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BQ41Z90EVM: BQ41Z90EVM_configuration

Ahmed MOSRATI
Prodigy 175 points
Part Number: BQ41Z90EVM
Other Parts Discussed in Thread: BQ41Z90, BQSTUDIO, GPCCHEM

Tool/software:

I am currently testing the "BMS081E1" "BQ7016EVM" evaluation board, which uses the BQ41Z90 .

My current setup uses a 10S4P Li-ion battery. However, I am facing some issues and need your help:

SOC always at 100%:

  • How can I fix this issue?
  • What is the best configuration to get an accurate SOC/SOH  reading? 

Short-circuit protection:

  • How do I configure the register for short-circuit protection?
  • The short-circuit discharge configuration register in BQSTUDIO differs from the reference manual. How can I effectively protect the ASCD?

FET ENABLE & FET OPTION:

  • The charge and discharge FETs do not activate automatically after a reset. How can I correct this configuration?

Best regards,

  • 0
    TI__Mastermind 25915 points

    Hi, 

    1)

    You need to get a Chemid match using the gpcchem tool and complete a learning cycle.

    2)

    I will have to look into this for you, please allow me sometime.

    3)

    Set FET_EN =1, this will allow the FW to control the FETs. 

    Then set the NR bit. 

    FET options = 0000

    Then as long as the protections are not violated the FETS will be on.

    Regards,

    Diego

  • 0 in reply to Diego
    Prodigy 175 points

    Hi Diego,

    Thank you for looking into this for me. I appreciate your assistance.

    I have a follow-up question regarding the design capacity configuration.

    Design Capacity Configuration:

    • My battery has 10 cells in series and 4 in parallel, with each cell having a capacity of 3030 mAh. This results in a total capacity of: Total Capacity=3030 mAh×4=12120 mAhTotal Capacity=3030 mAh×4=12120 mAh
    • When converting this to cWh (centiWatt-hours), the calculation is: 
      Capacity (cWh)=Total Capacity (mAh)×Voltage (V)/10 => Capacity (cWh) = 12120 mAh×36 V/10 = 43512 cWh
    • Since 43512 cWh exceeds the register maximum of 32765, I need to scale down the value.
    • How should I set the design capacity in this case? Should I use a scaling factor to fit within the register limits?

     For point 3), it's okay for activate the FET 

    Thank you for your assistance.

    Best regards,

  • 0 in reply to Ahmed MOSRATI
    TI__Mastermind 25915 points

    Hi,

    At the moment only voltage scaling is available, Please use the design capacity in mah.

    Regards,

    Diego