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BQ27Z558: OCVFR function & RSOC was fixed 0% issue

?? ??
Prodigy 30 points
Part Number: BQ27Z558

Tool/software:

Hi,

I'm observing a behavior where the voltage at which RSOC drops to 0% varies depending on the discharge current.

For example, sometimes RSOC reaches 0% at 3400 mV, while other times it drops at around 3100 mV. In particular, when RSOC reaches 0% at around 3400 mV, I noticed that the OCVFR flag becomes active.

After that, even if I begin charging with a constant current, RSOC does not update until the cell reaches full charge voltage. During this period, the OCVFR flag remains high.

I have two questions:

1. Is this behavior considered normal and expected from the gauge?
2. Could you please tell me the voltage range of the Flat Voltage Region (FlatVoltMin–FlatVoltMax) for the ChemID:1371 I am currently using?

Thank you in advance for your support.

  • 0
    TI__Mastermind 25225 points

    Hello,

    Can you send your .log file of when this event is going on, this is many possibilities that could be happening and a .log file would help debug the issue.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 30 points

    Hello Alan,

    Thank you for your response.

    Unfortunately, I did not capture a log file at the exact moment this issue occurred, so I will need to wait for the same condition to happen again in order to collect that specific log.

    In the meantime, I’ve attached a log file during normal operation for your reference. I would appreciate it if you could review it in case it provides any helpful information.

    Additionally, could you please let me know the Flat Voltage Region (FlatVoltMin–FlatVoltMax) for ChemID 1371?

    Thank you again for your support.OCVFR_test0414.logRC_issue_test0411.log

  • 0 in reply to ?? ??
    TI__Mastermind 25225 points

    Hello,

    I had a chance to review the current .log you've sent and it seemed to be normal operation and I will wait for the .log files with the sudden drop of RSOC. I've attached an FAQ that may help your situation aswell.

     [FAQ] Why does SOC drop from 100% after full charge?:
    https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1263625/faq-why-does-soc-drop-from-100-after-full-charge

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 30 points

    Hello Alan,

    Thank you again for taking the time to review the logs and for sharing the helpful FAQ.

    I’ve gone through the document and confirmed that the items mentioned there don’t apply in my case. I truly appreciate your continued support.

    To clarify, I’m currently just trying to confirm the Flat Voltage Region (FlatVoltMin–FlatVoltMax) for ChemID 1371.
    This is the only remaining point I’m hoping to understand at this stage. I may have asked this already, but I wanted to kindly check again in case it was overlooked or if it happens to be a difficult value to access.

    If there is any limitation in sharing this information, I would also appreciate your guidance.

    Thank you again for your help and kind attention.

  • 0 in reply to ?? ??
    TI__Mastermind 25225 points

    Hello,

    We are not allowed to give out the flat voltage region for chemID's, what you could do since the chemID is directly based on your cell you can reference your cell's datasheet to determine the flat voltage region.

    Thank you,
    Alan