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FDC2214: EMI-Resistant Architecture of FDC2214.

Wenhan He
Prodigy 230 points
Part Number: FDC2214

Hello

1/ The datasheet said the FDC2214 is an EMI-Resistant Architecture, how does it imply this function? Please give me some explaniations in detail.

2/ The Vsensor should be limited in the range of 1.2v to 1.8V, but I still get the measurement results when the Vsensor>1.8V and <1.2V. So why should be Vsensor limited in this range? (If Vsensor <0.5V, I did not detect the capacitance variation).

Thank you very much.

  • 0
    TI__Expert 3435 points

    1. The input deglitch filter suppresses EMI and ringing above the sensor frequency. It does not impact the conversion result as long as its bandwidth is configured to be above the maximum sensor frequency. The input deglitch filter can be configured in MUX_CONFIG.DEGLITCH register field as shown in Table 11 of the datasheet

    2. The internal blocks that convert the oscillations into digital code doesn't work properly if the voltages are not in the specified range. FDC2214 works at its best performance when the voltage recommendations are followed.

    Regards

    Sharath.

  • 0 in reply to Sharath Vallamkonda
    Prodigy 230 points


    1.You mean, if the input deglitch filter is set to be greater than the maximum value of the resonance frequency, then the influence of the frequency above the input deglitch filter will be eliminated?

    2.I still don't understand, can you give a more detailed explanation.

  • 0 in reply to Wenhan He
    TI__Expert 3435 points

    1. Yes, your understanding is correct

    2. The device is designed considering Vsensor to be between1.2v to 1.8V. You might see readings even if it is slightly above or below, but best to be within these values for reliable data.

    Sharath.