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BQ34Z100-R2: Use with a single Ni-MH cell

Angus Eason
Prodigy 20 points
Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ34Z100

Tool/software:

Hi There,

I need a fuel gauge IC for accurate SOC and health estimation for a single NiMH cell, 504-6219 from RS with a nominal voltage of 1.2V. Is the BQ34Z100-R2 adequate for this purpose? I can see that it does single cells but I was wondering if this is only applicable for Li-Ion, as the cell voltage for these is much higher at 3.6V. I will have a boost converter to provide a 3V3 rail to power the BQ34Z100-R2.Is there anything else I need to consider for my case to use the BQ34Z100-R2?

Thanks in advance :)

  • 0
    TI__Mastermind 25565 points

    Hello Angus,

    It seems that it could be possible but the biggest issue is that the system would need to stay power on indefinity in order for the battery gauge to monitor the cell. We don't recommend this system due to the voltage being used but I will reach out to the BQ34z100 expert to get his feedback. Please allow for some time due to him being on leave for vacation currently.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 20 points

    Hi Alan, thanks for the feedback. When is your collegue back from holiday? Also when you say "the system would need to stay power on" I am assuming you mean my boost converted 3V3 rail? 

  • 0 in reply to Angus Eason
    TI__Mastermind 25565 points

    Hello Angus,

    After discussing this topic among the team, this battery gauge setup is very problematic and has a lot of technical barriers to overcome. For this reason we are all heavily recommending not to do this setup and we can't foresee all the issues you would run into while upbringings this system. 

    Thank you,
    Alan