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BQ25898D: About AD acquisition value

user777540
Expert 1020 points
Part Number: BQ25898D

hello,

When the battery is connected and VBUS is not connected, the AD acquisition value of VBUS etc. becomes the lower limit.
If the VBUS is not connected, will the AD value not be output normally?

Or if the battery voltage is low, will it not convert?
Please tell me the threshold.

best regards

  • 0
    TI__Guru**** 165886 points

    Hi,

    In battery only mode, the ADC only functions if the battery voltage sensed at BATP is higher than the VSYSMIN setting.  So if you change the VSYSMIN setting from 3.6V default to 3.0V, the ADC will function normally until the battery drops to 3.0V.

    Regards,

    Jeff  

  • 0 in reply to Jeff F
    Expert 1020 points

    hello,

    Should I check VSYS_STAT to see if it can be converted normally?

    I confirmed that VBUS is not connected, but the status does not change.

    Is it possible to check with VBUS connection?


    Is there a way to check if AD conversion is done normally without VBUS connected?

    best regards

  • 0 in reply to user777540
    TI__Guru**** 165886 points

    Hi,

    No.  VSYS_STAT is only valid when VBUS is attached.  I suggest using the VBUS or PG status bits.  If you disable the watchdog timer or ensure that the watchdog timer is being written to before lowering the SYSMIN voltage in REG03 to 3.0V, the ADC operates correctly until V(BATP) drops below 3.0V.

    Regards,

    Jeff