ADT7466 データシートの表示（PDF） - ON Semiconductor
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ADT7466 Datasheet PDF : 48 Pages
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ADT7466
TABLE OF CONTENTS
Specifications..................................................................................... 3
Serial Bus Timing ......................................................................... 5
Absolute Maximum Ratings............................................................ 6
Thermal Characteristics .............................................................. 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Functional Description .................................................................. 11
Measurement Inputs .................................................................. 11
Sequential Measurement ........................................................... 11
Fan Speed Measurement and Control ..................................... 11
Internal Registers of the ADT7466........................................... 11
Theory of Operation ...................................................................... 12
Serial Bus Interface..................................................................... 12
Write and Read Operations....................................................... 14
Alert Response Address (ARA) ................................................ 15
SMBus Timeout .......................................................................... 15
Voltage Measurement ................................................................ 15
Reference Voltage Output.......................................................... 16
Configuration of Pin 11 and Pin 12 ......................................... 16
Temperature Measurement ....................................................... 17
Series Resistance Cancellation.................................................. 17
Temperature Measurement Method ........................................ 17
Using Discrete Transistors......................................................... 17
Temperature Measurement Using Thermistors ..................... 19
Reading Temperature from the ADT7466 .............................. 21
Additional ADC Functions ....................................................... 22
Limit Values ................................................................................ 22
Alert Interrupt Behavior............................................................ 23
Configuring the ADT7466 THERM Pin as an Output ......... 26
Fan Drive ..................................................................................... 27
PWM or Switch Mode Fan Drive............................................. 27
Fan Speed Measurement ........................................................... 27
Fan Start-Up Timeout................................................................ 29
Automatic Fan Speed Control .................................................. 30
Starting the Fan .......................................................................... 31
XOR Test Mode............................................................................... 32
Application Circuit......................................................................... 33
ADT7466 Register Map ................................................................. 34
Register Details ........................................................................... 36
Outline Dimensions ....................................................................... 48
Ordering Guide .......................................................................... 48
Rev. 3 | Page 2 of 48 | www.onsemi.com
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