• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 238 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

FDC2212: Can this sensor be used for material moisture measurement

Johannes Steinbock
Prodigy 10 points
Part Number: FDC2212
Other Parts Discussed in Thread: FDC1004

Hi,

we would like to perform a capacitive material moisture measurement on a new product.

After some research, I came across the FDC2212.

Now I would like to know if this would be suitable for this measurement.
The measuring range is about 0pF to 100pF.

The setup would look like this:

Would that work?

  • 0
    TI__Mastermind 40295 points

    Johannes,

    We have no experience using a capacitive sensor to measure moisture, so we can't provide any feedback on the approach.
    If it is something you would still like to pursue, please consider using the FDC1004. 
    Designs based on the FDC2xxx family of parts have faced challenges getting to production because of their sensitivity to EMI.
    The FDC1004 has built-in active shield drivers which help manage EMI. The FDC2xxx devices don't have this.

    You can find more info in the FDC1004 product folder and in the FDC1004 Capacitive Sensing FAQs.
    The FDC1004 has a nominal measurement range of ±15pF which can be extended to 115pF by using the internal CAPDAC setting.
    The active shields minimize EMI effects without detracting from the capacitive sensors, which isn't possible with grounded shields.

    Our humidity-sensors might offer a practical solution, depending on your requirements.
    If these look helpful, and you have questions, please submit another inquiry to this forum.

    Regards,
    John

  • 0 in reply to John Miller - Sensing
    Prodigy 10 points

    John,

    thank you for your answer.

    We will still try the moisture measurement with the FDC2212 and see what results we get.