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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2869 датащи(PDF) 40 Page - STMicroelectronics |
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AN2869 датащи(HTML) 40 Page - STMicroelectronics |
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40 / 43 page  Projected sensor design AN2869 40/43 Doc ID 15298 Rev 6 Figure 35. Potential false key detection Avoiding false detection Follow these recommendations to avoid false touchkey detection: ● The Tx and Rx tracks should never cross each other; but if they do, it must be at a right angle. ● When the Rx and Tx tracks go in the same direction and to places that are close together, it is better to separate them with a ground which has to be more than twice the width of each signal track. ● To further reduce the coupling between the Tx and Rx tracks, the Tx signal can run under the ground, in this case even if Rx is near the ground, coupling should not happen. ● If the Rx track is behind the Tx track from a user point of view, the user cannot modify the electrical field. Obviously, if Rx and Tx signals are too far apart, there will be no interaction. Furthermore, you can consider these general guidelines: ● The Tx and Rx tracks must be as thin as possible. ● The Rx tracks must be as far as possible from the touchkey. ● When there are several touchkeys, it is better to keep all the Tx tracks together and all the Rx tracks together, which greatly reduces any false touchkey detection. MS18994V1 Panel Rx trace Tx trace PCB |
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