AD8280 Datasheet PDF - Analog Devices

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AD8280
Analog Devices

Part Number AD8280
Description Lithium Ion Battery Safety Monitor
Page 26 Pages


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Data Sheet
Lithium Ion Battery Safety Monitor
AD8280
FEATURES
GENERAL DESCRIPTION
Wide supply voltage range: 6.0 V to 30.0 V
Multiple inputs can monitor 3 to 6 cell voltages
and 2 temperatures
Adjustable threshold levels: overvoltage, undervoltage,
overtemperature
Alarm options: separate or shared alarms
Extended temperature range performance
−40°C ≤ TA ≤ +105°C
Can be daisy-chained
Internal reference
Powered from battery stack
LDO available to power isolator
Qualified for automotive applications
Extensive self-test feature aids in meeting ASIL/SIL
requirements
APPLICATIONS
Lithium ion battery backup monitor and threshold detection
Electric and hybrid electric vehicle
Industrial vehicle
Uninterruptible power supply
Wind and solar
The AD8280 is a hardware-only safety monitor for lithium ion
battery stacks. The device has inputs to monitor six battery cells
and two temperature sensors (either NTC or PTC thermistors).
The device is designed to be daisy-chained with additional AD8280
devices to monitor a stack of significantly more than six cells
without the need for numerous isolators. The output can be
configured for an independent or shared alarm state.
The AD8280 functions independently from a primary
monitor and contains a reference and LDO, both of which are
powered completely from the battery cell stack. The reference, in
conjunction with external resistor dividers, establishes trip points
for the overvoltages and undervoltages. Each cell channel contains
programmable deglitching circuitry to prevent alarms from
transient input levels.
The AD8280 also has two digital pins that can select various
combinations of inputs in the case where fewer than six cells are
to be monitored. Most important, it has a self-test feature, making
it suitable for high reliability applications, such as automotive
hybrid electric vehicles or higher voltage industrial usage, such as
uninterruptible power supplies. The AD8280 can function over a
temperature range of −40°C to +105°C.
FUNCTIONAL BLOCK DIAGRAM
OT
VTOP LDO
LDOS REF FB
AIINOV AIINUV AIINOT ENBO TESTO
UV OV
VTOPS
VBOT2
VBOT2S
VBOT1
VBOT1S
VIN6
VIN5
VIN4
VIN3
LDO
LEVEL
SHIFTER
REF
C6O
DE-
GLITCHING
C6U
DE-
GLITCHING
I/V
CONVERTER
LEVEL
SHIFTER
DGT0
DGT1
DGT2
GND2
SELF-
TEST
GENERATOR
GND1
VCC
VCCS
TOP
BOT
VIN2
VIN1
VIN0
LEVEL
SHIFTER
VT1
VT2
AD8280
C1O
DE-
GLITCHING
C1U
DE-
GLITCHING
CT1
DE-
GLITCHING
DE-
CT2 GLITCHING
ALARM
LOGIC
V/I
CONVERTER
SEL0
SEL 1
AVOUTOV
AVOUTUV
AVOUTOT
NPTC
ALRMSEL
OT
AIOUTOV
AIOUTUV AIOUTOT
ENBI TESTI
OT
Figure 1.
Rev. E
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Tel: 781.329.4700 ©2010–2016 Analog Devices, Inc. All rights reserved.
Technical Support
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Last Content Update: 11/01/2016
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• Emerging Energy Applications Solutions Bulletin, Volume
10, Issue 4
Technical Articles
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AD8280
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 5 
Thermal Resistance ...................................................................... 5 
ESD Caution.................................................................................. 5 
Pin Configuration and Function Descriptions............................. 6 
Typical Performance Characteristics ............................................. 8 
Theory of Operation ...................................................................... 15 
Applications Information .............................................................. 17 
Typical Connections .................................................................. 17 
Cell Inputs ................................................................................... 17 
Temperature Inputs and Thermistor Selection ...................... 17 
REVISION HISTORY
8/2016—Rev. D to Rev. E
Changes to Table 1............................................................................ 3
Changes to Figure 42 and Figure 43............................................. 14
Changes to Table 7.......................................................................... 19
Changes to Self-Test Section ......................................................... 21
Changes to Self-Test Alarm Conditions Section and Self-Test
Timing and Monitoring Strategy Section.................................... 22
Changes to Figure 52...................................................................... 23
8/2014—Rev. C to Rev. D
Changes to Table 2............................................................................ 5
7/2011—Rev. B to Rev. C
Changes to Self-Test Completion Time, tST Parameter and Self-
Test Valid Time, tSTV Parameter in Table 1 .................................... 3
Data Sheet
Number of Cells Selection......................................................... 18 
Threshold Inputs ........................................................................ 18 
Top and Bottom Device Designation ...................................... 19 
Typical Daisy-Chain Connections ........................................... 19 
Shared or Separate Alarms........................................................ 19 
Deglitching Options................................................................... 19 
Enabling and Disabling the AD8280 ....................................... 21 
Alarm Output ............................................................................. 21 
Self-Test ....................................................................................... 21 
Protection Components and Pull-Up/Pull-Down Resistors 24 
EMI Considerations................................................................... 24 
System Accuracy Calculation ................................................... 24 
Outline Dimensions ....................................................................... 25 
Ordering Guide .......................................................................... 25 
Automotive Products ................................................................. 25 
6/2011—Rev. A to Rev. B
Changes to Table 1, Dynamic Performance, Self-Test
Valid Time, tstv Parameter .................................................................4
Change to Figure 36, Figure 37, and Figure 39........................... 13
7/2010—Rev. 0 to Rev. A
Change to Logic 1 Voltage Input, VIH Parameter in Table 1 ........3
Changes to Temperature Inputs and Thermistor Selection
Section.............................................................................................. 17
Added Figure 46; Renumbered Figures Sequentially ................ 17
Changes to Endnote 1 in Table 6.................................................. 18
Changes to Ordering Guide .......................................................... 24
4/2010—Revision 0: Initial Version
Rev. E | Page 2 of 25



