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TI Home » TI E2E Community » Support Forums » Power Management » Battery Management » Battery Management - Gas Gauge Forum » Z-serial device Ra-table update range
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Z-serial device Ra-table update range

Z-serial device Ra-table update range

This question is not answered
M2
Posted by M2
on May 04 2009 09:29 AM
Intellectual430 points

Dear All:[:D]

Do you have datasheet of the rang of the Ra-table update during discharging?

Example: Increase 3 times limit; decrease 0.3 time limit;

Thanks a lot! [:D]

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  • Yevgen Barsukov
    Posted by Yevgen Barsukov
    on May 08 2009 15:31 PM
    Prodigy60 points

    Resistance updates happen at grid-point every 10% of discharge, and below 20% SOC about every 3.3% of discharge.

    At each grid point, limit for update is no more than 3 times change either up or down.

    It is also not allowed to become negative.

    If either limit is exceeded, R_DIS flag in Operation Status will be set and resistance updates

    are disabled until next relaxation will allow an OCV reading.

     

    This limits start after optimization cycle is finished and Update Status = 6 is shown.

    Resistance flags will change from FF55 to 0055.

    Before optimization cycle is complete, there is no limits. That is why it is important

    to perform optimization cycle starting with default values, so that no limits will interfere

    with learning.

     

    There is no limit for absolute value, except signed integer range 2^15.

     

    Regards,
    Yevgen

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  • M2
    Posted by M2
    on May 10 2009 08:55 AM
    Intellectual430 points

    Dear Yevgen:

    Thanks your providing information!

    Ra-table reduces limit is 3 times or 0.3 times? up is 3 times.

    Therefor, IT enable is very important while cell must in the relaxation mode.

    Coudl  you please tell me conditions of the R_DIS flag raise?

    Example:

    1. Ra-table update over 3 times.  

    The Second questions:

    • If IT enable while cell in active mode,how many parameter happen error?
    • And whether can recover normally? 

    Best Regards!

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