ADT7468ARQ 데이터 시트보기 (PDF) - Analog Devices

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ADT7468ARQ

dBCool™ Remote Thermal Controller and Voltage Monitor

Analog Devices 

ADT7468

TABLE OF CONTENTS

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

Comparison between ADT7463 and ADT7468 ..................... 10

How to Set the Functionality of Pin 14 ................................... 11

Recommended Implementation............................................... 11

Serial Bus Interface..................................................................... 12

Write Operations ........................................................................ 13

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

SMBus Timeout .......................................................................... 14

Voltage Measurement Input...................................................... 14

Analog-to-Digital Converter .................................................... 14

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

Voltage Measurement Registers................................................ 15

Voltage Limit Registers .............................................................. 15

VID Code Monitoring ............................................................... 15

VID Code Input Threshold Voltage......................................... 15

VID Code Change Detect Function ........................................ 16

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

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

Series Resistance Cancellation.................................................. 19

Factors Affecting Diode Accuracy ........................................... 19

Additional ADC Functions for Temperature Measurement. 21

Limits, Status Registers, and Interrupts ....................................... 22

Limit Values................................................................................. 22

REVISION HISTORY

Revision 0: Initial Version

Status Registers ........................................................................... 23

THERM Timer ........................................................................... 25

Fan Drive Using PWM Control ............................................... 28

Laying Out 2-Wire and 3-Wire Fans ....................................... 30

Operating from 3.3 V Standby.................................................. 34

XNOR Tree Test Mode .............................................................. 35

Power-On Default ...................................................................... 35

Programming the Automatic Fan Speed Control Loop ............ 36

Automatic Fan Control Overview............................................ 36

Step 1: Hardware Configuration.............................................. 37

Recommended Implementation 1 ........................................... 38

Recommended Implementation 2 ........................................... 39

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 7: TTHERM for Temperature Channels ............................... 47

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

Dynamic TMIN Control Mode ................................................... 49

Step 9: Operating Points for Temperature Channels ............. 51

Step 10: High and Low Limits for Temperature Channels ... 52

Step 11: Monitoring THERM ................................................... 55

Enhancing System Acoustics .................................................... 56

Step 12: Ramp Rate for Acoustic Enhancement..................... 58

Register Tables ................................................................................ 60

ADT7468 Programming Block Diagram .................................... 79

Outline Dimensions ....................................................................... 80

Ordering Guide .......................................................................... 80

Rev. 0 | Page 2 of 80

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