This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ26501: Single cell NiMH compatible coulomb counter

Part Number: BQ26501

Tool/software:

I asked a question on these forums around using a coulomb counter for SOC estimation of a single cell NiMH battery. I was told TI did not have any applicable products, and the thread was locked before I was able to ask any follow up questions, see here BQ26501: Single cell NiMH compatible coulomb counter - Power management forum - Power management - TI E2E support forums. I would like to ask why I cannot use a device such as the BQ26501, and provide it with a 3V3 rail from a boost converter? It would still be able to perform coulomb counting, from which I can estimate the loss/gain in SOC? Please can I have a better explanation as to why this would not work.

Kind Regards

  • Hello Angus,

    The battery gauge is powered directly from the cell and due to your cell being a very low voltage at 1.2V it would not be sufficient to power on a battery gauge reliability enough. If you wish to power a battery gauge with a 3v3 boost converter it will negatively impact the ability to accuracy gauge the state of charge, state of health for the gauge since it wasn't intended in being used in this matter. 

    Thank you,
    Alan