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BQ40Z50:BQ40Z50的通讯问题

hongli zeng
Prodigy 30 points
Part Number: BQ40Z50
Other Parts Discussed in Thread: EV2400

Tool/software:

The problem I encountered in practical project applications is that we checked and tested the battery pack before leaving the factory, and found that the charging, discharging, and communication were all normal. But six months after leaving the factory, customers have reported that there are battery packs (about 10 out of 200-300pcs) that can be charged and discharged normally, but cannot communicate, even with EV2400,
However, these faulty battery packs were observed to have low levels of SCL and SDA using an oscilloscope. When EV2400 was turned on, SCL remained at 1 and SDA was observed to be low using an oscilloscope. After disconnecting the B-connection of the protection board, the B - was reconnected, and the charging, discharging, and communication of the battery pack were all normal again.
Could you please help analyze the possible causes.
thank you!

  • 0
    TI__Mastermind 27405 points

    Hello Hongli,

    This question has been assigned and will be reviewed when possible.

    Thank you,
    Alan 

  • 0
    TI__Mastermind 28490 points

    Hello,

    Disconnecting the device from the cells was most likely able to restart the SMBus engine of the device, allowing for communicate again. It is very difficult to determine a root cause of this since it is not possible to be logged, however this could of been the result of an ESD event. Is it possible to give more information about the application?

    Regards,

    Anthony