Datasheet

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
I
2
C 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
T
HIGH
Setpoint Registers ............................................................. 15
T
LOW
Setpoint Registers .............................................................. 15
T
CRIT
Setpoint Registers .............................................................. 15
T
HYST
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