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Original question:

BQ27742-G1: Urgent, please verify my chem id for battery 3.7V for learning cycle in fuel gauge evm module

BQ27742-G1: query related fuel gauge chem id updation

Reena Patel
Intellectual 375 points
Part Number: BQ27742-G1
Other Parts Discussed in Thread: BQSTUDIO

Hello onyx sir,

A very big thanks to you sir. I am working on project related fuel gauge. and as i have already told you that i had made simple i2c program to get soc value and voltage in discharge mode, but soc did not change with voltage value. and you suggest me to update chem id and other procedure for fuel gauge. So until now, i have done rel-dis-rel cycle for chem id and i got 353 as my chem id form GPC_chem_report and i update that value for my fuel gauge (BQ27742) and have done also calibration too.

Then i tried to get soc and voltage value through again my old i2c code (communicate with stm32l053) . And result was awesome. SOC value start to change in discharge mode. that means new chem id work in fuel gauge for my battery(Tenergy 3.7v 1400mAh). so my first question is do i still need to go through process of learning cycle for my fuel gauge ?? 


I am working in one company, and for now company has requirement of 1000qty fuel gauge (BQ27742-G1) for project. So can we get all fuel gauge with new chem id : 353 as default inbuit from TI ??  

If not, how can i update chem id in all fuel gauge without using BQstudio and EVM2400 ? Give me all ways to do for that. Do i need to use code for update chem id and if yes for code, how??  

Thanking you

Reena Patel

  • 0
    TI__Mastermind 24870 points
    Please refer to the EVM user's guide. bqStudio has a chemistry plug-in where you can perform this update.
  • 0 in reply to Kang Kang
    Intellectual 375 points
    Maybe you have confusion. I know how to update chem id using BQstudio and i already read EVM user's guide. My question is not about how to update chem id. Question is about can i get bunch of fuel gauge (i want around 1000 fuel gauge - BQ27742-g1) with inbuilt chem id 353 from TI compony ?? because if this is possible i will not need to update by myself. and if not possible then is there any way to update chem id without using of BQstudio.

    Thanking you
    Regards
    Reena patel
  • 0 in reply to Reena Patel
    TI__Mastermind 24870 points

    Hello Reena,

    I see, just go to Golden Image, export srec, bq.fs, or df.fs.

    It contains the image for which can be loaded to your MCU and the MCU just parses these files (df.fs for example) to update the data flash memory contents.

    Thanks

  • 0 in reply to Kang Kang
    Intellectual 375 points
    Hello sir,

    So, i am not able to get new fuel gauge(BQ27742-G1) with new chem id : 353. And as you have told me i create golden file. but i am confused now about how can i upload that in micro-controller (I am using stm32L053 in project) ??
    can you please guide me how can i attach this golden file with my main program code??
    and please suggest me do i need to go through learning cycle process for fuel gauge. because i see better result in fuel gauge after i update chem id but still it is not accurate.
    For my project i need my battery has to be terminate at 3600mV (it should indicate soc 0% at 3600mV) and i am doing that by setting my terminate voltage to 3600mV. is this the way i can terminate ?

    Thanks
    Regards,
    Reena Patel
  • 0 in reply to Reena Patel
    TI__Mastermind 42535 points
    Hi Reena,

    For going to production please refer to www.ti.com/.../slua449f.pdf and to the thread here, e2e.ti.com/.../2797509

    As far as Term V goes, yes, at Term V your gauge will report an RSOC of 0%. You will need to do a learning cycle as suggested in another post where I replied to you.