Design of battery management module circuit based on DSP and OZ890-EEWORLD

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　　This design mainly realizes functions such as data acquisition, battery status calculation, balancing control, thermal management, various communications and fault diagnosis. The battery management system circuit consists of a power module, a DSP chip TMS320LF2407A (referred to as "LF2407"), a data acquisition module based on multiple OZ890s, an I2C communication module, an SCI communication module, and a CAN communication module. The OZ89 sampling module sends the collected and processed data to the LF2407 through the I2C bus. Since the LF2407 itself does not have an I2C interface, this design uses PCA9564 to expand its I2C interface. In order to prevent electromagnetic interference from affecting the transmission of data on the I2C bus, the bus signal must be isolated. Considering that the I2C bus is bidirectional, the ADuM1250 bidirectional isolation chip is used for isolation. PCA9564 and the bidirectional isolation circuit are shown in the figure.

Design of battery management module circuit based on DSP and OZ890

　　PCA9564 is an I2C bus expander, connected to the GPIO port of LF2407, it supports data transmission and reception in master-slave mode, LF2407 is set as the master device in BMS, and OZ890 is the slave device. LF2407 communicates with OZ890 by reading and writing the contents of four registers inside PCA9564. ADuM1250 is a hot-swappable digital isolator, which includes a non-latching, bidirectional communication channel compatible with the I2C interface. This eliminates the need to divide the I2C signal into a transmit signal and a receive signal for use by separate optocouplers .

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