Battery Monitoring Li-Ion/NiMH 48-Pin VQFN

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.

• 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
• Under voltage 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