ADT7420

Data Sheet

Rev. 0 | Page 2 of 24

TABLE OF CONTENTS

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

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

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

Product Highlights ........................................................................... 1

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

Revision History ............................................................................... 2

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

I2C Timing Specifications............................................................ 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

Theory of Operation ...................................................................... 10

Circuit Information.................................................................... 10

Converter Details........................................................................ 10

Normal Mode.............................................................................. 10

One-Shot Mode .......................................................................... 10

1 SPS Mode.................................................................................. 11

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............................................................................................. 20

General Call ................................................................................ 20

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

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

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

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

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

Powering from a Switching Regulator..................................... 23

Temperature Measurement....................................................... 23

Quick Guide to Measuring Temperature ................................ 23

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

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

REVISION HISTORY

12/12—Revision 0: Initial Version