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Gas gauge for 24V NiCd batteries -- BQ2014H

Madhu Vatte
Intellectual 835 points
Other Parts Discussed in Thread: BQ2014H, BQ34Z100, BQ34Z110, BQ2060A, BQ2014

Hello,

I am looking for gas gauge IC for 24V NiCd battery.  I saw bq2014H on the website but the maximum voltage on this part is 6.5V.  Is there any way I can use this for 24V.  I was also looking at bq34z100 which is the same case.  Are there any app notes on these so that they can be used for 24V?  Are there any other TI preferred IC's I am missing?

Thanks for your help!

Madhu.

  • 0
    TI__Intellectual 2120 points

    Both the bq2014H and bq34z100 can be used with 24V batteries. The voltages you mention are the voltage at the supply pin. The bq34z100 family is the best solution going forward and the EVM shows how to connect the device to a high voltage battery stack.

    Currently the bq34z100 only works for Li-Ion but the bq34z110 works with PbA and the soon to be released bq34z120 will support NiCd/NiMH cells using the same schematic and hardware.

    Best regards

    Garry

  • 0 in reply to Garry Elder
    Intellectual 835 points

    Hello Garry,

    Thank You!  I saw that on the datasheet for bq34z100 that the maximum voltage is 65V.  I was looking at so many datasheets (bq2060A, bq2014H, etc.) and also NiCd support, I somehow missed it.  Could you please tell me what is the maximum voltage supported by bq2014H?

    Do you know when bq34z120 part will be released?

    Thanks,

    Madhu.

  • 0 in reply to Madhu Vatte
    TI__Guru 73830 points

    Madhu

    The bq2014 and the bq34z100 use resistor divider networks to translate the full stack voltage to the input of the device. Neither of these devices will accept a direct 65V to a sense pin. The resistor divider network is covered in their datasheets.

    Regards

    Tom