2.2 Electrode Design
The twelve on-board electrodes are designed as standard touch buttons with shield options. The Buttons are designed in different sizes to explore various real-world application scenarios. The electrode overlay is 1 mm the thickness of SABIC™LEXAN™8010 polycarbonate film, secured with 3M™Adhesive Transfer Tape 467.
Touch sensor generation using the Altium tool is available. For more details, check the Touch Sensor Altium Designer® Plugin.
The schematic and layout for the sensors follow the design rules provided in the Microchip application note: AN2934, "Capacitive Touch Sensor Design Guide"(DS0002934).
Complete CAD files for the MTCH2120 Evaluation Kit board are available at the Microchip web site: https://www.microchip.com/en-us/development-tool/EV64Z42A.