STMicroelectronics Battery Management System Module Based On L99BM114 and L99BM1T Battery Monitoring Controller

The STMicroelectronics Battery Management System (BMS) evaluation board that manages from 4 to 14 battery cells. The main advantage of this evaluation board is ensuring isolated connection to an external MCU, due to the embedded transceiver. The board is based on the L99BM114 Li-ion battery monitoring and protection chip for high reliability applications and the L99BM1T general-purpose SPI to isolated SPI bidirectional transceiver. The main activity is monitoring the cells and battery node status through stack voltage measurement, cell voltage measurement, temperature measurement, and coulomb counting.

• Current sensing of the entire battery node
• 5 GPIOs to connect temperature sensors as NTCs
• CN1 connector that allows establishing communication with an MCU board via SPI
• CN2 connector that interfaces directly to an MCU board for control and diagnostic functions
• Passive balancing
• Compact size 100 mm x 76 mm