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PDF ATA6871 Data sheet ( Hoja de datos )
| Número de pieza | ATA6871 | |
| Descripción | Li-ion Battery Management Monitoring Emergency and Backup Circuit | |
| Fabricantes | ATMEL Corporation | |
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Features
• Overvoltage Monitoring
• Undervoltage Monitoring
• Cell Temperature Monitoring
• Self-diagnosis including
– Comparator Functions
– Communication Lines
– Short and Open Measuring Lines
• Hot Plug-in Capable
• Less than 10 µA Stand-by Current
• Low Cell Imbalance Current (< 10 µA)
• Circuit Customization, e.g. for Over/Undervoltage Thresholds Possible for Adequate
Volumes
• Cost-efficient Solution Due to Cost Optimized 30V CMOS Technology
• Daisy-chainable
– Each IC Monitors 6 Battery Cells
– 16 ICs (96 Cells) per String
– No Limit on Number of Strings
– Reliable Communication between Stacked ICs Due to Level Shifters with Current
Sources
• Package SSO28
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Li-ion Battery
Management
Monitoring
Emergency and
Backup Circuit
ATA6871
Applications
• Backup Battery-Cell Monitoring System for Li-ion Batteries
• Emergency Indicator in Li-ion Batteries
• Monitoring System in Li-ion Batteries
Preliminary
Benefits
• Highest Safety Level for Li-ion Battery Systems
• Circuit Customization, e.g. Over and Undervoltage Thresholds, Possible for Large
Production Volumes
1. General Description
The ATA6871 is a battery cell monitoring circuit designed to act as an emergency,
safety, or backup circuit in Li-ion battery systems for electrical and hybrid electrical
vehicles (EV/HEV). It monitors overvoltage, undervoltage, and the cell temperature in
Li-ion batteries without the need of a microcontroller. The circuit has an advanced
self-test functionality, which checks the proper functionality of the monitoring compar-
ators as well as the communication lines. It can be used as a monitoring circuit as well
as an emergency indicator or as a backup system in Li-ion battery management sys-
tems. The ATA6871 can monitor four, five, or six battery cells. Up to 16 IC’s can be
cascaded. If one or more battery cells exceed the over or undervoltage thresholds for
longer than 2 seconds, or if the temperature input exceeds the temperature limit for
more than 2 seconds, a digital output signal is set to high.
9123B–AUTO–07/09
1 page  
ATA6871 [Preliminary]
4. System Overview
The ATA6871 can be stacked in one string up to 16 times.
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Figure 4-1. Battery Management Architecture with one Battery String
ATA6871
ATA6871
ATA6871
ATA6871
2
Status/
Battery
Cells
OK, not OK
9123B–AUTO–07/09
5
5 Page 
ATA6871 [Preliminary]
www.DataSheet4U.com
The circuit will suppress failures detected during the self test and provide only results from good
tested comparators connections to pin OROUT. This enables the system to monitor the rest of
the battery cells if one connection/comparator fails. If, for example, the connection of the
OROUT signal between two ATA6871s is open, the OROUT_IN signal of the lower ATA6871 will
be ignored, but all the cells of this ATA6871 and ICs below will be observed in the normal way. If
the battery cell voltage exceeds 4.9V or is below 1.5V during the self-diagnosis, the affected
comparator will be detected as defect, and the output of the affected comparator will be also
suppressed until the next self diagnosis.
If, after the self test has passed, one of the comparator in the stack detects under or overtemper-
ature at a battery cell, the output OROUT switches from low to high. The battery cell
undervoltage detection can be disabled with the digital input ENUV.
Table 7-2. Electrical Characteristics
No. Parameters
Test Conditions
Pin
Symbol Min.
Typ.
Max.
2.1 Supply voltage
2.2 Current consumption
2.3 Input current
2.4 Digital output signal
No external load
Self diagnosis
ongoing or failed
Self diagnosis passed
successful
VDDHV
VDDHV
MBAT(i)
STATUS
VVDDHV
IVDDHV
IMBAT(i)
VSTATUS
6.9 30
6
5
Constant
low
15
Toggle
frequency
50
2.5 Self diagnosis time
i = number of stacked
ICs
tselfdiag
2+
0.85 × i
8+
2.2 × i
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Unit
V
mA
µA
Hz
ms
Type*
A
A
A
A
A
B
7.2 Battery Cell Over and Undervoltage Detection
If, after the self diagnosis of the chip has passed, one of the monitored battery cell voltages
V(MBATi+1) - VMBATi is above the overvoltage threshold or below the undervoltage threshold for
t > tDebounce, the OROUT output goes high. The battery cell undervoltage detection can be dis-
abled with the digital input ENUV.
Table 7-3.
PIN
ENUV
Truth Table:
Symbol
VENUV
Value
0
1
Function
Undervoltage detection disabled
Undervoltage detection enabled
9123B–AUTO–07/09
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ATA6871.PDF ] | |
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