AD7280AWBSTZ Analog Devices Inc, AD7280AWBSTZ Datasheet - Page 2

• Manufacturer Part Number: AD7280AWBSTZ
• Description: IC BATT MON LI-ION AUTO 48LQFP
• Manufacturer: Analog Devices Inc
• Series: -r

Specifications of AD7280AWBSTZ

• Function: Battery Monitor, Over/Under Voltage Protection
• Battery Chemistry: Lithium-Ion (Li-Ion)
• Voltage - Supply: 8 V ~ 30 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AD7280A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 7
Pin Configuration and Function Descriptions ............................. 8
Typical Performance Characteristics ........................................... 11
Terminology .................................................................................... 14
Theory of Operation ...................................................................... 15
REVISION HISTORY
4/11—Revision 0: Initial Version
Power Specifications .................................................................... 5
Timing Specifications .................................................................. 6
Thermal Resistance ...................................................................... 7
ESD Caution .................................................................................. 7
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
Rev. 0 | Page 2 of 48
Register Map ................................................................................... 28
Serial Interface ................................................................................ 32
Daisy-Chain Interface .................................................................... 34
Examples of Interfacing with the AD7280A ............................... 38
EMC Guidelines ............................................................................. 44
Outline Dimensions ....................................................................... 46
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
Writing to the AD7280A ........................................................... 32
Reading from the AD7280A ..................................................... 33
Addressing the AD7280A While Reading Back Conversion
or Register Data .......................................................................... 34
Initializing the AD7280A .......................................................... 34
Write Acknowledge .................................................................... 35
Cyclic Redundancy Check ........................................................ 35
Convert and Readback Routine ............................................... 38
Examples ...................................................................................... 38
Schematic and Layout Guidelines ............................................ 44
Operation in a Noisy Environment ......................................... 44
Software Flowchart .................................................................... 45
Ordering Guide .......................................................................... 46
Automotive Products ................................................................. 46