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BQ76940: Static electricity discharging issue

Cherry Zhou
Mastermind 22235 points
Part Number: BQ76940
Other Parts Discussed in Thread: BQ76200

Hi team,

Here's an issue from the customer may need your help:

The device will stuck when discharging static + 4 kV, and it will resume normal when resetting MCU. The customer would like to know what' the reason for that. Could you help check this? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 42060 points

    Hello Cherry, 

    Could you describe what issue exactly is the customer is seeing when the device is "stuck" ? 

    Usually with ESD you want to keep the current from it away from the electronics that can be sensitive to large transients.

    Sharing their schematic would be helpful.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    TI__Mastermind 22235 points

    Hello Luis,

    Luis H. S. said:
    Could you describe what issue exactly is the customer is seeing when the device is "stuck" ? 

    IIC still has communication, 3.3V supply has no output. The 12-string sample voltage on the upper computer is 16 mV,  all 3 temperature samples are -30°C. Restart the power supply, it can work normally.

    Luis H. S. said:
    Sharing their schematic would be helpful.

    The schematic is similar to the 8.2's of BQ76200.

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Mastermind 42060 points

    Hello Cherry,

    I noticed you opened a new thread with this question. 

    I will close this thread and it can be continued in the other thread.

    Best Regards,

    Luis Hernandez Salomon