• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 1052 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

bq40z50 - performing a chemistry learning cycle

Karl Schwabe
Prodigy 90 points
Other Parts Discussed in Thread: BQ40Z50, BQEVSW, BQSTUDIO

I have been going in circles for the last few days trying to configure the bq40z50 for my test application. I thought I had the correct battery chemistry, but I am getting a R_DIS flag during the learning cycle which according to SLUA597[http://www.ti.com/lit/an/slua597/slua597.pdf] indicates that I have an incorrect cell chemistry selected. I want to use the battery management chip with a LiPo battery and it seems that the default ChemID of 0x0100 is not correct.

I was hoping to perform a chemistry learning cycle (as is described for the bq20 and bq30 chips), but I the bqEVSW software doesn't recognise the BQ40Z50. It complains that it requires an .encr file.

Up until now I have been using bqStudio to configure the chip, but it does not have the facility to perform a chemistry learning cycle, hence why I tried using the older bqEVSW.

I am using an EV2300 to communicate with the bq40z50.

I have also attached the .srec file, if that may be helpful.


How do I perform a chemistry learning cycle for the bq40z50?

Thanks for the help.

tail2_srec.srec.zip

  • 0
    TI__Expert 3385 points

    Hi Karl,

    We have a tool called the Gauging Parameter Calculator (GPC) for determining your proper ChemID. It involves a basic test in which you charge a battery to completely full (C/100 rate), allow it to relax for 2 hours, discharge to empty (C/10 rate), and relax for 5 hours. Using this logged data along with a config file, our GPC tool will help you select a proper ChemID

    Please go to this link, where you will find more in depth instructions on this process (Step 1), and where you submit your zip file to get your ChemID via email (Step 2)

    Best,

    Justin