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FDC2214; how to make the approaching sensor system by this device

Takao Yamamoto
Genius 4135 points
Other Parts Discussed in Thread: FDC2214EVM

Dear all,

Could you advice me how to set passive device and register to materialize following system?

*If my idea is fundamentally wrong, please correct it.

**If my information is not enough, please teach me what information should I provide.

I think that I set resonant frequency to be 1 MHz at nothing condition.

And I want to set dynamic range to be 500 kHz ~1.2MHz.

In addition, I want to set resolution as small as possible.

I am using FDC2214EVM now, and I will make it like above based on EVM.

Best regards,

  • 0
    TI__Expert 8050 points
    Hello Yamamoto-san,

    The resonant frequency is set by the external L and C. To get 1 MHz, you can adjust either L or C to tune the frequency. However, if you make C much larger, it will have a negative impact on your resolution.

    To achieve the best resolution, you should use the max value of the ref_count, which is also the default value.

    Regards,
    Yibo