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BQ27520-G4: The Ra-Table has no update after learning cycle

Cage Chen21
Intellectual 365 points
Part Number: BQ27520-G4

I did a lot learning cycle the ba27520 has not seem the Ra-table update, Qmax was update and update status update to 1 from 0 when I summited IT Enable command.

please help to check what wrong with my learning cycle process or my setting.

Attached file are gauge export file after learning cycle. chemID is #1783
Test process
1. Enable I.T. by EVSW command
2. Reset gauge by EVSW command

3. Discharge the pack by 260mA until cell voltage reaches 3.0V
4. Rest for 6 hrs.
5. Charge the pack by 4.2V 1.275A until charging current less than 26mA
6. Rest for 3 hrs.
7. Repeat step 3~6 for 4 cycles.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/KI2-Golden-sample-with-PCBA_5F00_20180808.7z

  • 0
    TI__Guru* 76230 points
    Hi Cage,
    I would implore you to go through this document.

    www.ti.com/.../slua902

    What is the capacity of your cell.? how did you identify your chem id? Make sure your discharge rate is in between c/5 and c/10- Not the upper and lower limits.

    Is your cell a 4.2V cell or 4.35V cell?

    thanks
    Onuy
  • 0 in reply to Onyx Ahiakwo
    Intellectual 365 points

    Hi Onuy

    Please refer below replies as mark <Cage>

    What is the capacity of your cell.?

    <Cage> 2600mAh

    how did you identify your chem id?

    <Cage> By GPC report, please refer attached file.KI1_1_Matching-report.zip

    Make sure your discharge rate is in between c/5 and c/10- Not the upper and lower limits.

    <Cage> Sure, 260mA discharge current is c/5 rate.

    Cage Chen

  • 0 in reply to Cage Chen21
    TI__Guru* 76230 points
    Hi Cage,
    c/5 is the upper limit. I mentioned it should be a value in between c/5 and c/10. Pls use c/7. Pls review the document i attached

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Intellectual 365 points

    Hi Onyx

         OK, I will re-do the learning cycle with C/8 discharge-rate, let's see whether Ra-table update.

    One more question, how do I confirm the learning cycle success for bq27520-Q4? which data will be updated? what number will be updated?

    Dose below data will be update when learning cycle finish?

    IT Enable

    App Status

    Update Status 0/update Status 1

    Update status (Subclass ID 83 and 84 Offset 4)

    Defx Ra/Packx Ra/x status (Subclass ID 87/88/91/92/93/94 and 84 Offset 0)

    Defx Ra/Packx Ra/x flag (Subclass ID 87/88/91/92/93/94 and 84 Offset 1)

    Defx Ra/Packx Ra/x  Base R (Subclass ID 87/88/91/92/93/94 and 84 Offset 2)

    Defx Ra/Packx Ra/x  Gain (Subclass ID 87/88/91/92/93/94 and 84 Offset 4)

    Cage Chen

  • 0 in reply to Cage Chen21
    TI__Guru* 76230 points
    Hi Gauge.
    pls read app note slua902. It addresses all you need to know about the learning cycle.
    thanks
    Onyx