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AD7280ABSTZ-RL Datenblatt(PDF) 2 Page - Analog Devices

Teilenummer AD7280ABSTZ-RL
Bauteilbeschribung  Lithium Ion Battery Monitoring System Cell balancing interface
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD7280ABSTZ-RL Datenblatt(HTML) 2 Page - Analog Devices

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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
 
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
 
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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