RX113 Group Design Guide for Renesas Touch Solution
The RX113 group has incorporated hardware (Capacitive Touch Sensor Unit; CTSU) that detects human body contact by measuring capacitance existed between touch electrode and human body.
This application note introduces the principle of capacitive touch detection as well as explains the detail of current-frequency conversion system that is used in RX113.
A capacitive touch switch using the capacitance generated between human body and touch electrode is widely used for home appliances, AV equipment, automotive, and industrial equipment including smart phones.An example of a product using capacitive touch is shown in Figure1-1.The surface is covered with a uniform plastic and there is no projections or cutouts in the design.The “switch” is defined by characters which are highlighted using LED backlighting.The touch switch is robust as there are no mechanical parts and it is much simpler than mounting a physical switch into the curved surfaces.The touch technology also allows detection of finger movement so sliders, wheels and simple keypads can be implemented.This is difficult to achieve by the conventional switch.
This application note introduces the basis of capacitive touch, the detail of capacitive touch switch detection of Renesas’ original system, and examples of capacitive touch switch with our system.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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Dec. 1, 2014 |
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Ver. 0.9 |
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R01AN2516EU010 |
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2.7 MB |
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