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BQ27Z561-R2: Need clarification about final step before exporting GOLDEN image.

Part Number: BQ27Z561-R2

Tool/software:

Dear community,

I can achieve successful learning cycle of the fuel gauge but need some clarification about finals steps before exporting GOLDEN image. 

In the TI instructional video "How to perform a successful learning cycle with gauges" https://youtu.be/WAcxrGDb68g?si=oZ8xAjwe5rHxSR0z it does not instruct to make specific stapes that are mentioned in the "SLUA903–July 2018  Achieving The Successful Learning Cycle". Those steps are in the chapter "5 Conclusion" and are as follows":

Before saving the Golden File, set Update Status to 02 to disable IT gauging, set the Qmax Cycle
Count to 0, and set the Cycle Count to 0. For a pack side gauge, this ensures that when the pack is
assembled and gauging and lifetime data is enabled, the cycle counts start from 0.

After successful learning cycle Update Status is 0E and is decoded as follows

 



If I will change Update Status to 02 this means I will add these properties to my GOLDEN image:

1,0 = QMax updated, Ra updated

Gauging() command. 0 = Disabled

is_QMax_Field_Updated—QMax has updated in the field. 0 = Not updated

Since this final step is not mentioned in both sources natural question from me side is it critically important? If I will make Update Status 02 I understand I will need to enable Gauging before releasing battery to the market.  I lean my question more toward the "is_QMax_Field_Updated" flag. If I will change it to  0 = Not updated do I need to make sure that new battery will be fully discharger and fully charged for the first cycle in it life to properly update Qmax? What if client will not do this full cycle? 

  • Hello,

    The QMax Field flag is set to 0 before saving the Golden Image if and only if the learning cycle results in an Update Status value of 0E. If a value of 0x0E is not obtained after the final relax cycle, the device must be charged to full, relaxed for 2 hours and discharged to empty (Steps 3.2.3 - 3.2.5 in the learning cycle). At this point, the value of Update Status should be 0x0E, following which the customer can make the necessary changes to Update Status. Since gauging is enabled when the pack is assembled, we must ensure that the Qmax cycle count is set to 0 to properly monitor Qmax.

    Regards,

    Siddharth

  • Hello Siddharth, in my case Update Status value successfully reaches 0E during the learning cycle. So I must set QMax Field flag to 0 ? 

  • Hello,

    Yes, setting Update Status to 02 (0010) will set the Qmax Update field to 0.

    Regards,

    Siddharth