Maximum allowed noise in CapSense

Question: What is the maximum value of noise allowed in a CapSense application?



Noise in the raw counts depends on many factors including board layout, external components, and external environmental noise. It is difficult to predict what would be the peak-peak noise in a system without actually monitoring it.

Noise in the system should be limited to below 50 counts to achieve a 5:1 SNR (5:1 SNR is the minimum requirement for any CapSense design). If a noise count is greater than 50 filtering techniques or layout changes need to be made.

Note: A properly designed system will have noise counts less than 20.