Implementation of a High-Performance Touch Controller and Differential Sensing Circuit
نویسندگان
چکیده
Projected capacitive touch panels have been widely used in many mobile application systems such as smartphones and tablet PCs. We fabricated projected capacitive-type touch sensors using printed circuit boards. It has equivalent parasitic capacitive loads with a 10” touch panel. In this paper, we discuss projected capacitive touch technologies and their highperformance touch controllers. We introduced the touch system and built a controller unit for touch applications using a 32-bit microcontroller. A fully differential circuit was designed for an analog front end. The controller unit is implemented using a MicroBlaze core on a Field-Programmable Gate Array (FPGA). A Virtex-4 Xilinx FPGA is used for the controller unit. Keywords-component; Touch; Multi-touch; Sensor; Projected capacitive touch; Touch controller
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