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bq20z80v102 DFF flag failure on several devices after loading dfi file from bqEASY

Jonathan West
Prodigy 40 points
Other Parts Discussed in Thread: BQ20Z80

I just built a 4cell LiPo battery pack around a bq20z80v102 chip. I connected to it using the EVM2300, software 0.9.79.  It all seemed to work until I started the bqEasy process. I chose the 1.02 version (default) dfi file and loaded it.  Everything continued until it tried to write to flash and then it complained that permanent flags were set so it could not continue.

I went back to the SBS screen and the DFF flag was set (it was not previously).  I tried the PF reset command (which worked previously) and it has no effect.  The device still responds to some commands and lights the gauge LEDs but it will not turn on the CHG or DSG fets and is basically useless.  I looked through these forums and found no good answer to the DFF flag except that it indicates an incorrect dfi file, but I used the only dfi file there is for v1.02

So I wired my battery cells to the eval board and tried to use it.  It went through the bqEASY process all the way to the cycles.  I got it to turn on the CHG fets and let the battery charge, but then I noticed that it has a bq20z80A chip which I believe means it is v110. 

Since I already have v102 parts I wanted to make sure that my the problem was not on my board so I replaced the v110 on the eval board with a v102.  It did the same thing as my board. It worked, I could read and write from the program.  but then I started the bqEASY process and as soon as I loaded the dfi file, the same thing happened and now it has a DFF flag set that I cannot clear and I can't charge or discharge it.

I ordered new bq20z80A parts and will try replacing them on my board to see if it will work, but it seems that there is a problem with your software or your bq20z80_1_02.dfi file.

Thanks,

Jonathan

  • 0
    TI__Guru 73830 points

    Jonathan

    The default dfi file must not be right in the archive. You should select the Use Internal dfi option.

    Regards
    Tom

  • 0 in reply to ThomasCosby
    Prodigy 40 points

    Tom,

    Thanks for responding.  Is there an alternative dfi file that I can load into the devices that have the DFF flags set or must I scrap them?

    Jonathan

  • 0 in reply to Jonathan West
    TI__Guru 73830 points

    Jonathan,

    The PF key should clear the DFF flag. Maybe the key has been changed or corrupted. Read SMB Command 62 to check the PF Key. If that key does not work, then the device is probably not recoverable.

    Regards

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 40 points

    Tom,

    I read the PF key and it was the same as before : 0x26731712  That code used to work, now it does not.  Guess I will swap that part.

    Is it correct to assume that I should not use any of the provided dfi files?  If this is the case, they should be removed from the software package, I have wasted the entire weekend, damaged one PCB and thrown away 3 devices due to this issue.

    Jonathan

  • 0 in reply to Jonathan West
    Prodigy 40 points

    Tom,

    I just finished swapping the part and this time I skipped the dfi file download.  This time it finished the process and now I am cycling the battery.

    Please have someone recreate those dfi files and replace them.  They are clearly not compatible with the devices.

    Thank you for your help.

    Jonathan