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ADT7462 データシート(PDF) 2 Page - Analog Devices

部品番号 ADT7462
部品情報  Flexible Temperature and Voltage Monitor and System Fan Controller
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADT7462 データシート(HTML) 2 Page - Analog Devices

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


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