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BQ78350-R1: BQ78350- BQstudio PEstatus Issue

Adesh Jagtap98
Prodigy 210 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ78350, BQSTUDIO,

Hello,

I am working on the BQ78350 -BQ76920 EVM. In BQstudio, I am not able to see the cell voltages in PE status section. Whereas I am able to see the cell voltages in the register section. I am also not able to change my settings in PSstatus section. I am attaching the screen shot of the BQstudio. I am new at this BQ studio. Please help and guide to me in proper direction.

  • 0
    Mastermind 8415 points
    Hi Adesh,
    This needs to be confirmed but from what I recall, the device voltages in the PF section are the recorded cell voltages when a permanent failure occurred. This is used to help find out what happened when the system detected a permanent failure.
    So until you have a permanent failure, these voltages will always be 0.
    Regards,
    Michel
  • 0 in reply to Michel Solecki
    Prodigy 210 points
    Hello Michel,
    But there is section in which there are registers Which indicate the status of AFE.
    My issue is basically being not able to check cell balancing properly. I can't see which cell is in cell balancing mode. If I could see these AFE resisters, I can check which bits are high in CELLBALx registers.
    Regards,
    Adesh
  • 0 in reply to Adesh Jagtap98
    Prodigy 210 points
    Hi Michel,
    Yes , these are PF data flash snapshot so I won't be able to see them till there is no PF.
    But is there any other way to see what is happening in AFE registers?
    Regards,
    Adesh
  • 0 in reply to Adesh Jagtap98
    Mastermind 8415 points
    HI Adesh,

    I don't know if there is some clean GUI interface (in BQ Studio) that will allow you to see the cell balancing status. However, you can read the current cell balancing status through the BQ78350 commands.

    The AFE data is available by using the Manufacturing Access commands (SMBus), more specifically 0x0059 AFEConfig.
    You can access those in BQ Studio by clicking the Advanced Comm SMB button at the top.

    It's been a long time since I used BQ Studio, so I won't be of much help for this step. But look through the TRM about SMBus communication.
    Just remember that the SMBus protocol uses little-endian format (ie when you send 0x0059, you actually have to send 0x59 and then 0x00).

    Regards,
    Michel
  • 0 in reply to Michel Solecki
    Prodigy 210 points
    Okay. I will try to access this through SMB communication.
    Thanks a lot, Michel.

    Regards,
    Adesh
  • 0 in reply to Adesh Jagtap98
    Mastermind 8415 points

    I found this thread which might help you fetch the data:

    In short, put 0x44 in both Read and Write boxes. This is used for Manufacturer Access commands.

    In the big box next to Write, write 59 00.

    Press Write. Then press Read.The Read box should have the data that you are looking for. You will have to filter through the bytes to figure out which bytes correspond to your cell balancing status.

    Regards,

    Michel

  • 0 in reply to Michel Solecki
    Prodigy 210 points
    Hey,
    It is working.
    Thanks Man.

    Regards,
    Adesh
  • 0 in reply to Adesh Jagtap98
    Prodigy 210 points
    Hello Michel,
    I have started working in Gauging the battery pack. I have my 5S1P battery pack, I have tested it for temperatures and got the parameters needed for CEDV algorithm. I programmed those into the BQ78350-r1. Now what is next process to do? When will it be showing accurate FCC, RSOC and Absolute SOC. Is it needed to do some charge discharge cycles to get those parameters updated?

    Regards,
    Adesh
  • 0 in reply to Adesh Jagtap98
    Mastermind 8415 points
    Hi Adesh,

    Yes. the BQ78350 needs to do learning (charge/discharge cycles) to obtain the proper FCC and SOC values.

    Regards,
    Michel