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BQ25882: About Battery insertion / removal judgment

Tsukui Yusuke
Guru 21930 points
Part Number: BQ25882

Hi,

Can the BQ25882 determine whether the battery is inserted or removed?
Please let me know if there is a way to determine ”Battery insertion / removal”.

And, When I removed the battery with the following settings, it repeated CV and Trickle.
・EN_BAT_DISCHG = Enable
・TOPOFF_TIMER[1:0] = Disable
Is this judgment made by "VBAT <VBAT_SHORT"?
I want to know the details of the criteria and rules for switching between Trickle and CV.

Best regards,
Yusuke

  • 0
    TI__Genius 10385 points

    Yusuke-san,

    The BQ25882 uses a discharge current to detect the presence of a battery.

    The repeated trickle and CV is the VBAT capacitor charging and discharging. The VBAT_SHORT threshold determines when to exit trickle and begin precharge.

    Thanks,

    Ricardo

  • 0 in reply to Ricardo
    Guru 21930 points

    Hi Ricardo-san,

    Thank you for your response.
    I understand your explanation.
    Could you tell me additionally.
    〉The BQ25882 uses a discharge current to detect the presence of a battery.
    〉The repeated trickle and CV is the VBAT capacitor charging and discharging. 

    Could you tell me the threshold of discharge current detection?
    We want to know the details of bq25882 operation when inserting and removing the battery.

    Best regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Genius 10385 points

    Yusuke-san,

    The discharge is applied to determine which charge state to begin. When the discharge is applied the VBAT voltage is sensed and the appropriate charging state will begin.

    VBAT > VBAT_LOWV : Fast Charge begins

    VBAT_LOWV > VBAT > VSHORT : Precharge begins

    VSHORT > VBAT: Trickle begins

    Thanks,

    Ricardo