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bq24167 Reset timing

PAN-M
Mastermind 8375 points
Other Parts Discussed in Thread: BQ24167

Dear all.

When bq24167 has finished charge state, /CHG and /PG are locked, and even if bq24167 recharge, a signal doesn't work.
When losing IN power, I think this state can be released.

How much time is needed to reset timing about bq24167?
It seems about 40 ms by measurement.

Regards,
PAN-M

  • 0
    TI__Guru**** 155606 points
    /PG shows state of voltage at IN or USB and is unreleated to charge. /CHG goes low (i.e., LED turns on) for the newcharge cycle only. It will not go low for a recharge cycle (i.e. battery charge terminates, battery discharges then battery charging resumes without input power power being removed and replaced). A new charge cycle is initiated only in the event of VSUPPLY POR or the battery being removed and replaced. I do not understand the timing question. Timing from what event to what event?
  • 0 in reply to Jeff F
    Mastermind 8375 points

    1.During charge state, /CHG will be low.
    2.When a charge ends, /CHG will be open drain.
    3.A battery isn't removed.
    4.The battery voltage decrease recharge voltage.
    5.bq24167 begins to recharge.
    6.But, /CHG won't be Low. (not charge state)
    We need re-insertion of a battery or a reset of a device for new chage state.
    I say reset that a toggled the IN voltage.
    Please teach the timing of turn off to me.

    PAN-M

  • 0 in reply to PAN-M
    TI__Guru**** 155606 points

    Your steps are correct.  A new charge cycle, which resets the /CHG pin, is initiated only in the event of VSUPPLY POR or the battery being removed and replaced.

  • 0 in reply to Jeff F
    Mastermind 8375 points

    I need attached timing.

    bq24167_reset.pptx

    Regards,
    PAN-M

  • 0 in reply to PAN-M
    TI__Guru**** 155606 points
    If IN drops below the UVLO threshold for 3us should be good enough to get the charge state machine to change states (assuming USB is also below UVLO).
    The /CHG pin change should follow in 4-6us.
    Keep in mind that, once input power rises above UVLO, bad source detection takes about 40ms before charging will restart.
  • 0 in reply to Jeff F
    Mastermind 8375 points
    I say to them that the system needs more than 40 ms.