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Original question:

BQ27542-G1: charge termination

BQ40Z50-R2: NCT Flag Judgement Condition

Che yi Su
Expert 1695 points
Part Number: BQ40Z50-R2


Hi TI experts,

Would you tell me Near Charge Termination(NCT) flag judgement condition?

  • 0
    TI__Guru* 81035 points
    Hi,

    This is best described by the setting description for CHG_100_SMOOTH_OK in the TRM:

    [CHG_100_SMOOTH_OK]: This handles smoothing in the charge direction to 100%. For jumps to 100%
    during charge, this feature uses the taper termination detection logic to predict when charge termination
    will occur. The taper termination logic requires two consecutive 40-s windows that meet all taper
    conditions. After the first 40-s window is satisfied, time-based smoothing will be initiated, smoothing
    RemCap to smoothed FCC over the next 40-s window. It is important to note that smoothed RemCap will
    converge to smoothed FCC and not True RemCap.

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Expert 1695 points
    Hi Matt,
    Thanks for your answer. Is it mean calculate first-40 sec average current to indicate taper current when NCT=1? Even I don't have GG file, but I can use the rule to know taper current.
  • 0 in reply to Che yi Su
    TI__Guru* 81035 points
    Yes, valid charge termination is qualified by 2 40 second periods where the average current is below the taper current (other conditions are shown in table in Section 4.6 of the TRM). Once the first 40 second window is qualified, the smoothing with start to avoid a sudden jump to in the RemCap.

    Best regards,
    Matt