AD7280A
TABLE OF CONTENTS
Features .............................................................................................. 1
Register Map ................................................................................... 28
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
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
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
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
REVISION HISTORY
4/11—Revision 0: Initial Version
Rev. 0 | Page 2 of 48
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