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BQ34Z100-G1: bq34z100-G1 question: should RUP_DIS be clear after applying a golden image?

Doug Baker
Genius 3420 points
Part Number: BQ34Z100-G1

I am using a bq34z100-G1 and I created a “golden image” / configuration for my battery that I load into the gas gauge.  After I load my configuration / golden image I can confirm it starts out with the impedance track disabled.


What I do is the following:

Step 1) flast the firmware in the bq34z100-G1 

Step 2) now load my settings into the bq34z100-G1 .

Step 3) verify RUP_DIS=0 and VOK=0

 

I am following the flowchart on page 54 of the Ref guide linked here after I configure the bq34z100-G1 for my battery by applying the golden image to the bq34z100-G1:

http://www.ti.com/lit/ug/sluubw5/sluubw5.pdf

The first part of the flowchart shows I should start out with the gas gauge showing RUP_DIS=0 but my device starts out with RUP_DIS=1.  I can confirm that VOK=0.

 

What settings should I check as to why after I first apply my settings / golden image I would start out with RUP_DIS set to “1” and not "0"?

 

Thanks,

Doug

  • 0
    TI__Mastermind 25955 points
    Hi Doug,

    Since you have been able to update from 0x04 to 0x05, the rest condition should be fulfilled with your settings and test setup. Please check the discharge rate and ensure it is C/10 or higher. Learning may fail the rate is less than C/10. Try a C/7 rate if the issue persists.

    Sincerely,
    Bryan Kahler
  • 0
    TI__Mastermind 25955 points
    RUP_DIS indicates that the Ra table updates are disabled. For the initial discharge, you want RUP_DIS = 1 so resistance updates do not occur. If IT is enabled, sending a reset to the gauge will cause RUP_DIS to assert (desirable for the initial discharge to empty).

    Once the battery is allowed to rest for 5 hours at empty, both RUP_DIS and VOK will clear when the guage has taken an OCV reading and qualified it for a Qmax update. If RUP_DIS doesn't clear,

    5 hours is a recommendation. With LFP cells, this may take longer, even up to 48 hours. Please ensure that LFP_RELAX is set in your gauge if using a LFP cell.

    Here is a presentation with some debug information with respect to the learning cycle: e2e.ti.com/.../4722.LearningCycleOverview_5F00_.pdf

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Genius 3420 points

    Thank you for the info!

    Doug