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BQ40Z80EVM-020: BQ40Z80EVM-020, BQ25756EVM

Marco Moller
Prodigy 40 points
Part Number: BQ40Z80EVM-020
Other Parts Discussed in Thread: BQ25756EVM, , BQ25756

Tool/software:

FG_GHG_LOG_REG_with_Errors.zip
Hi,

I am using the BQ40Z80EVM-020 with the BQ25756EVM to charge a 6-cell battery with the end goal to get the chemistry ID for the battery. However, while charging I have been getting a spike in the current and charging voltage during the taper charge, when this happens the inductor (I assume) also starts hissing the rest of the taper. I have uploaded the registers and .srec for the charger and fuel gauge respectfully with the log from the fuel gauge, the log was also plotted as seen in the figure. What can be the cause and how can I fix it?

Also the termination current on both the charger and the fuel gauge is set to 250mA but it can be seen that it goes much lower and never terminates even when the FC bit is set.

Thank you in advance for any assistance.

Kind Regards

Marco

  • 0
    TI__Mastermind 27340 points

    Hi Marco,

    I believe this jump in the current during the taper is an issue with the charger, please post another E2E thread with the BQ25756 with the main title of the thread so the charger team take a look into this. If there are other issues with the gauge, please post them here.

    Regards,

    Anthony

  • 0 in reply to Anthony
    Prodigy 40 points

    Hi Anthony,

    Thank you for the reply I have posted it under a new thread. And would the termination current limit set or the Full Charge (FC) condition not stop the charging on the fuel gauge side because it charges past both of these conditions.

    Kind Regards
    Marco

  • +1 in reply to Marco Moller
    TI__Mastermind 27340 points

    Hi Marco,

    The TC bit and FC bit are Flags and will not cause the gauge to close the CHG FET to stop charging. These are supposed to be checked by the host to let the charger know when to stop charging.

    Regards,

    Anthony