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FDC2212: Changed the resonant frequency around 30 degrees

Part Number: FDC2212

Hello,

My customer have some questions about FDC221x.

[Q1]

They measured the temperature variation of the inductance and capacitance in their board for the following conditions.

(a) only their board

(b) their board with parallel capacitor

(c) their board with parallel inductor

(d) their board with FDC2212.

It changed around 30 degrees with FDC2212.

Does FDC221x have the cause that the resonant frequency turns into around 30 degrees?

[Q2]

They want to sense the liquid level by using FDC221x.

They are going to use a ratiometric measurement.

Would you review their sensor ?

I want to communicate with offline.

Best Regards,

Hiroshi Katsunaga