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BQ35100EVM-795: EOS value

Jonathan Navor
Genius 9475 points
Part Number: BQ35100EVM-795
Other Parts Discussed in Thread: BQ35100, , BQSTUDIO

Hi Team,

We need your help to check customer's inquiry about EOS mode for bq35100.

Customer's inquiry below:

I have a problem with bq35100EVM-795. i need to use it in EOS mode to measure how long will it take to discharge completely. I have followed step by step from this guide: www.ti.com/.../sluubh1c.pdf

As written, i am trying to use a bq35100EVM-795 in EOS mode to measure how long will a battery take to discharge completely I have followed all the steps in the guided attached, but i cannot understand how to read this EOS value.

In particular, i can see all my bit registers set as i would like, also the chemistry has been updated and i do not have any problem in accumulator mode, so it is not about hardware connections. I have left EOS data fields in data memory as default ones.

-------

Looking forward to your response. Thank you.

Best regards,

Jonathan

  • 0
    TI__Guru** 105760 points

    Hello Jonathan,

    Can they share the .gg file of their configuration? The EOS mode is designed to give an alert when the battery is near end of service. Sometimes you can get SOH data, which I think he is referring to, but sometimes it is not very reliable due to a very flat resistance table for some batteries and needs to be tested on their system.

    If they are looking for examples of the procedure for EOS mode there's some on the forum: e2e.ti.com/.../636077

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Genius 9475 points

    Hi Wyatt,

    Thank you for the response. Our customer's reply is shown below.

    Ok, thank you. I am searching for a method that lets me get an approximation (in terms of time) of the discharge of my LiSOCl2 battery. Maybe I did not understand what is written in the reference manual, but I thought that the EOS mode can give this result. Can you give me some hints about how to get this data?


    By the way, the .gg file i get from bqStudio is attached here1614.configuration.gg.csv

    Looking forward on your response. Thank you.

    Regards,

    Jonathan

  • 0 in reply to Jonathan Navor
    TI__Guru** 105760 points

    Hello Jonathan,

    This gauge doesn't have any information available for the remaining time like some of our other gauges that use impedance track. For this chemistry (LTC) the voltage is very flat so it's hard to estimate SOH with low power.

    The system should be tested using the EOS mode to see how accurately SOH is reported during discharge. The EOS mode alert should always signal, but SOH may not be reliable as stated in the TRM.

    What chemistry ID is being used? For this gauge the exact matching ID must be used for the battery.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Genius 9475 points

    Hi Wyatt, 

    Thank you for the response and support. Our customer confirmed that he have already found the solution to the problem.

    Best regards,

    Jonathan