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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AN2869 Fiches technique(PDF) 17 Page - STMicroelectronics |
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AN2869 Fiches technique(HTML) 17 Page - STMicroelectronics |
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17 / 43 page  AN2869 Surface electrode design Doc ID 15298 Rev 6 17/43 3 Surface electrode design 3.1 Touchkey sensor A touchkey can be either touched or untouched by the user. So the information that is managed by the microcontroller is a binary one (e.g. ‘0’ for untouched and ‘1’ for touched). The sensor can be any shape, however it is recommended to use round or oval as these shapes are the simplest. The libraries and hardware cells automatically compensate for capacitance differences, but the acquisition time and processing parameters can be optimized if the electrodes have similar capacitance. For this reason, it is recommended to use the same shape for all electrodes. The touchkeys can be customized by the drawing on the panel. When designing touchkey sensors, two parameters must be taken into account: 1. The object size to be detected 2. The panel thickness Regarding object size (see Figure 10), it is recommended to design a sensor in the same range as the object to be detected. In most cases, it is a finger. Figure 10. Sensor size OK |
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