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BQ76952EVM: Understanding the difference between BQStudio Export->Export and Export->Defaults

Harry McNally
Intellectual 440 points
Part Number: BQ76952EVM
Other Parts Discussed in Thread: BQ76952, BQ76942, BQSTUDIO

I found an error in slua991a.pdf "Easy Configuration of BQ76942, BQ76952 Battery Monitors", "3 GG File Example", Page 11.

The instruction is to select Export->Export Defaults but the GG file listed below is in the form of an Export->Export command.

I used Export->Export, edited, and Import->Import from a file worked without issue. I don't know if the pdf document or the behaviour of BQStudio selections is "reversed" I suspect the document.

But it raised the question of what to use when I am Importing gg files during development. I want to adjust settings and reload the gg after each reset or power cycle rather than use the OTP which I am warned has limited cycles. Aside question, does limited mean it can only blow fuse bits or that it is EE with limited erasures ?

So my main question is, should I be progressively exporting/importing Export Default files or just the Export files as I do development ?

If I use the simpler Export files, what could I change that will be lost (not re-imported) if I am not using Export Default files ?

If this is already documented, I apologise, the learning hill is still a steep climb atm :-)

All the best
Harry

  • 0
    TI__Prodigy 720 points

    Hi Harry,

    Thank you for catching that. You are right that the instructions and provided example don't match. I will see if we can get that updated.

    To address your main question, when you are doing development and changing settings you should use Export->Export and Import->Import From File. Additionally, the default file only includes extra metadata on the settings that are not necessary to upload to the device (i.e. Data Type, address offset, default value, etc.). The 'simpler' file holds all the parameters and values just like the default file so all of the parameters will be re-imported into the device with nothing lost. 

    For your side question, yes OTP has limited cycles which means you can only use OTP a few times. The OTP details are confusing and is not recommended to use while you're in development and testing. But, more information can be found in the BQ76952 Technical Reference Manual Section 3.2 Configurations Using OTP or Registers here: https://www.ti.com/product/BQ76952. 

    Hope this helped.

    Best,

    Andrew

  • +1 in reply to Andrew Han
    Intellectual 440 points

    Thank you Andrew

    And I will read the Tech Ref tomorrow (my time).

    All the best
    Harry