HA-655-4-200
HA-655-4-200
很多LCD模块都采用了电阻式触摸屏，这些触摸屏等效于将物理位置转换为代表X、Y坐标的电压值的传感器。通常有4线、5线、7线和8线触摸屏来实现，本文详细介绍了SAR结构、四种触摸屏的组成结构和实现原理，以及检测触摸的方法。
电阻式触摸屏是一种传感器，它将矩形区域中触摸点（X，Y）的物理位置转换为代表X坐标和Y坐标的电压。很多LCD模块都采用了电阻式触摸屏，这种屏幕可以用四线、五线、七线或八线来产生屏幕偏置电压，同时读回触摸点的电压。
过去，为了将电阻式触摸屏上的触摸点坐标读入微控制器，需要使用一个专用的触摸屏控制器芯片，或者利用一个复杂的外部开关网络来连接微控制器的片上模数转换器（ADC）。夏普公司的LH75400/01/10/11系列和LH7A404等微控制器都带有一个内含触摸屏偏置电路的片上ADC，该ADC采用了一种逐次逼近寄存器（SAR）类型的转换器。采用这些控制器可以实现在触摸屏传感器和微控制器之间进行直接接口，无需CPU介入的情况下控制所有的触摸屏偏置电压，并记录全部测量结果。本文将详细介绍四线、五线、七线和八线触摸屏的结构和实现原理。
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〈〉公司名称：厦门泰尼电气有限公司
〈〉Xiamen Thani electric co.,ltd
〈〉公司简称：泰尼电气
〈〉销售区域：全球
〈〉公司经营各类电工电气品牌：
〈〉abb、Allen-Bradley、Siemens、Fanuc _-_-- plc可编程控制器
〈〉Schneider、Westinghouse、Ge、英维思集团 _-__- dcs集散式控制系统
〈〉联系人：黄小姐(销售代表)
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