AN957 Datasheet, PDF (18/25 Pages) List of Unclassifed Manufacturers – Measuring HEXFETCharacteristics

AN957: TouchXpress™ Configuration and Profiling Guide
Configuration Tips
3.3 Moisture Immunity Optimization
Slight configuration tweaks can ensure a configuration profile that is optimally immune against water droplets or standing water on a
sensor. Setting active thresholds as high as 80% and active thresholds at 60% or 70% the maximum touched value will help to guard
against the small touch deltas that can accumulate on a sensor due to water droplets. The baselining system in the chip will eventually
rise to swallow those small deltas, but higher thresholds guard against temporary false positive touch events.
The system can be optimized further by enabling touch time-outs. Touch time-outs will cause the baselining algorithm to update more
aggressively, adjusting to compensate for positive delta effects caused by water droplets.
Figure 3.1. Guarding a Capacitive Sense System Against Moisture
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