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Original question:

BQ24610: can't go in charge

BQ24610: Charge current is strange curve,and STAT1 low , STAT2 high?

Chen Yuan
Prodigy 110 points
Part Number: BQ24610

Hi,

Q1: If STAT1 is low , STAT2 is high , datasheet mean charge complete.

But it is still in charge from 20% to 85% full ( STAT1 is low , STAT2 is high all the time)

Is it mean that the IC BQ24610 is dead? 

Because i did not melt thermal pad.....i melt IC by hand....and charged about 7 hours yesterday.

Q2:  If i detect IC charge current has cycle.

I mean that when power on , the current is from 2.8A to 2.3A , and stop for a while about 10 second ,

and detect again   from 2.8A to 2.3A,is this correct??

Below is ISET1,ISET2,ACSET , i detect Vref is 3.3V.

All circuit is the same with datasheet application.

  • 0
    TI__Mastermind 25800 points
    Hey Chen,

    To question 1)

    From the datasheet, STAT1 ON and STAT2 OFF means Charge is in Progress. ON means the open-drain transistor is on, which externally means pulled LOW. OFF means the open-drain transistor is off, which externally means pulled HIGH. You are seeing the correct behavior.

    To question 2)

    I have having trouble understanding the behavior you're describing. Do you have a waveform you can provide?


    Regards,
    Joel H
  • 0 in reply to Joel Hernandez II
    Prodigy 110 points

    Hi,

    the final situation is stop at 99% full.

    We use power supply that could let battery to 100% full.

    But BQ24610 always stop at 99%.

    We detect  if there is no loading and VBat float from 12.1v to 13.3v,

    i mean it is not stable for voltage output.

    Is this correct?

    What do i need to try or fix?

    Icharge is 2A

    Iprecharge is 0.15A

    All other circuit is the same with datasheet.

    i think output is unstable that cause battery can't up to 100%.

  • 0 in reply to Chen Yuan
    TI__Mastermind 25800 points
    Hey Chen,

    This is not correct. Your battery can likely charger to 100% on a standard power supply because there is not termination current.

    However, on the charger the ISET2 pin will set the termination current threshold to stop charging when the battery voltage is deep in the CV mode. This means that at a charge current threshold (based on your configuration and assumption 10mOhm SRx resistor, this value is 210mA), the charger will stop and terminate charge. This is likely the remaining 1% you cannot get into the battery.


    Regards,s
    Joel H
  • 0 in reply to Joel Hernandez II
    Prodigy 110 points

    Hi,

    thx for your suggestion,

    but i had tried to set ISET2 as below,

    it still stop charging at 99% when current down to around 210mA,

    i mean it seems like no work to change ISET2,

    do you have other way to solve?

    Our guest request it must to be 100% full , please help.

    By the way, output is not stable , voltage will float,is this correct?

    If it is not correct , what should i do?(i follow datasheet and layout guide)

  • 0 in reply to Chen Yuan
    TI__Mastermind 25800 points
    Hey Chen,

    Try two things:

    1) Pull ISET2 to GND to set the minimum termination current of 125mA.
    2) Change the SRP/SRN sense resistor to 20mOhm to decrease the termination current by half to 62.5mA. This should extend the charge time and add a little more current to the circuit.

    Lastly, I want to ask how the customer is gauging the SoC? Do they have a gauge in their circuit? I would recommend they adjust their battery fuel gauge device to give 100% when the charge current reaches the termination threshold.


    Regards,
    Joel H
  • 0 in reply to Joel Hernandez II
    Prodigy 110 points

    Hi,

    thx,i would try these two points.

    Our guest have a gauge in their circuit of the battery(3 cell inside with circuit).

    And the battery is made by themself , so down the spec is impossible because they are guest.....

    Really thx for your help.