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Data Sheet
SPECIFICATIONS
VTOP = 7.5 V to 30 V, TA = −40°C to +105°C, unless otherwise noted.
Table 1.
Parameter
TRIP POINT ERRORS
Undervoltage Trip Point Error
Overvoltage Trip Point Error
Overtemperature Trip Point Error
Hysteresis for Overvoltage, Undervoltage,
and Overtemperature Trip Points
CELL INPUTS (VIN0 TO VIN6)
Input Bias Current
Input Offset Current
Input Voltage Range
Input Common-Mode Range
Test Conditions/Comments
One cell
Min
−25
−15
−25
40
0
0
0
0
TEMPERATURE INPUTS (VT1, VT2)
Input Bias Current
Input Voltage Range
OVERVOLTAGE THRESHOLD INPUT (OV)
Input Bias Current
Input Voltage Range
UNDERVOLTAGE THRESHOLD INPUT (UV)
Input Bias Current
Input Voltage Range
OVERTEMPERATURE THRESHOLD INPUT (OT)
Input Bias Current
Input Voltage Range
INPUT/OUTPUT CHARACTERISTICS
Logic 1 Current
Logic 0 Current
Logic 1 Voltage Input, VIH
All Pins Except TOP and BOT
TOP and BOT Pins
Logic 0 Voltage Input, VIL
All Pins Except TOP and BOT
TOP and BOT Pins
Logic 1 Voltage Output, VOH
Logic 0 Voltage Output, VOL
Input Bias Current
REFERENCE AND LDO
Reference Voltage
Reference Source Current
LDO Voltage
LDO Source Current
DYNAMIC PERFORMANCE
Fault Detection (Deglitch) Time Range
Fault Detection (Deglitch) Accuracy
Propagation Delay Time
Start-Up Time
AIINxx, AIOUTxx
AIINxx, AIOUTxx
With respect to VBOTx
With respect to VBOTx
With respect to VBOTx
With respect to VBOTx
SEL0, SEL1, DGT0, DGT1, DGT2, NPTC, ALRMSEL
0 mA ≤ LDO source current ≤ 10.0 mA
Seven settings: 0.0 sec, 80 ms, 625 ms,
1.25 sec, 2.5 sec, 5.0 sec, and 10.0 sec
No capacitor on daisy chain
From application enabled to LDO = 90% of value
−10
0
0
3.6
0
1.4
0
1.5
100
10
2.0
VTOP
4.2
4.95
4.85
0.0
−20
Typ
50
150
30
5.0
5.1
4.0
AD8280
Max Unit
+25 mV
+15 mV
+25 mV
60 mV
20
20
5
Top of
stack
+10
5
20
4.6
20
3.3
20
4
200
50
LDO
0.8
VBOT
0.2
1
5.05
250
5.35
5.0
10.0
+20
3.0
nA
nA
V
V
nA
V
nA
V
nA
V
nA
V
µA
µA
V
V
V
V
V
V
µA
V
µA
V
mA
sec
%
µs
ms
Rev. E | Page 3 of 25



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