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BQ24160: BQ24160:Can't charge when the battery is discharged to 0.0001v?

li jongyann
Prodigy 90 points
Part Number: BQ24160

Hi ,I have a question,

Can't charge when the battery is discharged to 0.0001v?

A.termination current is set to 150mA,
    Enable charge current termination :1 --> Unable to charge
    Enable charge current termination :0 --> Can be charged, charging current is about 20mA
    Is this application normal?

B. Does the setting of the termination current only apply when the fast charge is completed?

  • 0
    TI__Guru**** 166826 points

    Li,

    When termination is disabled the BATSHORT circuitry is also disabled so no IBATSHORT current when the battery is below the VBATSHORT threshold.  

    Termination current threshold is where the battery stops charging when the charger is tapering in Constant voltage mode.

  • 0 in reply to Jeff F
    Prodigy 90 points
    Hi Jeff,
    when the battery is discharged to 0.0001v,
    How to set up BQ24160 to charge?
    Thank you
  • 0 in reply to li jongyann
    TI__Guru**** 166826 points
    Li,

    I was wrong in the post above. Disabling termination does not disable the IBATSHORT current. I just tested on the bench and the IBATSHORT current =50mA flows from VBAT=3.0V down to 0V as long as there is no TS fault and /CE bit is enabled. Unfortunately, there is no way to change this IBATSHORT current value until V(BAT) rises above 3.0V.
  • 0 in reply to Jeff F
    Prodigy 90 points

    Hi jeff,

    1. 6 seconds before the film explains:

        The discharged battery is vbat=0v before the power is turned on.

        After the power is turned on, the vbat jumps in the 1v~3v interval.

        Gui is displayed as "bat fault",

        How do I charge a discharged battery?

    2. The film 7 seconds ~ 14 seconds Description:

        I tried to turn off charge termination after vbat=3.6v

        Gui shows "charging from in",

        Is this method correct?

  • 0 in reply to li jongyann
    TI__Guru**** 166826 points

    With charge and/or charge termination enabled, the battery runs a battery detection routine that results in a square-ish waveform on BAT.  If you want to force current to flow out of BAT until the voltage at BAT reaches VBATREG, you would need to disable charge termination.  It appears that your discharged battery's protector requires more than the 50mA of current that charger sources out of BAT during battery detection to close.