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BQ27426: Learning Cycle

user4369354
Expert 1220 points
Part Number: BQ27426
Other Parts Discussed in Thread: GPCRB

Dear Sir,

Please confirm the following question.

1. When is the FCC updated?
2. In our products, SOC jumps (5 -> 0%)near the end voltage (3.3V). What should I do to avoid jumping (5 -> 4 -> 3 -> 2 -> 1 -> 0%)?
3. Is there any way to check which measurement algorithm is detected as DISCHARGE, CHARGE, and RELAXATION (for example, flags etc.)?
4. Current consumption of our products is as follows.

190724_Consumption current.xlsx
   How much value should I set the current threshold and the relax time?And do peak currents affect the detection of each relaxation mode?

Best regards,
Chiaki Endo

  • 0
    TI__Guru* 76230 points

    1. FCC is primarily updated at grid points and the start and end of charge. At the start and end of discharge and also when ever there is a temp change by more than 5degC.

    2. Is this jumps occuring at room temp or at cold temp. If room temp, then it means that the gauge didn't learn properly. If cold temp, then you need to optimize the gauge using our online tool gpcrb. Also , make sure that teh bat_det flag in bit registers is set.

    3. When in charge mode, the dsg flag will clear and chg will be set. When in dsg and rest mode, the dsg flag will be set. There is no specific flag indicating rest.

    4. Quit current threshold is what determines the gauge is in relax mode. It should be set to a value slightly above the current draw when your device is i low power state. If the low power state of your device is 20mA with 100mA spikes, quit current should be set to about 25mA so that the device will be able to enter relax mode. In this example dsg current threshold should be set to 30-35mA .

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Expert 1220 points

    Dear Onyx san,

    2. The measurement is performed at room temperature, and the bat_det flag is set.
    Are there any other causes of jumps?

    Best regards,
    Chiaki Endo

  • 0 in reply to user4369354
    Expert 1220 points

    Dear Onyx san,

    Please respond as soon as possible about the matter that I made an inquiry about to you the other day.

    Best regards,
    Chiaki Endo

  • 0 in reply to user4369354
    TI__Guru* 76230 points

    hi Chiaki-san

    I believe you have been working with our Engineer offline about your issues. I would recommend streamlining the support and keep your requests to just one medium to avoid getting confused. You need to ensure you learn properly and have the smoothing function enabled.

    thanks

    Onyx