低成本电容式触摸按键设计  

Design of low cost capacitive touch buttons

作　　者：周志永[1] 胡建人[1] 

机构地区：[1]杭州电子科技大学新型电子器件与应用研究所,浙江杭州310018

出　　处：《机电工程》2011年第3期365-368,共4页Journal of Mechanical & Electrical Engineering

基　　金：浙江省自然科学基金资助项目(Y1080589)

摘　　要：为解决传统的机械式按键输入方式易磨损、寿命短等问题,将电容式触摸技术应用到触摸按键之中,开展了对电容式触摸感应技术的分析,电容式触摸技术电路简单,只需要一个微处理器和一些外围电路就可以实现按键的检测与控制,因此适用于各种家用电器。首先介绍了电容式触摸控制的基本原理,本着降低成本和提高可靠性的前提,采用PSoC通用型芯片CY8C24423取代常规使用的CapSense型芯片,并给出了具体的软、硬件设计方案。研究结果表明,所设计的电容式触摸按键精度高、灵敏度可调、误操作率低,具有很大实用价值。In order to solve the problems of the traditional mechanism button which is slide and short life,the capacitive touch technology was used in touch buttons.It is widely used in many home appliances because of its simple circuit： just need one MCU and some other peripheral circuits.At first,a general introduce was given to this technology.To reduce the cost and improve the reliability,general-purpose chip PSoC CY8C24423 was used to replace the CapSense one,designs both hardware and software were included.The experimental results show that the capacitive touch buttons have a high precision,low wrong operation rate and adjustable sensitivity.

关 键 词：电容式触摸 PSOC 灵敏度 CY8C24423 

分 类 号：TP334.7[自动化与计算机技术—计算机系统结构]