STMicroelectronics AEK-POW-BMS63EM Evaluation Board

Thanks to the two embedded transceivers, the board can be used as the first node in a BMS daisy chain, connected to a battery pack of six, ten (in configuration A or B, as detailed in UM3185), or 14 cells, and in a dual-access ring BMS chain. The board monitors the state of health (SOH) and state of charge (SoC) of each battery and manages battery balancing via passive discharge, thanks to the software already preloaded on the onboard SPC58NN84E7 microcontroller. The board is equipped with two CAN ports that support the versatile CAN2.0 protocol, enabling integration with multiple systems and efficient component communication.

The evaluation board hosts the following devices: SPC58NN84E7, L9963F, L9963T, LM2902W, and STGAP2GS. The SPC58NN84E7 automotive-grade microcontroller is responsible for calculating the SOH and the SoC of the connected battery pack, based on the measurement provided by the L9963F through the L9963T ISOSPI<>SPI transceiver. The L9963T transceiver, the MCU, and the L9963F communicate via the ISOSPI protocol, which uses differential communication for higher noise immunity. The LM2902W is used to sense the temperature in the battery ecosystem (that is, the temperature in the battery pack) through NTCs. The STGAP2GS keeps the control circuit and power circuit electrically separate (isolated), increasing system safety and robustness.

The STMicroelectronics AEK-POW-BMS63EM provides an elaborate monitoring network to sense the current, voltage, and temperature of each cell. This sensing allows elaborating the SoC of each battery cell and, consequently, the state of charge of all battery packs. The SoC allows assessment of the remaining battery capacity, which corresponds to the remaining driving range.