在智能手机中使用的按键开关控制器

摘要：本应用笔记介绍和比较两个键扫描在智能手机的关键垫常用的方法。这表明，省去了EMI滤波器使用低EMI方法的好处。估计也与ESD保护二极管的电容负载津贴。

Maxim > Design Support > Technical Documents > Application Notes > High-Speed Interconnect > APP 4666
Keywords: key switch, key scan, switch matrix, controller, baseband, passive, conventional, power spectrum density,
PSD, electro magnetic interference, EMI, debounce, row, column, port
May 10, 2012
APPLICATION NOTE 4666

Using Key-Switch Controllers in Smartphones
By:Walter Chen, Principle Member of the Technical Staff, Applications
May 10, 2012

Abstract:This application note describes and compares two key-scan methods commonly used in smartphone key pads.
It shows the benefit of eliminating the use of EMI filters for the low EMI method. The capacitive loading allowance
associated w