Capacitive and Resistive Touch Sensing Application

The circuit is comprised of CRTOUCHB10VFM 32-pin Xtrinsic Touch-Sensing Platform that is design to serve as a four wires and five wire resistive touch driver, and capacitive touch sensing device. The MK02FN64VLH10 100 MHz Cortex-M4 Based Microcontroller with Floating Point Unit (FPU) is used as host controller. The capacitive touch and resistive touch are provided for user interaction that also serves as the touch sensors of the entire system. The resistive touch uses pressure for sensing while capacitive touch uses electrostatic field distortion that produces measurable change in capacitance. The capacitors are used to minimize distortions in supplies. The resistors are used as limiters and pull-ups. The SPST switch is used to control selection of setups and configurations in UART and I2C communications.

The migration of visual display medium is now noticeable that most of the electronic devices with display are now touchscreen. This design can serve as a reference for the development of touchscreens that is used in different electronic products including industrial and commercial equipments. Due to its flexibility, there will be several applications of this designed system.