触摸按键CapSense®入门.pdf

1. 简介 .......................................................................................................................................................................71.1 如何使用本指南 ...........................................................................................................................................71.2 代码示例......................................................................................................................................................71.3 赛普拉斯 CapSense 的优点.........................................................................................................................71.4 CapSense 设计流程.....................................................................................................................................81.5 文档规范......................................................................................................................................................92. CapSense 技术...................................................................................................................................................102.1 CapSense 系统概述...................................................................................................................................102.1.1 硬件组件 .......................................................................................................................................102.1.2 固件组件 .......................................................................................................................................122.2 电容式感应方法 .........................................................................................................................................122.2.1 自电容...........................................................................................................................................122.2.2 互电容...........................................................................................................................................142.3 CapSense 感应技术...................................................................................................................................152.3.1 电容转换 .......................................................................................................................................152.3.2 含 Sigma Delta 调制器的 CapSense（CSD） ..............................................................................152.4 CapSense 调校..........................................................................................................................................172.4.1 定义 ..............................................................................................................................................182.4.2 SmartSense 自动调校...................................................................................................................192.5 信噪比（SNR）.........................................................................................................................................212.5.1 SNR 的测量 ..................................................................................................................................222.6 CapSense Widget......................................................................................................................................222.6.1 按键（零维传感器） .....................................................................................................................232.6.2 滑条传感器（一维传感器）...........................................................................................................242.6.3 触摸屏和触控板（两维传感器）....................................................................................................262.6.4 接近感应传感器（三维传感器）....................................................................................................262.7 传感器结构.................................................................................................................................................262.7.1 铜线耦合电场（PCB）..................................................................................................................272.7.2 通过弹簧/垫圈/泡沫耦合电场.........................................................................................................272.7.3 通过电子印墨耦合电场..................................................................................................................282.7.4 通过玻璃上的 ITO 薄膜耦合电场...................................................................................................282.8 防水功能....................................................................................................................................................282.8.1 水滴和水流对 CapSense 产生的影响............................................................................................292.8.2 驱动屏蔽信号和屏蔽电极 ..............................................................................................................