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About "IT enable" for bq34z100-g1

zehua hu
Intellectual 935 points

Hi,

I am confuse about the usage of IT ENABLE. Datasheet descibes that "this command is typically enabled at the last step of production after the system test is completed." 

1.what does "system test" mean?  Now I have been made update status to be 0x06 sucessfully  through learning cycle. I know that I should output .dffs file then,and modify update status to be 0x02 manually. Do I need to do anything else?

2.why should we modify update status to be 0x02 after a successful learning cycle?It means "disable Impedance Track algorithm",but why?

3.Throughtout the entire production process, when should we send IT ENABLE command , and when should we not? 

“8.3.1.2.15 IT ENABLE: 0x0021”
“Forces the fuel gauge to begin the Impedance Track algorithm, sets Bit 2 of UpdateStatus and causes the
[VOK] and [QEN] flags to be set in the CONTROL STATUS register. [VOK] is cleared if the voltages are not
suitable for a Qmax update. Once set, [QEN] cannot be cleared. This command is only available when the fuel
gauge is UNSEALED and is typically enabled at the last step of production after the system test is completed.”

Thank very much!

Beast regards~

 

  • 0
    TI__Guru 73830 points

    You should leave IT disabled until the pack has been configured and calibrated, because it will limit some flash updates. The system test will be any verification testing that you perform on a pack during production. You will complete the optimization cycle to learn Qmax and Ra table for your pack. You will then need to create a golden file to use to program production packs.

    • Export a gg file.
      • Set both Cycle Count parameters to 0.
      • Set Update Status to 02 to disable IT.
      • Save the file.
    • Import the default srec file.
    • Update the ChemID
    • Load the modified gg file.
    • Save the golden srec.

    You can then program the golden srec into new packs. Then calibrate, enable IT, and seal the pack. It will then be ready to ship.