I²C连接的触摸传感器控制器

　　I²C连接的触摸传感器控制器

　　触摸屏集成到液晶显示器（通常是TFT）或作为一个PCB的一部分已经成为事实上的现代手持设备用户界面。主要基于电阻和电容技术，这些透明或不透明表面取代机械开关，薄膜开关，圆顶开关和按钮提供嵌入式微处理器与用户界面的信息，远远不只是一个按钮按下。

　　专用触摸屏接口芯片的出现帮助表白的主处理器，提供额外的功能。虽然他们可能会增加成本，需要更多的PCB空间，他们允许工程师使他们的设计推向市场更快，并具有高度测试和可靠的触摸技术。

　　本文论述了我²C连接触摸屏控制器。所有的部件、数据表、开发工具和培训材料提到这里可以Digi-Key的网站上找到。

　　Beyond connectivity

　　User interfaces have moved far beyond switches and contact closures. Gestures for expanding a view， contracting a view， or scrolling， for example， accomplish more than is possible via any single discrete button or switch. Circular motion also replaces the mechanical JOG rings made popular by early iPods. Sliders， which used analog trimmer resistors， are also being replaced by touch-sensitive technology.

　　All this capability and flexibility means more processing horsepower is required to detect， de-code， debounce， and pass along user intent to a host processor. This means either a higher-performance （and more costly） processor or a dedicated controller is needed.