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ADT7481

Dual Channel Temperature Sensor and Over Temperature Alarm

Analog Devices 

ADT7481

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

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

Timing Specifications .................................................................. 4

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

Thermal Characteristics .............................................................. 5

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

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

Typical Performance Characteristics ............................................. 7

Theory of Operation ........................................................................ 9

Temperature Measurement Method .......................................... 9

Temperature Measurement Results.......................................... 10

Temperature Measurement Range ........................................... 10

Temperature Data Format ......................................................... 10

Registers ........................................................................................... 12

Address Pointer Register ........................................................... 12

Temperature Value Registers..................................................... 12

Conversion Rate/Channel Selector Register........................... 13

Limit Registers ............................................................................ 13

REVISION HISTORY

7/05—Revision 0: Initial Version

Status Registers ........................................................................... 14

Offset Register ............................................................................ 14

One-Shot Register ...................................................................... 15

Consecutive ALERT Register ................................................... 15

Serial Bus Interface......................................................................... 17

Addressing the Device ............................................................... 17

ALERT Output............................................................................ 19

Masking the ALERT Output..................................................... 19

Low Power Standby Mode......................................................... 19

Sensor Fault Detection .............................................................. 19

Interrupt System ......................................................................... 20

Applications Information .............................................................. 22

Noise Filtering............................................................................. 22

Factors Affecting Diode Accuracy........................................... 22

Thermal Inertia and Self-Heating............................................ 22

Layout Considerations............................................................... 22

Application Circuit..................................................................... 23

Outline Dimensions ....................................................................... 24

Ordering Guide .......................................................................... 24

Rev. 0 | Page 2 of 24

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