SLYY218 December 2022
A BCU consists of a communication chip and an MCU. The communication chip is the interface between the MCU and the CSU and BJB, translating signals from the daisy chain of the CSU and the BJB into a decoded bitstream to send to the MCU. The MCU polls all of the information measured by the CSU and BJB, calculates the battery status, and responds to faults or diagnostics from the CSU and BJB. Figure 7 shows a typical BCU block diagram.