ATA6871 Datasheet, PDF (1/23 Pages) ATMEL Corporation – Li-ion Battery Management Monitoring Emergency and Backup Circuit

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
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