Cypress CapSense CY8C20x36 Guia do Utilizador descarregar pdf (Página 18)

18 Document No. 001-64846 Rev. *I Getting Started with CapSense

Figure 2-10. Different Noise Levels in Design A and B Being Compensated Automatically

2.4.4.3.2 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 2-11. Noise spikes is a powerful feature prevents false button presses in the end

system, which prevents a failure analysis for a mass production design.

Figure 2-11. Finger Threshold Dynamically Adjusted to Prevent False Button Touches

2.4.5 SmartSense_EMC (SmartSense Electromagnetic Compatible)

In addition to the SmartSense Auto-Tuning algorithm discussed previously, the SmartSense_EMC user module

includes a unique algorithm to improve robustness of capacitive sensing algorithm/circuit against high-frequency

conducted and radiated noise.

Every electronic device must comply with specific limits for radiated and conducted external noise. These limits are

specified by several regulatory bodies (for example, FCC, CE, U/L, and so on). An excellent PCB layout design,

power supply design, and system design is mandatory for a product to pass the conducted and radiated noise tests.

In some instances, ideal design practices cannot be followed because of the cost and form factor limitations of the

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Cypress CapSense CY8C20x36 Guia do Utilizador Página 18