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Original question:

BQ4050: Issue of BQ4050RSMR SOC Jump

BQ4050: Issue of BQ4050RSMR SOC Jump

Gabriel Wang1
Genius 4715 points
Part Number: BQ4050

Dear Expert

At present, the BQ4050 coulometer produced by our company encounters the problem of charging to 80%, then shelved for 6 hours, and then charged to 100%. The local temperature was 5 degrees Celsius.

The detailed data has been logged out. Please help analyze it.

We test in 25℃ 28℃ 35℃ ，then charge the defective products from 80% to 100% ，there is date with no jump .

HN-GT200B-5deg-CH1.csv

  • 0
    TI__Guru** 105600 points

    Hello Gabriel,

    The reads have lots of error in the region where RSOC jumps and it is hard to tell exactly what is occurring. Did they enter shutdown mode for some period of time? If the gauge goes through any type of reset it will recalculate based on the voltage, which will cause SOC jump.

    CSYNC can also caused forced FCC=RemCap at VCT, can you share the .gg file?

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Genius 4715 points

    Dear Wyatt

    Today, the charging data of BQ4050 coulometer product at low temperature of 10° and 15° have been log out, and the phenomenon of jump has been completely reproduced. Please help to analyze it.

    1. At a low temperature of 10°, charge defective products from 0% to 100%, and the data is HN-GT200B-10dig-charg.csv, and the data jumps to 100% at 83%
    2. At a low temperature of 15°, charge defective products from 0% to 100%, and the data are HN-Gt200B-15dig-charg. csv and HN-Gt200b-15dig-charge-2.csv, and the data jumps from 92% to 100%
    (The log data of the laptop was interrupted during the 15° charging process, so there were two pieces of data, but the jump analysis results were not affected)
    3. It can be seen from the data that the closer to room temperature, the closer to 100% jump
    4. I need to apply for gg file and see if I can send it to you.

    HN-GT200B-10deg-charge.csvHN-GT200B-15deg-charge-2.csvHN-GT200B-15deg-charge.csv

  • 0 in reply to Gabriel Wang1
    TI__Guru** 105600 points

    Hello Gabriel,

    I took a look at the data, this is exactly what I mentioned in the previous post, CSYNC is used, VCT occurs which forces RemCap=FCC.

    If they don't want this behavior they should change the CSYNC bit. CEDV does not have the same accuracy, errors should be expected at different temperature ranges since FCC is not dynamically calculated like Impedance Track it is set based on the last cycle, if the last cycle was warmer and FCC updated the gauge expects there to be high FCC, but at cold temperatures the FCC is much less.

    Sincerely,

    Wyatt Keller