Cypress CapSense CY8C20x36 Guía de usuario descargar pdf (Pagina 19)

Getting Started with CapSense

Document No. 001-64846 Rev. *I 19

product. SmartSense_EMC with superior noise immunity is well suited and useful for such applications to pass

radiated and conducted noise tests.

2.5 Sensor Types

Capacitive sensors can be broadly classified into four categories: buttons, sliders, touchscreens / trackpad, and

proximity sensors. Different sensor types cater to different market segments.

Figure 2-12. Types of Capacitive Sensors

Button (zero-dimensional) Slider (one-dimensional)

Touchscreen and Trackpad (two-dimensional) Proximity (three-dimensional)

2.5.1 Buttons (Zero-Dimensional Sensors)

CapSense buttons are used in a wide variety of applications including: home appliances, medical devices,

televisions, monitors, audio systems, photo frames, notebooks, home security systems, white goods, industrial

products, and lighting controls. To get higher reliability, lower cost, and appealing industrial design, use CapSense

buttons instead of mechanical buttons.

2.5.1.1 Simple Buttons

The simplest capacitive sensor consists of a copper pad connected to a CapSense controller pin with a trace. A

button is defined as the combination of the copper sensor pad and the nonconductive overlay material. The button is

surrounded by grounded copper hatch separated by an annular gap. Each button requires one I/O pin of the

CapSense controller.

Figure 2-13. Typical Simple Buttons

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Cypress CapSense CY8C20x36 Guía de usuario Pagina 19