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BQ4050: RSOC remains at 99%, VCT is not set

Frank_
Prodigy 120 points
Part Number: BQ4050

Hello,

in my BMS design (2p2s), RSOC remains at 99%. Because of "SBS Gauging Configuration[RSOCL]" = 1, I need a Valid Charge Termination to update RSOC to 100%.

However, the VCT flag, located in ChargingStatus(), remains at 0.

According to SLUUAQ3, VCT requires the following conditions:

- BatteryStatus()[DSG] = 0

- AverageCurrent() < "Advanced Charge Algorithm/Termination Config/Charge Term Taper Current" (250mA)

- ChargingVoltage() / num of serial cells ≤ "Max cell voltage1..4" + "Advanced Charge Algorithm/Termination Config/Charge Term Voltage" (75 mV)

- the accumulated change in capacity > 0.25 mAh

my questions:

1) I am not sure about "Max Cell Voltage 1...4" used in the technical reference. Can anyone confirm that we are talking about these parameters:

"Lifetimes/Voltage/Cell 1 Max Voltage"
"Lifetimes/Voltage/Cell 2 Max Voltage"
"Lifetimes/Voltage/Cell 3 Max Voltage"
"Lifetimes/Voltage/Cell 4 Max Voltage"

2) How can I know the accumulated change in capacity ?

Thank you in advance.

Frank

  • 0
    TI__Mastermind 42535 points

    Hi Frank,

    No, the lifetime values are not the max values used for chg termination. You need to look at the registers at the point where the cell voltage is at the highest during charging and then use that.

    The accumulated change capacity can't be read from this gauge, you will have to integrate current over time to get it if you are logging it.