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As with the relaxation oscillator, when using capacitive sensing, the PCB trace acts as one plate of the capacitor. When a finger comes into proximity with the plate, it acts as the other plate and air is the dielectric. As the finger moves closer to the pad the capacitance changes based on the equation for capacitance as shown in an earlier slide. Keeping in mind that as the finger moves closer, the value for “d” is reduced which then increases the capacitance. Likewise, as seen in the previous slide, with the SAR operation as capacitance increases the comparison point for the threshold voltage decreases.
PTM Published on: 2012-05-16
