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BQ27542-G1: We Used above part in our system

Shubham patil
Intellectual 520 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: GPCCHEM, BQSTUDIO, BQ27742-G1

Hello ,

We are using above part in our system but this will not able to give proper reading.we connected above part in TI tool (Battery Management tool)

Used attached image for your reference.

 

We are discharging the battery but tool not able to detect that one .

We are using 12000MAh Battery .

Tool also not able to detect the battery capcity and other reading like charging.

  • 0
    Intellectual 505 points

    HI E2E Team,

    This is very critical issue. We would like to make this Fuel gauge working ASAP.

    Can you please suggest which all the parameters we need to set during the startup?

    Below are query from my side,
    1. Do we need to configure any parameter before fuel gauge chem id generation?
    2. For chem id generation temperature is to be of cell temperature or fuel gauge internal temperature, the current is to be average current or any other current value.
    3. The exact list of the parameter to be configured before the learning cycle, what each parameter means and what is the impact on learning cycle, let us know values for 12000mah and 3.7v(nominal) battery cell.
    4. In our case why full charge capacity always shows zero, what can be the possible RCA.
    5. What is the option to write chemid and learning cycle in case we don't do it on the production floor?
    6. is data memory volatile? what will happen to loaded chemid and learning cycle in case the battery is removed?
    7. What are the exact configuration parameters to be required to dump while initializing fuel gauge from firmware every reboot?
    8. what is the impact on soc and other sensing values id we do not seal the register access after configuration?
    9. How we can know that fuel gauge is in a relaxed state from power supply current and voltage reading?
    10. What are the parameters that are updated in data memory when we write the chem id using the tool?
    11. What are the parameters that are updated in data memory when we write the learning cycle using the tool?
    12. How much time does it take to generate chem id and learning cycle for 12000mah battery?

    Regards

    Saumil

  • 0 in reply to Saumil Shah60
    TI__Guru 52115 points

    I see most of your questions are related to Chem ID and Learning Cycle. 

    Take a look a the following two app notes

    http://www.ti.com/lit/an/slua903/slua903.pdf

    http://www.ti.com/jp/lit/an/slva725a/slva725a.pdf

  • 0 in reply to Andy Liu (BMS)
    Intellectual 505 points

    Hi Team,

    Based on your given information we have done the chemID generation and Learning cycle process 2-3 times as we are getting a failure to have the correct ID yet.

    Below are some queries-

    -We have seen one surprising behavior that when the battery is fully discharged at 3V level if we plugged the charger On for charging cycle then BQ studio is not able
    to detect the fuel gauge up to a certain battery voltage level. Once we plugged off the charger then BQ studio is detecting the Fuel gauge.

    - For running the Charging cycle with C/10, for our battery which is 12000mAh so we need to charge the battery with 120mA and which is consuming a lot of time. What max Charge current

    can we use to complete the Charge cycle fast?

    - Even if our Process of ChemID and Learning cycle is no completes correctly then also after how many charges and discharge cycles, the fuel gauge will automatically detect and work correctly based on

    the intelligent algorithm it has?

    - We are using a bq27542-g1 fuel gauge. We are writing the code for a flashing golden image. We were using a sample dfss file of bq277421-g1 for testing purposes. While flashing the image, we found that after switching to ROM mode, our device got stuck in the ROM Mode and is not able to exit from it. But still, we are not able to exit from it. We are stuck here and not able to do anything.

    Please let us know your feedback on this.

    Regards

    Saumil

     

  • 0 in reply to Saumil Shah60
    TI__Mastermind 24870 points

    Hello Saumil,

    1. Please attach your GPCCHEM report.

    2. For the learning cycle, please let us know which steps you went through on the collateral and where you are stuck.

  • 0 in reply to Kang Kang
    Intellectual 505 points

    Hi Team,

    I will share the GPCCHEM report in the next response as we are in the process of doing the discharge - relax cycle.

    Regarding the Learning cycle,

    Can you tell me whether the logs of BQstudio needed between 3V to 3.230V or not?

    Regards

    Saumil

  • 0 in reply to Saumil Shah60
    TI__Guru 52115 points

    Hi Saumil,

    For the learning cycle, the log file is more for debugging purposes.  What you need to focus on is to read the instructions carefully and make sure the important events can happen during each step.  If you get stuck in the middle and ask for help,  we normally request a log file so that we can check what happened during your learning cycle.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Intellectual 505 points

    Hi Andy,

    Ok, I got it.

    Now can you answer me on below queries first-

    1. ChemID generation seems to be a very lengthy process for 12000mAh battery. Why do we need to charge the battery with only C/10 as with 120mA, it took 100 hours to complete the charge cycle?

    2. Is it expected that BQstudio will not be able to connect in the charge cycle for Bat voltage increasing from 3V to 3.230V?

    3. Want to understand the behavior of Fuel gauge if we do not run the learning cycle? 

    4. Does this fuel gauge have intelligence that after having 2-3 charge and discharge cycles, it will automatically calibrate and start giving the correct data?

    Please share your inputs.

    Thanks

    Saumil

  • 0 in reply to Saumil Shah60
    TI__Guru 52115 points

    See my comments below.

    1. ChemID generation seems to be a very lengthy process for 12000mAh battery. Why do we need to charge the battery with only C/10 as with 120mA, it took 100 hours to complete the charge cycle?

    It will not take 100 hours if you discharge with C1/0 rate (1200mA). It normally will take a bit longer than 10 hours.

    2. Is it expected that BQstudio will not be able to connect in the charge cycle for Bat voltage increasing from 3V to 3.230V?

    No.  I think it might be a software issue.  As I mentioned before,  your focus is to read the instructions carefully and make sure the important events can happen during each step.

    3. Want to understand the behavior of Fuel gauge if we do not run the learning cycle? 

    You CANNOT expect an accurate state of charge reading if the learning cycle is NOT done.

    4. Does this fuel gauge have intelligence that after having 2-3 charge and discharge cycles, it will automatically calibrate and start giving the correct data?

    No.  The learning cycle is an important part of the gauge firmware. It must be done before the gauge device can report the correct SROC. 

  • 0 in reply to Andy Liu (BMS)
    Intellectual 505 points

    See my comments inline-

    1. ChemID generation seems to be a very lengthy process for 12000mAh battery. Why do we need to charge the battery with only C/10 as with 120mA, it took 100 hours to complete the charge cycle?

    It will not take 100 hours if you discharge with C1/0 rate (1200mA). It normally will take a bit longer than 10 hours.

    <Saumil> - I am talking about charging time for 12000mAh battery with C/100 rate.

    Can you explain why is it needed to be with C/100 rate for ChemID?

    Thanks

    Saumil

  • 0 in reply to Saumil Shah60
    TI__Mastermind 24870 points

    Hello Saumil,

    It needs to be a light load. I think C/10 is the recommendation and not C/100.

  • 0 in reply to Kang Kang
    Intellectual 505 points

    Hi Team,

    App note recommendation is C/100 but if C/10 is ok then we shall take care of it.

    One more Query-

    While setting up the parameters in the BQstudio, for 3.7V,12000mAh battery, we need to put 44400mWh in the design energy field.

    But when I am entering this value, it is showing beyond the limit error. Why?

    Thanks

    Saumil

  • 0 in reply to Saumil Shah60
    TI__Guru 52115 points

    Hi Saumil,

    You need to to se the Design Energy Scale = 10. 

    See Section 5.3.5.11 Design Energy Scale of BQ27742-G1 TRM.

    Andy