3.3.3.6 DEF_TCH_DRIFT_RATE

When there is a touch, the signal value increases above the reference. But if such signal value does not increase beyond the threshold, then the rise in signal is not due to finger touch. Usually, such a scenario can happen when there is a change in environmental conditions like temperature or humidity. This deviation should be drifted out for proper touch operation.

When the signal value is greater than the reference, this value defines the rate at which the sensor reference value is adjusted towards the change in signal value. The Touch Drift Rate value is scaled by 200 ms. If the Touch Drift Rate is 10 , then the drift period is 10 x 200 ms = 2s . So, every two seconds, the reference value will be incremented by 1 until it is equal to the signal value.