step 11: Monitoring THERM ................................................... 53

Enhancing System Acoustics .................................................... 54

Step 12: Ramp Rate for Acoustic Enhancement..................... 56

Register Tables ................................................................................ 59

ADT7467 Programming Block Diagram .................................... 77

Outline Dimensions ....................................................................... 78

Ordering Guide .......................................................................... 78

Rev. 0 | Page 2 of 80

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