Cypress CapSense CY8C20x36 Betriebsanweisung PDF herunterladen (Seite 74)

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

Figure 8-6 shows examples of footprints for springs. Do not place solid grounds under the springs as this complicates

the spring soldering and increases the native capacitance of the sensors.

Figure 8-6. Proposed Spring Footprints

Spring Contour

PCB

Solder points

Trace to

PSoC

8.1.3 CapSense and Mechanical Button Combination

The hollow space inside a spring can also be used as a mechanical button, as shown in Figure 8-7.

Figure 8-7. CapSense and Mechanical Button Combination

Touching such a button only triggers the sensor, while pressing the button activates both the sensor and mechanical

button. In this case, preparatory actions such as backlighting, prompt showing, and others are possible only if the

sensor works. The final action is performed when both buttons work. For example, in a GPS navigation system,

touching a button shows only a hint and pressing the button takes an action.

8.1.4 Design Examples

Figure 8-8 and Figure 8-9 show project demonstrator examples for white goods applications.

Figure 8-8. Demo Cooktop

Figure 8-9. Cooktop Front Panel

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Cypress CapSense CY8C20x36 Betriebsanweisung Seite 74