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BQ40Z50-R1: Qmax and Ra table no update and FCC strange

Che yi Su
Expert 1695 points
Part Number: BQ40Z50-R1

Hi all,

I found my pack Qmax and Ra table no update and FCC strange after Golden learning. I had send GAUGE_EN then send RESET command  or only sned GAUGE_EN command, but it was no use. Enclosed my log and GG aompare data, please refer to it, thank you.

Battery：1S8P, 19200mAh.

GG Compare.xlsx

20180301 - Log.xlsx

  • 0
    TI__Expert 6575 points
    Hi,
    The main issue is that for the first learning cycle, the gauge needs a minimum 90% change in DOD to learn the Qmax accurately.
    I would recommend, only for this learning cycle, to change the charging to the full 4.2V spec of the cell, and also reducing the taper current to 200mA and discharge current by 25% so that it will have a better chance to get the 90% DOD change.
    currently from the log it looks like it is getting 84-86% DOD change.
    Regards,
    Swami