Knowledge Base Article
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.