ADT7462ACPZ-REEL7 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADT7462ACPZ-REEL7 Datasheet PDF : 92 Pages
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ADT7462
TABLE OF CONTENTS
Features ...................................................................................... 1
Fan Drive Using PWM Control........................................33
Applications............................................................................... 1
Fan Speed Measurement and Control..................................35
General Description ................................................................. 1
TACH Inputs .......................................................................35
Functional Block Diagram ...................................................... 1
Fan Speed Measurement....................................................35
Revision History ....................................................................... 3
PWM Logic State ................................................................37
Specifications............................................................................. 4
Fan Speed Control ..............................................................37
Timing Diagram ................................................................... 5
Programming the Automatic Fan Speed Control Loop 39
Absolute Maximum Ratings.................................................... 6
Step 1—Configuring the MUX.........................................40
Thermal Resistance .............................................................. 6
Step 2—TMIN Settings for Thermal Calibration Channels . 40
ESD Caution.......................................................................... 6
Step 3—PWMMIN for Each PWM (Fan) Output.............42
Pin Configuration and Function Descriptions..................... 7
Step 4—PWMMAX for PWM (Fan) Outputs ....................42
Functional Description: Easy Configuration Options ..10
Step 5—TRANGE for Temperature Channels ......................43
Typical Performance Characteristics ...................................15
Step 6—T for Temperature Channels......................46
THERM
Serial Bus Interface.................................................................18
Step 7—THYST for Temperature Channels ........................47
ADD Input...........................................................................18
Dynamic TMIN Control Programming .............................49
SMBus Fixed Address ........................................................18
Step 8—Operating Points for Temperature Channels ...49
SMBus Operation ...............................................................18
Step 9—High and Low Limits for Temperature Channels 49
Write Operations ................................................................20
Step 10—Monitoring THERM..........................................52
Read Operations .................................................................21
Enhancing System Acoustics.............................................52
Alert Response Address.....................................................22
Step 11—Ramp Rate for Acoustic Enhancement ...........54
SMBus Timeout ..................................................................22
Fan Freewheeling Test Mode.............................................56
Temperature and Voltage Measurement..............................23
THERM I/O Operation .........................................................57
Temperature Measurement ...............................................23
General-Purpose I/O Pins .....................................................59
Series Resistance Cancellation..........................................24
EDO Circuitry.....................................................................59
Voltage Measurement ........................................................26
Other Digital Inputs ...........................................................60
Battery Measurement Input (VBATT).................................28
Reset I/O ..............................................................................60
ADC Information...............................................................29
Chassis Intrusion Input......................................................60
Dynamic VID Monitoring ....................................................30
Power-Up Sequence................................................................61
VID Code ............................................................................30
XOR Tree Test..........................................................................62
Dynamic VID Monitoring ................................................30
Register Map............................................................................63
Status and Mask Registers and ALERT................................32
Outline Dimensions ...............................................................90
Fan Control..............................................................................33
Ordering Guide...................................................................90
Rev. 0 | Page 2 of 92
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