ADT7420

Preliminary Technical Data

Rev. PrA | Page 2 of 2

TABLE OF CONTENTS

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

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

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

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

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

I2C Timing Specifications............................................................ 4

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

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

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

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

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

Circuit Information...................................................................... 9

Converter Details.......................................................................... 9

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

One-Shot Mode ............................................................................ 9

1 SPS Mode.................................................................................... 9

Shutdown..................................................................................... 11

Fault Queue ................................................................................. 11

Temperature Data Format......................................................... 12

Temperature Conversion Formulas ......................................... 12

Registers........................................................................................... 13

Address Pointer Register ........................................................... 13

Temperature Value Registers .................................................... 13

Status Register............................................................................. 14

Configuration Register .............................................................. 14

THIGH Setpoint Registers............................................................. 15

TLOW Setpoint Registers.............................................................. 15

TCRIT Setpoint Registers.............................................................. 15

THYST Setpoint Register............................................................... 16

ID Register................................................................................... 16

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

Serial Bus Address...................................................................... 17

Writing Data ............................................................................... 18

Reading Data............................................................................... 19

Reset............................................................................................. 19

General Call ................................................................................ 19

INT and CT Outputs...................................................................... 21

Undertemperature and Overtemperature Detection ............ 21

Applications Information .............................................................. 23

Thermal Response Time ........................................................... 23

Supply Decoupling ..................................................................... 23

Temperature Monitoring........................................................... 23

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

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