Maximum allowed noise in CapSense | Cypress

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Maximum allowed noise in CapSense

Last Updated: March 13, 2012
Question: 

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

Answer: 

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.
 

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