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Original question:

BQ76920: Monitoring and Gauging of 4S pack during test flights of RC plane.

BQ40Z80: Necessity of EV2400 and bqStudio when programming/configuring/calibrating bq40z80 gas gauge?

Joseph Landell
Prodigy 190 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: BQSTUDIO, EV2400,

We are designing a battery monitor to report on SOC and remaining time of discharge for 6S LiPo packs.

Our device will send its battery info over SMBus to an MCU, which will convert the SMBus signal to CAN, and send it to a central CAN bus.

We would like to avoid using an EV2400 if possible, but do like the looks of bqStudio. Is it possible to have an STM32 MCU chip recognized by bqStudio? 

I have seen the bq40z80 Manufacture, Production, and Calibration document that outlines how to calibrate without bqStudio, but do we need bqStudio for other aspects of configuration? 

I am thinking that ChemID might be something bqStudio would be helpful for.

Essentially, is the EV2400 or bqStudio mandatory for developing a device with the bq40z80? And, is the EV2400 (or EV2300) required to use bqStudio?

Thank you for your help,
Joseph

  • 0
    TI__Mastermind 42535 points

    Hi Joseph,

    Yes, you will need to use bqstudio with an ev2400 at least once in your product design cycle. However, once you have completed learning the gauge, you can program it in production with your uc.

  • 0 in reply to Batt
    Prodigy 190 points

    Thank you for the quick reply! I was expecting that answer, but I am still a bit foggy with the second part.

    How would I transfer the profile of my device, after learning the gauge's configuration, to an unconfigured device? This is doable without bqStudio?

    Is there documentation describing this process?

    Thanks again!!

  • 0 in reply to Joseph Landell
    TI__Mastermind 42535 points

    Hi Joseph,

    You can put the device in fw upgrade mode and then export the srec with the learned data from bqstudio. Once that is done, you can use the same srec with other devices once you put them in fw upgrade mode and write the srec using your own SMBUS master uc.