ADT7312

Data Sheet

Rev. A | 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

 

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

 

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

 

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

 

Pad Configuration and Function Descriptions ............................ 6

 

Die Bond Pad Coordinates.............................................................. 7

 

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

 

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

 

Circuit Description....................................................................... 9

 

Converter Architecture................................................................ 9

 

Normal Mode (Continuous Conversion Mode) ...................... 9

 

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

 

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

 

Shutdown Mode.......................................................................... 11

 

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

 

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

 

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

 

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

 

Status Register ............................................................................. 13

 

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

 

Temperature Value Register ...................................................... 15

 

ID Register................................................................................... 15

 

TCRIT Setpoint Register ............................................................... 15

 

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

 

THIGH Setpoint Register .............................................................. 16

 

TLOW Setpoint Register ............................................................... 16

 

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

 

SPI Command Byte.................................................................... 17

 

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

 

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

 

Interfacing to DSPs or Microcontrollers ................................. 19

 

Resetting the Serial Interface .................................................... 19

 

INT and CT Outputs...................................................................... 20

 

Undertemperature and Overtemperature Detection ............ 20

 

Redundant Critical Generator .................................................. 21

 

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

 

Thermal Response Time ........................................................... 22

 

Supply Decoupling ..................................................................... 22

 

Powering from a Switching Regulator..................................... 22

 

Temperature Monitoring........................................................... 22

 

Quick Guide to Measuring Temperature ................................ 22

 

Outline Dimensions ....................................................................... 23

 

Ordering Guide .......................................................................... 23

 

Automotive Products ................................................................. 23

 

REVISION HISTORY

6/12—Rev. 0 to Rev. A

Parameter from 5 μA to ±1 μA ....................................................... 3

1/12—Revision 0: Initial Version