触摸感应按键设计指南
触摸感应按键设计指南 _Ver1.1 2/12页
目
目目
目 录
录录
录
1. 概述 ............................................................................................................................................ 3
2. 触摸按键设计指导........................................................................................................................ 3
2.1 触摸按键的原理 .................................................................................................................... 3
2.2 触摸按键的按键形式 ............................................................................................................. 3
2.2.1
单个形式---按键 ......................................................................................................... 3
2.2.2
复用形式---复合按键 .................................................................................................. 4
2.2.3
弹簧触摸按键 ............................................................................................................ 4
2.2.4
组合形式---滑条 ......................................................................................................... 5
2.2.5
组合形式---滚轮 ......................................................................................................... 5
3. PCB Layout技巧........................................................................................................................... 6
3.1 减小PCB的基准电容 ............................................................................................................. 6
3.1.1
铺地形式及铺地间距 .................................................................................................. 6
3.1.2
感应走线 ................................................................................................................... 7
3.2 避免干扰 .............................................................................................................................. 9
3.2.1
触摸芯片电源 ............................................................................................................ 9
3.2.2
触摸芯片位置 .......................................................................................................... 10
3.2.3
其它元件布局 .......................................................................................................... 10
4. 介质 .......................................................................................................................................... 11
5. EMC设计建议............................................................................................................................. 11
