Cypress Semiconductor CY8C21534 Especificações descarregar pdf (Página 25)

The pads are then milled out of circuit board material and connected accordingly to the

circuit. This can then be hidden behind glass or thin paper to visually enhance the

technology. The layout of the sensor pad can be seen in figure 13.

Figure 13: Capacitive Sense Button Layout. Taken from Cypress Capsense layout

guidelines [12].

The button and ground plane are milled onto a printed circuit board. There is a

separation gap between them, shown in figure 13. The sensor pad is taken into an

input of the MCU by way of a trace, and the capacitance is read between the input and

the ground plane.

The integration of capacitive touch capability into embedded systems has become a

widely used form of system control. The use of capacitive touch buttons is attractive in

that there are no moving parts, so necessary maintenance of the user interface is

lowered. The buttons can also be adjusted to work under a pane of glass or plastic,

keeping the usability while increasing the ability to keep the user interface clean and

functional.

One application of the capacitive touch sensors that has become widely used is buttons

on public electronic machines, for example train station ticket machines. Today the

application of capacitive touch sense to things such as kitchen appliances,

television remote controls, and hand held video games is also seen. As some touch

pads can be designed to give multi-functions, the usability of the interfaces becomes

much greater, for example the touch screen of a cell phone with press and slide

controls.

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Cypress Semiconductor CY8C21534 Especificações Página 25