AD7280ABSTZ datasheet(2/48 Pages) AD

2 / 48 page

AD7280A

Rev. 0 | Page 2 of 48

TABLE OF CONTENTS

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

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

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

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

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

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

Power Specifications .................................................................... 5

Timing Specifications .................................................................. 6

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ........................................... 11

Terminology .................................................................................... 14

Theory of Operation ...................................................................... 15

Circuit Information.................................................................... 15

Converter Operation.................................................................. 15

Analog Input Structure.............................................................. 16

Transfer Function ....................................................................... 16

Typical Connection Diagrams.................................................. 17

Reference ..................................................................................... 19

Converting Cell Voltages and Auxiliary ADC Inputs ........... 19

Converting Cell Voltages and Auxiliary ADC Inputs

in a Chain of AD7280As............................................................ 21

Conversion Window .................................................................. 22

Self-Test Conversion .................................................................. 22

Connection of Fewer Than Six Voltage Cells ............................. 22

Auxiliary ADC Inputs................................................................ 23

Power Requirements .................................................................. 23

Power-Down ............................................................................... 24

Power-Up Time........................................................................... 25

Cell Balancing Outputs.............................................................. 25

Alert Output................................................................................ 27

Cell Voltage Registers ................................................................ 28

Auxiliary ADC Registers ........................................................... 28

Self-Test Register ........................................................................ 28

Control Register ......................................................................... 28

Cell Overvoltage Register.......................................................... 29

Cell Undervoltage Register ....................................................... 30

AUX ADC Overvoltage Register.............................................. 30

AUX ADC Undervoltage Register ........................................... 30

Alert Register .............................................................................. 30

Cell Balance Register ................................................................. 30

CBx Timer Registers .................................................................. 30

PD Timer Register...................................................................... 31

Read Register .............................................................................. 31

CNVST Control Register........................................................... 31

Serial Interface ................................................................................ 32

Writing to the AD7280A ........................................................... 32

Reading from the AD7280A ..................................................... 33

Daisy-Chain Interface.................................................................... 34

Addressing the AD7280A While Reading Back Conversion

or Register Data .......................................................................... 34

Initializing the AD7280A .......................................................... 34

Write Acknowledge.................................................................... 35

Cyclic Redundancy Check ........................................................ 35

Examples of Interfacing with the AD7280A............................... 38

Convert and Readback Routine ............................................... 38

Examples...................................................................................... 38

EMC Guidelines ............................................................................. 44

Schematic and Layout Guidelines............................................ 44

Operation in a Noisy Environment ......................................... 44

Software Flowchart .................................................................... 45

Outline Dimensions ....................................................................... 46

Ordering Guide .......................................................................... 46

Automotive Products ................................................................. 46

REVISION HISTORY

4/11—Revision 0: Initial Version

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