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BQ27742-G1: Difference between .bq.fs and .df.fs file

Thomas Treyer
Prodigy 240 points
Part Number: BQ27742-G1

I am using Battery Management Studio version 1.3.80 to configure a prototype battery pack, which includes a BQ24421-G1. I programmed a proper ChemId, I calibrated it and run a learning cycle successfully. I created a "Golden Image" and got 3 files:

  • myName.bq.fs (180 kByte)
  • myName.df.fs (7 kByte)
  • myName.srec (184 kByte)

Which file shall I use during production of our battery packs? Is it sufficient to use the small .df.fs file? Or do I need to program the larger bq.fs file?

I am asking because it takes a significant amount of time to transfer 180 kByte to our microcontroller. 7 kByte would be much faster. What is the difference between these files? Something is missing in the smaller file, but I do not understand what is missing.

  • 0
    TI__Guru* 76230 points
    Hi Thomas,
    You can use any one of the files. The srec and bqfs are the same contents just different formats. They contain the instruction flash ( firmware ) and dataflash.

    The dffs on the other hand contains just data flash and since you are not going from one firmware version to another, that is all you need to program the device for production purposes.

    thanks
    Onyx