I2C連接的觸摸傳感器控制器

　　觸摸屏集成到液晶顯示器（通常是TFT）或作為一個(gè)PCB的一部分已經(jīng)成為事實(shí)上的現(xiàn)代手持設(shè)備用戶界面。主要基于電阻和電容技術(shù)，這些透明或不透明表面取代機(jī)械開關(guān)，薄膜開關(guān)，圓頂開關(guān)和按鈕提供嵌入式微處理器與用戶界面的信息，遠(yuǎn)遠(yuǎn)不只是一個(gè)按鈕按下。

　　專用觸摸屏接口芯片的出現(xiàn)幫助表白的主處理器，提供額外的功能。雖然他們可能會增加成本，需要更多的PCB空間，他們允許工程師使他們的設(shè)計(jì)推向市場更快，并具有高度測試和可靠的觸摸技術(shù)。

　　本文論述了我2C連接觸摸屏控制器。所有的部件、數(shù)據(jù)表、開發(fā)工具和培訓(xùn)材料提到這里可以Digi-Key的網(wǎng)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.