Cypress CapSense AN64846, Getting Started

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CapSense Technology
AN64846 - Getting Started with CapSense
®
Doc. No. 001-64846 Rev. *X 20
2.4.2.3.1 Different Noise Levels in Different Designs
SmartSense technology dynamically tunes itself (adjusts noise and finger thresholds) for different noise environments.
In
Figure 2-17 , Design A and Design B have different noise levels. To maintain a minimum SNR of 5:1, you must adjust
the dynamic threshold. SmartSense does this automatically, allowing seamless transition from one model to another
with minimal or no tuning required.
Figure 2-17. Different Noise Levels in Design A and B Being Compensated Automatically
2.4.2.3.2 Noise Spikes During Production
SmartSense technology also automatically tunes out the noise spikes (in production) that may not be seen during the
design stage, as indicated in
Figure 2-18 . This is a powerful SmartSense feature that prevents false button presses in
the end system, which prevents a failure analysis for a mass production design.
Figure 2-18. Finger Threshold Dynamically Adjusted to Prevent False Button Touches