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BQ27441EVM-G1A: Evaluation Board

Pushpendra Singh
Prodigy 70 points
Part Number: BQ27441EVM-G1A

Tool/software:

Hello!
I am using the BQ27441EVM-G1A evaluation board to run some tests on the fuel gauge and how it is reacting to different charge currents. My operation has come to a pause where I could use some help. I am connecting a 4.2V rated battery to the BATTERY + and BATTERY - terminal block on the evaluation board. Here is a snippet of what I am seeing on the Battery Management Studio. 

If you look on the LHS, you can see the BMS reporting the battery voltage and battery charge percentage. But the register section which says that it is READ ONLY, has the full charge capacity at 1197mV. Since it is read only, I am not able to change it on BMS for the actual full charge capacity of the battery pack that I am using. How is the BMS telling me the battery % if that is not set by me? I want it to be changed to 4200mV and somehow can't do it. Can someone please advise? Thank you!

  • 0
    TI__Mastermind 29071 points

    Hello,

    You need to complete the learning cycle first before looking at registers like Full Charge Capacity or Qmax. https://www.tij.co.jp/jp/lit/an/slua903/slua903.pdf

    After completing the learning cycle, the gauge will update Full Charge Capacity automatically. 

    Regards,

    Adrian

  • 0 in reply to Adrian
    Prodigy 70 points

    Hi Adrian!
    Thank you for the response.

    Here is what I am currently at: 

    Here are my connections as of now:

    I have only connected the battery pack to the BATTERY + and BATTERY - terminal block. Do I also need to connect a load on the CHARGE+ and CHARGE- terminal block? My current battery voltage level is 3.8V approximately as you can see in the first screenshot. How will the battery pack get discharged for the BMS to understand the battery chemistry? Should I go ahead and install a 15W 1 ohm resistor as a load on the load terminal block to discharge the battery faster to 3000mV? Please advise.

  • 0 in reply to Pushpendra Singh
    TI__Mastermind 29071 points

    Hello,

    Yes, you should connect a load to the CHARGE+ and CHARGE-. You can connect a Keithley or any power source that is able to charge and discharge the battery.

    Regards,

    Adrian