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EETE FEB 2016

Keys, Sliders and Proximity Turnkey Solutions The MTCH10X capacitive touch controllers provide the fastest and simplest way to evolve from mechanical buttons to modern touch. Designed for direct button replacement, the MTCH10X family provides dedicated digital output for every input channel while implementing latest noise suppression technologies. ■ From 1 to 8 sensors ■ Water resistance ■ Proximity ■ Packaging as small as 2 × 3 mm DFN MTCH10X Evaluation Board (DM160229) The MTCH10X Evaluation Board provides an out-of-the-box experience for performance and the robustness of Microchip touch solutions. The CAP1XXX capacitive touch controllers provide a wide variety of slider, button and proximity functionality. A Graphical User Interface (GUI) allows the designer to analyze sensor data and easily configure the controller. ■ From 1 to 14 sensors ■ Up to 11 LED drivers ■ Enhanced proximity option with guard ring ■ I2C or SPI communication ■ 1.8–5.5V ■ As small as 2 × 3 mm TDFN or optimized for manufacturing as SOIC. CAP1188 Evaluation Board (DM160222) The CAP1188 evaluation kit provides an easy platform for evaluating and developing a variety of capacitive touch sense applications and LED configuration using CAP11XX family. CAP1298 Evaluation Board (DM160223) The CAP1298 evaluation kit provides an easy platform for evaluating and developing a variety of capacitive touch sense and proximity applications using CAP12XX family. Metal-Over-Capacitive Technology In addition to capacitive touch, Microchip has developed metal-over-capacitive technology enabling: ■ Metal surfaces such as stainless steel or aluminum ■ Sense through glove support ■ Waterproof designs ■ Braille-friendly interfaces Metal-over-capacitive technology is implemented with the same Microchip hardware, PCB, electronics and firmware as capacitive touch technology. How It Works A metal-over-capacitive touch system uses a conductive target layer suspended over a capacitive touch sensor, to act as a second capacitor plate. When the user applies a downward pressure on the target, the resulting deformation moves the center of the target closer to the capacitive sensor. The change in spacing produces a change in capacitance, which is then measured by the touch controller. Application Notes The target can be a sheet of metal with the Fascia marking screen on the outer surface, a metal flashing on the back of a plastic fascia, or a co-molded layer composed of both metal and plastic. The spacer layer is typically an adhesive with a cut out over the capacitive sensor, and the sensors themselves can be either printed conductive pads on a plastic film or pads etched into the top surface of a PCB. ■ Techniques for Robust Capacitive Touch Sensing, AN1334 ■ mTouch Sensing Solution Acquisition Methods Capacitive Voltage Divider, AN1478 ■ Proximity Design Guide, AN1492 ■ CAP1XXX Capacitive Touch Controller Tuning Guide, AN2034 ■ mTouch Metal-Over-Cap Technology, AN1325 and AN1626 ■ Capacitive Touch Using Only an ADC (CVD) (suitable for PIC10/12/16/24H/32 MCUs), AN1298 For datasheets, user’s guides and general design information please visit www.microchip.com/touch. Touch and 3D Gesture Control 3


EETE FEB 2016
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