ATA6871 ATMEL Corporation, ATA6871 Datasheet

ATA6871

Manufacturer Part Number

ATA6871

Description

Li-ion Battery Management Monitoring Emergency and Backup Circuit

Manufacturer

ATMEL Corporation

Datasheet

1.ATA6871.pdf (23 pages)

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Features

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Applications

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Benefits

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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.

Overvoltage Monitoring

Undervoltage Monitoring

Cell Temperature Monitoring

Self-diagnosis including

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

Package SSO28

Backup Battery-Cell Monitoring System for Li-ion Batteries

Emergency Indicator in Li-ion Batteries

Monitoring System in Li-ion Batteries

Highest Safety Level for Li-ion Battery Systems

Circuit Customization, e.g. Over and Undervoltage Thresholds, Possible for Large

Production Volumes

– Comparator Functions

– Communication Lines

– Short and Open Measuring Lines

– 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

Li-ion Battery

Management

Monitoring

Emergency and

Backup Circuit

ATA6871

Preliminary

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9123B–AUTO–07/09

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