ATA6870 Datasheet, PDF (1/55 Pages) ATMEL Corporation – Li-Ion, NiMH Battery Measuring, Charge Balancing and Power-supply Circuit

Features
• 12-bit Battery-cell Voltage Measurement
• Simultaneous Battery Cells Measurement in Parallel
• Cell Temperature Measurement
• Charge Balancing Capability
– Parallel Balancing of Cells Possible
• Integrated Power Supply for MCU
• Undervoltage Detection
• Less than 10 µA Standby Current
• Low Cell Imbalance Current (< 10 µA)
• Hot Plug-in Capable
• Interrupt Timer for Cycling MCU Wake-ups
• Cost-efficient Solution Due to Cost-optimized 30V CMOS Technology
• Reliable Communication between Stacked ICs Due to Level Shifters with Current
Sources and Checksum Monitoring of Data
• Daisy-chainable
– Each IC Monitors up to 6 Battery Cells
– 16 ICs (96 Cells) per String
– No Limit on Number of Strings
• Package QFN48 7 mm × 7 mm
Applications
• Battery Measurement, Supply and Monitoring IC for Li-ion and NiMH Battery Systems
in Electric (EV) and Hybrid Electrical (HEV) Vehicles
Li-Ion, NiMH
Battery
Measuring,
Charge
Balancing and
Power-supply
Circuit
ATA6870
Benefits
• Highest Safety Level for Li-ion Battery Systems in Combination with ATA6871
• Cost Reduction Due to Integrated Measurement Circuit and High Voltage Power-supply
Preliminary
1. Description
The ATA6870 is a measurement and monitoring circuit designed for Li-ion and NiMH
multicell battery stacks in hybrid electrical vehicles.
The ATA6870 monitors the battery-cell voltage and the battery-cell temperature with a
12-bit ADC.
The circuit also provides charge-balancing capability for each battery-cell.
In addition, a linear regulator is integrated to supply a microcontroller or other external
components. Reliable communication between stacked ICs is achieved by level-shift-
ers with current sources. The ATA6870 can be connected to three, four, five or six
battery-cells. Up to 16 circuits (96 cells) can be cascaded in one string. The number of
strings is not limited.
9116B–AUTO–10/09