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BQ76952: After deep sleep, the static consumption of charging fault protection

mark zuo
Prodigy 150 points
Part Number: BQ76952

Dear TI engineer，

          When the battery goes into deepsleep, the charger charges the battery. If the BMS fails, such as charging over temperature protection, it is forbidden to charge the battery at this time, but the external charger always has voltage, which causes the BQ76952 to be active, consume 300uA, and will quickly consume the limited power of the battery.

          Faced with this situation, what advice do you have (regardless of changing the charger type)? Does BQ76952 have a similar charging timeout function? For example, even if an external charger is detected, but no charging current is detected for a certain period of time, the BQ76952 will ignore the charger and go into deepsleep. 

            

  • 0
    TI__Mastermind 42060 points

    Hello Mark,

    The device has the FETs off during DEEPSLEEP, so it should not be able to charge the battery in DEEPSLEEP. If a charger is placed, the device exits DEEPSLEEP by detecting the LD pin rising over VWAKEONLD.I don't believe there is a way to bypass the LD wake-up. The device will not be able to go into SHUTDOWN or DEEPSLEEP until the LD voltage is removed.

    You may be able to control it using additional circuitry, like a FET switch, in order to keep the LD pin separate when you want the device to remain in DEEPSLEEP. It'd be up to you to find how to implement something like this. We have a brief talk about controlling the LD pin for low-side applications in our Low-Side Application Report.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 150 points

    Dear Luis，

               Remove the LD pin and use the MCU to control the TS2 to wake up? 

  • 0 in reply to mark zuo
    TI__Mastermind 42060 points

    Hello Mark,

    TS2 can only be used to WAKE from SHUTDOWN, not DEEPSLEEP. See Figure 7-1. Operational Modes of the TRM to see entry and exit conditions for each operational mode.

    I asked some others in the team to see if there was a way to achieve your desired behavior. It seems like there is not, it is the way that the part is built, the LD pin would only be able to be unused if the DSG FET is not being used. Which in this case it can be pulled to Vss.

    The charge voltage seems like will always WAKE the device when connected.

    I apologize for the issues on this.

    Best Regards,

    Luis Hernandez Salomon