ADT7468ARQZ-REEL datasheet(2/81 Pages) ONSEMI

No. de pieza	ADT7468ARQZ-REEL

Descripción Electrónicos	dBCool짰 Remote Thermal Controller and Voltage Monitor

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Fabricante Electrónico	ONSEMI [ON Semiconductor]

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ADT7468

Rev. 3 | Page 2 of 81 | www.onsemi.com

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

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

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

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

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

VID Code Registers.................................................................... 15

Analog-to-Digital Converter ........................................................ 16

Voltage Measurement Input...................................................... 16

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

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

Additional ADC Functions for

Temperature Measurement ....................................................... 21

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

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

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

Interrupts ..................................................................................... 23

Active Cooling ................................................................................ 28

Driving the Fan Using PWM Control ..................................... 28

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

Fan Speed Measurement............................................................ 31

Fan Spin-Up ................................................................................ 33

PWM Logic State........................................................................ 33

Fan Speed Control...................................................................... 34

Miscellaneous Functions ............................................................... 35

Operating from 3.3 V Standby.................................................. 35

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

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

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

Dynamic TMIN Control Mode.................................................... 38

Programming the Automatic Fan Speed Control Loop ............ 40

Step 1: Hardware Configuration .............................................. 40

Step 2: Configuring the Mux .................................................... 43

Step 3: TMIN Settings for Thermal Calibration Channels....... 45

Step 4: PWMMIN for Each PWM (Fan) Output ...................... 46

Step 5: PWMMAX for PWM (Fan) Outputs.............................. 46

Step 6: TRANGE for Temperature Channels................................ 47

Step 7: T

THERM for Temperature Channels ............................... 50

Step 8: THYST for Temperature Channels .................................. 51

Step 9: Operating Points for Temperature Channels ............. 52

Step 10: High and Low Limits for Temperature Channels ... 53

Step 11: Monitoring THERM ................................................... 56

Step 12: Ramp Rate for Acoustic Enhancement ..................... 57

Enhancing System Acoustics......................................................... 59

Acoustic Enhancement Mode Overview ................................ 59

Register Tables................................................................................. 61

ADT7468 Programming Block Diagram .................................... 80

Outline Dimensions ....................................................................... 81

Ordering Guide .......................................................................... 81

REVISION HISTORY

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ADT7468ARQZ-REEL Datasheet(PDF) 2 Page - ON Semiconductor

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