• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 1052 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Capacitive sensors and temperature

Jed Martens
Prodigy 110 points
Other Parts Discussed in Thread: FDC1004, FDC2214, FDC2212, FDC2112

I am designing PCBs using capacitive sensing. What IC do you make for capacitive sencing that is least effected by temperature? Currently I tried using the FDC1004 and the temperature effected the chip to much that would require a temperature sensor and correction, I am trying to avoid this.

Thank you,

Jed Martens

  • 0
    TI__Genius 14270 points
    Hi Jed,

    The resonant sensing capacitive sensing devices (FDC2112/FDC2214/FDC2212/FDC2214) can be constructed with a lower tempco, although in general it is recommended to use a multi-sensor design with a reference channel.

    Regards,
    ChrisO
  • 0 in reply to Chris Oberhauser66
    Prodigy 110 points

    I am designing capacitive sensor that is used to detect two different mediums with the FDC1004. I tested the temperature effect and the reading moved due to temperature 87% of my range between the two mediums. Since this is a low cost design and the range is extremely small. I am would like to avoid a temp sensor reference. Looking at the data sheets on the chips you suggested. What am I looking for to indicate the effect of temperature on the capacitive chip?

  • 0 in reply to Jed Martens
    TI__Genius 14270 points
    Hi Jeb,

    The FDC1004 supports 4 channels; is it possible to add a reference channel to your design? In that way, you would be looking at shifts relative to the reference, and so the temperature effects can be mitigated.

    Regards,

    ChrisO