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BQ25730: About EN_SHIP_DCHG function

diverger
Expert 1275 points
Part Number: BQ25730


Hi,

I'm not very clear about the function of 'EN_SHIP_DCHG'.  When to use it or what's the use case of this bit? May someone explain more?

Thanks.

  • 0
    TI__Guru**** 168456 points

    Hi Diverger,

    The engineer who supports this IC is out until Jan 3rd or later.  I will notify him of this post but I recommend that you also respond back to this thread on Jan 3rd.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Expert 1275 points

    Hi Jeff,

    Are there anyone can answer my question now?

  • 0 in reply to diverger
    TI__Mastermind 34105 points

    Hi Diverger,

    Thanks for your patience. The user case is, when the end equipment is built and put on the shelf. We would like to enable the battery ship mode, so the battery won't be discharged after a long period of shelf time, for example months. 

    To wake up the battery in ship mode, the charger will charge up the VBAT to a pre-determined voltage. 

    To avoid waking up the battery in ship mode, the charger will discharge the battery cap to ground or a low voltage, provided the battery is in ship mode, by setting EN_SHIP_DSG =1. 

    Hope this helps. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Expert 1275 points

    Hi,

    What do you mean 'battery cap'? This is what confused me. If it means a capacitor connected to the battery, then how to discharge the capacitor without discharging the battery? Or it means disable the battery FET then discharge the cap?

    Thanks.

  • 0 in reply to diverger
    TI__Mastermind 34105 points

    It first needs to disable the battery FET (inside the battery), then discharge the cap outside the battery.