Lithium Ion Battery Safety Monitor Data Sheet AD8280 FEATURES GENERAL DESCRIPTION Wide supply voltage range: 6.0 V to 30.0 V The AD8280 is a hardware-only safety monitor for lithium ion Multiple inputs can monitor 3 to 6 cell voltages battery stacks. The device has inputs to monitor six battery cells and 2 temperatures and two temperature sensors (either NTC or PTC thermistors). Adjustable threshold levels: overvoltage, undervoltage, The device is designed to be daisy-chained with additional AD8280 overtemperature devices to monitor a stack of significantly more than six cells Alarm options: separate or shared alarms without the need for numerous isolators. The output can be Extended temperature range performance configured for an independent or shared alarm state. 40C T +105C A The AD8280 functions independently from a primary Can be daisy-chained monitor and contains a reference and LDO, both of which are Internal reference powered completely from the battery cell stack. The reference, in Powered from battery stack conjunction with external resistor dividers, establishes trip points LDO available to power isolator for the overvoltages and undervoltages. Each cell channel contains Qualified for automotive applications programmable deglitching circuitry to prevent alarms from Extensive self-test feature aids in meeting ASIL/SIL transient input levels. requirements The AD8280 also has two digital pins that can select various APPLICATIONS combinations of inputs in the case where fewer than six cells are Lithium ion battery backup monitor and threshold detection to be monitored. Most important, it has a self-test feature, making Electric and hybrid electric vehicle it suitable for high reliability applications, such as automotive Industrial vehicle hybrid electric vehicles or higher voltage industrial usage, such as Uninterruptible power supply uninterruptible power supplies. The AD8280 can function over a Wind and solar temperature range of 40C to +105C. FUNCTIONAL BLOCK DIAGRAM OT AIINOV AIINUV AIINOT ENBO TESTO LDOS VTOP LDO REF FB UV OV VTOPS DGT0 LEVEL VBOT2 DGT1 SHIFTER LDO REF VBOT2S DGT2 VBOT1 GND2 VBOT1S GND1 SELF- DE- C6O TEST I/V GLITCHING VCC VIN6 GENERATOR CONVERTER LEVEL SHIFTER VCCS VIN5 DE- C6U GLITCHING TOP VIN4 BOT VIN3 VIN2 SEL0 ALARM LOGIC SEL1 VIN1 DE- C1O GLITCHING LEVEL VIN0 AVOUTOV SHIFTER DE- C1U GLITCHING AVOUTUV VT1 AVOUTOT DE- V/I CT1 GLITCHING CONVERTER VT2 NPTC DE- CT2 GLITCHING ALRMSEL AD8280 OT AIOUTOV AIOUTUV AIOUTOT ENBI TESTI OT Figure 1. Rev. E Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20102016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 08911-001AD8280 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Number of Cells Selection ......................................................... 18 Applications ....................................................................................... 1 Threshold Inputs ........................................................................ 18 General Description ......................................................................... 1 Top and Bottom Device Designation ...................................... 19 Functional Block Diagram .............................................................. 1 Typical Daisy-Chain Connections ........................................... 19 Revision History ............................................................................... 2 Shared or Separate Alarms ........................................................ 19 Specif icat ions ..................................................................................... 3 Deglitching Options ................................................................... 19 Absolute Maximum Ratings ............................................................ 5 Enabling and Disabling the AD8280 ....................................... 21 Thermal Resistance ...................................................................... 5 Alarm Output ............................................................................. 21 ESD Caution .................................................................................. 5 Self-Test ....................................................................................... 21 Pin Configuration and Function Descriptions ............................. 6 Protection Components and Pull-Up/Pull-Down Resistors 24 Typical Performance Characteristics ............................................. 8 EMI Considerations ................................................................... 24 Theory of Operation ...................................................................... 15 System Accuracy Calculation ................................................... 24 Applications Information .............................................................. 17 Outline Dimensions ....................................................................... 25 Typical Connections .................................................................. 17 Ordering Guide .......................................................................... 25 Cell Inputs ................................................................................... 17 Automotive Products ................................................................. 25 Temperature Inputs and Thermistor Selection ...................... 17 REVISION HISTORY 8/2016Rev. D to Rev. E 6/2011Rev. A to Rev. B Changes to Table 1 ............................................................................ 3 Changes to Table 1, Dynamic Performance, Self-Test Changes to Figure 42 and Figure 43 ............................................. 14 Valid Time, tstv Parameter ................................................................. 4 Changes to Table 7 .......................................................................... 19 Change to Figure 36, Figure 37, and Figure 39 ........................... 13 Changes to Self-Test Section ......................................................... 21 Changes to Self-Test Alarm Conditions Section and Self-Test 7/2010Rev. 0 to Rev. A Timing and Monitoring Strategy Section .................................... 22 Change to Logic 1 Voltage Input, V Parameter in Table 1 ........ 3 IH Changes to Figure 52 ...................................................................... 23 Changes to Temperature Inputs and Thermistor Selection S ection .............................................................................................. 17 8/2014Rev. C to Rev. D Added Figure 46 Renumbered Figures Sequentially ................ 17 Changes to Table 2 ............................................................................ 5 Changes to Endnote 1 in Table 6 .................................................. 18 Changes to Ordering Guide .......................................................... 24 7/2011Rev. B to Rev. C Changes to Self-Test Completion Time, t Parameter and Self- 4/2010Revision 0: Initial Version ST Test Valid Time, t Parameter in Table 1 .................................... 3 STV Rev. E Page 2 of 25