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BQ25703A: About battery removal test

Tsukui Yusuke
Guru 21930 points
Part Number: BQ25703A

Hi,

Customer is testing to remove the battery while it is charging.
Let me ask you two questions.

1.
Does this device automatically detect if the battery is removed while charging?
And Please tell me the expected operation when the battery is removed during charging.

2.
After removing the battery, Customer is trying to change the "CHRG_INHIBIT bit" setting with soft control.
Is this charge stop process correct when the battery is removed?
Could you tell me the recommended soft control method when removing the battery?

Best regards,
Yusuke

  • 0
    TI__Mastermind 24075 points

    Hi Yusuke-san,

    1.   There is no automatic battery absent detection. You will need external logic to pull CELL_BATPRESZ low to indicate battery removal. VSYS will be regulated at VSYS_MIN
    2. You can disable charge by using the CHRG_INHIBIT function. When this bit is set back 0, battery charging will start with valid values in the MaxChargeVoltage register and the ChargeCurrent register.

  • 0 in reply to Kedar Manishankar
    Guru 21930 points

    Hi Kedar-san,

    Thank you for your kind response.
    〉You will need external logic to pull CELL_BATPRESZ low to indicate battery removal. 

    Customer is currently connecting CELL_BATPRESZ to VDDA.
    (VDD voltage divider resistors are 33k and 100k.)

    Is it possible to control only the HRG_INHIBIT bit without setting B to Low?
    Could you tell me the risks and concerns of not setting B to Low when removing the battery?

    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 24075 points

    Hi Yusuke-san,

        By external logic, you would need a FET capable of pulling BATPRESZ low. If not, you can set charge current = 0A instead of setting CHRG_INHIB. VSYS will still be regulated at VSYSMIN.