1.2 Electrode Design

The six on-board electrodes are designed as standard touch buttons, with a diameter of 10 mm and a ring shield of 1.5 mm width. The isolation between the sensor and the shield is 1 mm. The electrode overlay is SABIC™ LEXAN™ 8010 polycarbonate film, secured with 3M™ Adhesive Transfer Tape 467 . The schematic and layout for the sensors follow the design rules provided in Microchip Application Note AN2934, "Capacitive Touch Sensor Design Guide"(DS0002934).

Note: Complete CAD files for the MTCH1060 Evaluation Kit board are available at the Microchip web site: https://www.microchip.com/en-us/development-tool/EV54M59A
Figure 1-2. Electrode Design