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Using CC1310 Time to Digital Converter for Capacitive Proximity Sense

Sean Alm
Prodigy 50 points
Other Parts Discussed in Thread: CC1310, FDC1004

I am currently using the CC1310 in an application where I am also using a NXP PCF8883 for capacitive sensing input. I just realized the CC1310 has a Time to Digital Converter and I am wondering if anyone has used this in a capacitive sensing application? It should be possible with an onboard TDC but I'm worried it will be a very time consuming endeavour unless someone has already done it once before.

Thanks,

Sean

  • 0
    TI__Expert 8050 points

    Hi Sean,

    As far as our FDC is concerned, it can work with any MCU with I2C and GPIO.

    You should check the datasheet of the NXP part for its application requirements.

    Regards,

    Yibo

  • 0 in reply to Yibo Yu
    Prodigy 50 points

    Thanks for your response Yibo but I think we're a little misaligned. The point is to replace the PCF8883 part, not interface to it. I already have it working to where I can monitor the PCF8883 on a GPIO. I'm interested if anyone has used the TDC in a RC timing circuit that could compare a reference capacitor discharge time with a 'sense plate' capacitor discharge time. This way you would be able to detect changes in the RC time constant at the 'sense plate' capacitance. If I could do this with the CC1310 (and some passives) then I could remove the PCF8883.

  • 0 in reply to Sean Alm
    TI__Expert 8050 points
    Hi Sean,

    Thanks for the clarification. For that purpose, I would suggest posting the question on the forum for CC1310. This forum is for TI's capacitance-to-digital converters, FDC1004 and FDC221x.

    Regards,
    Yibo