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BQ28Z610-R1: how to choose load mode

Ran Zhang
Prodigy 230 points
Part Number: BQ28Z610-R1
Other Parts Discussed in Thread: GPCRB, BQSTUDIO

Hello,

We have 2S pack which use BQ28Z610-R1,the actual discharge current is as below figure,how to choose the load mode to avoid SOC Jump?

We had set load mode=0,load select=1  but SOC JUMP 21% to 0%.

  • 0
    TI__Guru 57697 points

    Hello Ran,

    A load select value of 7 will give better results. If you want the battery to handle a  -1400mA load at 1% you can set load select to 6 and program the user rate to -1400mA. Setting this higher load will result in longer run time at 0% with lower loads.

  • 0 in reply to Shirish
    Prodigy 230 points

    If I change the setting load select to 6 and program the user rate to -1400mA,Does golden learning need to run again?

    And will FCC be less than load select to 1?

    How to choose the discharge current used in GPCRB tool?

  • 0 in reply to Ran Zhang
    TI__Mastermind 27321 points

    Hello Ran,

    Any changes you make in the configuration/ data memory for best tuning the gauge, requires to export golden image again. Otherwise, you will have to manually apply the same configuration on each gauge at production level.

    Ran Zhang said:
    And will FCC be less than load select to 1?

    Yes and no, please let me explain. The goal of the load mode/select is to prolong run time in RSOC, RM, FCC, etc. Selecting load select is a trial error, and this is application dependent. This will require several tries until you find which load select is the most accurate and gives you the best performance (FCC, RSOC, RM, etc).

    Ran Zhang said:
    How to choose the discharge current used in GPCRB tool?

    You can use the rate you will be applying in your application, but make sure that the discharge current is constant. Also, please make sure to always charge at room temperature. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 230 points

    Could TI add some algorithm to avoid SOC JUMP? because if we make some changes in the configuration/ data memory for best tuning the gauge, requires to export golden image again,and always there is no use for the change.we have no more time to tune it ,our project is very emergency.

  • 0 in reply to Ran Zhang
    TI__Mastermind 27321 points

    Hello Ran,

    You do not have to export the golden image every time you configure the gauge. You only export the golden image once you know the gauge is providing the best performance.

    Are you using our EVM and our software bqStudio? If so, you can easily interact with the data memory parameters and change them as you test the gauge on your application.

    Regards,
    Jose Couso