ADT7467ARQZ-R7 datasheet(2/77 Pages) ONSEMI

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ADT7467

Rev. 3 | Page 2 of 77 | www.onsemi.com

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..............................................7

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

Comparison Between ADT7460 and ADT7467.......................9

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

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

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

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

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

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

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

Additional ADC Functions for Voltage Measurements.........15

Temperature Measurement........................................................16

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

Additional ADC Functions for Temperature Measurement.19

Limits, Status Registers, and Interrupts .......................................21

Limit Values .................................................................................21

Status Registers............................................................................22

Interrupts .....................................................................................22

Active Cooling .................................................................................27

Driving the Fan Using PWM Control......................................27

Laying Out 2-Wire and 3-Wire Fans........................................29

Fan Speed Measurement ............................................................30

Fan Spin-Up.................................................................................31

PWM Logic State ........................................................................32

Fan Speed Control ......................................................................33

Miscellaneous Functions................................................................34

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

XNOR Tree Test Mode ...............................................................34

Power-On Default .......................................................................34

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

Dynamic TMIN Control Mode ....................................................36

Programming the Automatic Fan Speed Control Loop.............38

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

Step 2: Configuring the Mux .....................................................40

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

Step 4: PWMMIN for PWM (Fan) Outputs ...............................43

Step 5: PWMMAX for PWM (Fan) Outputs ..............................44

Step 6: TRANGE for Temperature Channels ................................45

Step 7: T

THERM for Temperature Channels ................................ 47

Step 8: THYST for Temperature Channels ..................................49

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

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

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

Step 12: Ramp Rate for Acoustic Enhancement .....................54

Enhancing System Acoustics .........................................................57

Acoustic Enhancement Mode Overview .................................57

ADT7467 Programming Block Diagram.....................................76

Outline Dimensions........................................................................77

Ordering Guide ...........................................................................77

REVISION HISTORY

01/08 - Rev 3: Conversion to ON Semiconductor

12/07—Rev. A to Rev. B

Changes to Limit Values Section

Changes to Table 13

Changes to Figure 34 and Figure 36

Changes to Figure 41

Changes to Step 11: Monitoring THERM Section

Changes to Table 26

Changes to Table 30

Changes to Table 37

Changes to Table 38

Changes to Table 41 and Table 42

Changes to Table 52 and Table 53

Changes to Table 54

Changes to Figure 84

Updated Outline Dimensions

Changes to Ordering Guide

7/05—Rev. 0 to Rev. A

Change to Absolute Maximum Ratings

Change to Recommended Implementation Section

Changes to Recommended Implementation Figure

Deleted Recommended Implementation 2 Section

Deleted Recommended Implementation 2 Figure

Change to Table 17

Changes to Ordering Guide

4/04—Revision 0: Initial Version

ADT7467ARQZ-R7 Datasheet(PDF) 2 Page - ON Semiconductor

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