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In the presence of larger series resistors between the device pin and the capacitive sensor, it is necessary to also adjust the ramp time for the CS0 conversion. This is done by using CS0IA to modify the source current used to charge up the capacitive sensor. If this source current and the series impedance are both high, the CS0 module will detect less of the capacitor on the other side of the impedance. Reducing the current allows the pin voltage to more directly reflect the voltage at the capacitive sensor. Determining the appropriate setting for CS0RP is one of the last in a series of related adjustments to be made for high-resistance loads. It requires that the adjustments for gain (CS0CG), output current (CS0IA), and the reset timing (CS0DT and CS0DR) have already been made. The adjustment values determined for those settings should be programmed into the CS0 module when performing the CS0RP adjustment.
PTM Published on: 2012-05-16
