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FDC1004EVM: FDC1004EVM

Part Number: FDC1004EVM


Good evening:

I am trying to reproduce the results described in  the Application Report SNOA925 for the FDC1004EVM

As a first step I am making sure I understand the level calculation and its correction.

Using the data in Table 3,  OOP Approach Experimental Results, I am able to calculate the level shown for the "Baseline'Results and my result agree with the table.

What I do not understand is how to apply the "first order linear correction algorithm applied with a gain and offset setting of 1.23 and -0.6" described in Section 4.3.1 of the report. Is this correction applied to the level calculation, to the Level Meas capacitance or to both the Level Capacitance and to the Reference Capacitance. Could you please help me with an explicit calculation/formula for applying this correction and provide a table of your calculated results using the Baseline results from Table 3. There is no table in the Application Report listing the corrected calculated values.

  • Hello Ronald,

    This correction is applied to the level calculation. You can see the formula in section 1.1. In section 4.3.1, the formula is used with a gain of 1.23 and an offset of -0.6. The values used in the calculation are the level measurements from Table two with the Hand Distance at "Touch." Using the formula above yielded the following results, which matches the graph in section 4.3.1

    expected level calculated level corrected level
    0
    1 1.3701 1.085223
    3 3.1471 3.270933
    5 4.8438 5.357874
    10 8.7792 10.198416

    Best Regards,