投射式电容触摸屏控制芯片设计  

Design of a Sensor Controller IC for Projected Capacitive Touch Panel

作　　者：詹思维[1] 魏廷存[1] 李博[1] 刘伟[1] 

机构地区：[1]西北工业大学计算机学院,西安710072

出　　处：《微电子学》2013年第3期364-368,共5页Microelectronics

基　　金：陕西省科技统筹创新工程计划项目(2011KTCQ01-22);西北工业大学研究生创业种子基金资助项目(Z2012123)

摘　　要：设计了一种用于投射式电容触摸屏的新型触摸信号检测方案和触控芯片。采用差分驱动单端感应方法,检测手指触摸导致的互电容变化。该方案可完全消除鬼点,并实现多点触摸的检测。触控芯片的信噪比为23.2dB,采用0.13μm CMOS工艺制造,芯片尺寸为1.8mm×2.0mm。芯片模拟和数字电路的工作电压分别为3.3V和1.8V,动态和静态电流分别为450μA和45μA。A touch sensor controller IC with a novel touch sensing scheme for projected capacitive touch panel was proposed,in which differential driving and single-end sensing method was adopted to measure variation of mutual capacitance caused by touching.By using the proposed scheme,ghost patterns could be totally removed and multi-touch sensing could be easily achieved.Fabricated in 0.13 μm CMOS process,the chip occupied a silicon area of 1.8 mm × 2.0 mm.The touch sensor controller IC had an SNR of 23.2 dB,and it consumed dynamic and static current of 450 μA and 45 μA from analog and digital supply voltages of 3.3 V and 1.8 V,respectively.

关 键 词：投射式电容触摸屏 互电容 自电容 差分驱动 

分 类 号：TN492[电子电信—微电子学与固体电子学]