Atmel公司的ATA6870是锂离子和NiMH电池组测量与监视电路, 主要用于混合动力汽车. ATA6870可管理多达16个电路,96个电池(三到六个电池组),为每个电池提供充电平衡能力,同时集成的线性稳压器用来给MCU或外接元件供电.本文介绍了ATA6870主要特性, 方框图, 一个和多个电池串的管理架构图,以及ATA6870 评估板系统框图和电路图.
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-shifters 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.

ATA6870主要特性:
• 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

ATA6870应用:
• Battery Measurement, Supply and Monitoring IC for Li-ion and NiMH Battery Systems in Electric (EV) and Hybrid Electrical (HEV) Vehicles 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

图1.ATA6870方框图

图2.一个电池串的管理架构图

图3.多个电池串的管理架构图

图4.ATA6870断电框图

图5.ATA6870和电池组间外接元件

图6. 内部电源的MCU电源

图7.外接电源的MCU电源

ATA6870 评估板
 
图8.ATA6870 评估板外形图

图9.ATA6870 评估板系统框图


图10.ATA6870 评估板电路图