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FDC2214: reduce of measurement capacity value

Part Number: FDC2214

Hello,

I test FDC2214 for water level sensor.

I adjust parameter, and it is linear carve for water level VS capacitance.

Vertical is capacitance(pF) and horizontal is water level(cm)

But when I stay sensor, it is reduce measurement value passed time, do not stop it.

It is test in indoor.

How does it doing?

Is there person who became in such a state?

  • Hello,

    Make sure that you are using shielded inductors, and that the reference sensor and level sensors are exposed to the same environmental conditions (such as same temperature). Also, make sure that the fixed sensor capacitor is a C0G grade cap,

    Regards,

    ChrisO