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BQ40Z50-R1: How to set the gas gauging ?

Sheng Huang
Prodigy 115 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: STRIKE, BQSTUDIO

Dear Sir or Madam:

           I  use the bq40z50-r1 in my  design ,I need to konw ,the "system resistance ",  the "pack resistance"and  the"Term voltage "is a  fixed vaule or a  changing vaule ?

          Once I  set these parameters ,will they change ?

          If they happen change ,what's  wrong ? I have sealed the bq40z50-R1 using the 0x0030.

         Looking forward to your replys .Thank you .

  • 0
    TI__Genius 14985 points
    Hi Sheng Huang,
    Term Voltage is a fixed value once you set it in dataflash.
    System Resistance and Pack Resistance are related to the Turbo Boost mode feature only. If you aren't using that feature then you don't need to worry about them. If you are using them then you should initialize them in your golden dataflash, but they can be changed even while sealed, using the 0x5B TURBO_PACK_R and 0x5C TURBO_SYS_R commands.
  • 0 in reply to dMax
    Prodigy 115 points

    Dear dMax :

             Thank you very much for your reply .

             In my application using the bq40z50-r1, I set the"Term voltage" to be a fixed vaule:6000mV,but it changed.

            The system resistance or pack resistance often changed.

            Also another  parameters:Min Turbo power changed. I set it 0 cW,but it changed to be "22795"or another large number .Why?

            Please help me analyze  this problem.Is there some  instructs to  strike the bq40z50-r1?

            Another question:can  I   first  use "0x0414",then"0x3672"  to unseal the bq40z50-r1?

            Can I forbidden the bq40z50-r1 to check the system resistance and pack resistance in the application?How to do this ?

             Thank you  again!

            

  • 0 in reply to Sheng Huang
    TI__Genius 14985 points
    Hi Sheng Huang,
    Pack and system resistance is set only once by the user, and should not change. It's odd that you see Term Voltage changing. Can you please share .gg.csv files from before and after that illustrate the change?
    Are you using the TurboMode feature?
    Yes, you send 0414 then 3672 to unseal, but you might need to swap the bytes depending on what tool you are using to write them: 14 04 then 72 36. Using bqStudio you can just click the Unseal command button on the right and it will send the default unseal key first. If it fails then it will ask you for your custom unseal key.
  • 0 in reply to dMax
    Prodigy 115 points

    Dear dMax:

            Thank you again.

            Can you give me your mailbox?I will send the gg.csv  file to your mailbox,because I can't upload this file successfully  using this tool.

             1803165.gg.rar

            

  • 0 in reply to dMax
    Prodigy 115 points
    Dear sir : I upload a gg.csvv file which is the normal one .Please help me analyze if it there is some problems. The changed one only the system resistance changed to a large number .
  • 0 in reply to dMax
    Prodigy 115 points

    Dear dMax:

          Please help me analayz the gg.csv file.I have uploaded it .

          Looking forward to your reply.Thank you .

  • 0 in reply to Sheng Huang
    TI__Intellectual 1365 points
    Hi Sheng Huang,
    I can't find the any abnormaility in your gg.csv file. Would you attach the gg.csv file from before and after that gives the change.
    As David mentioned, Gas Gaunging[Term Voltage],[Pack Resistance] and [System Resistance] can't be updated in Data Flash.