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NT0660AS16 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers

Part # NT0660AS16
Description  Nuvoton 鰲?뫖?됮뵰??뎴
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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Logo ETC2 - List of Unclassifed Manufacturers

NT0660AS16 Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers

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NT066E
2015/12/21
第 9 页 总24页
版本 1.0
4
电容性触摸按键系统描述
输入电路
4.1
每一个触摸按键有触摸板至芯片管脚必须串联一个电阻,如图4-1,不同的系统板设计此电阻的
数值无需更改,但在PCB布线时请尽量靠近感应电极。
Touch Pad
22pF
33K
0.01uF
1M
1N4148
CP1
SENn
图 4‑1 触摸按键设计参考电路
感应电极与地线
4.2
感应电极的尺寸建议采用直径 8 mm 或以上的圆形,感应电极的面积越大,感应效果越好,原则
上可以做成任何形状,但是必须符合手指接触感应的有效面积。感应电极周围无需铺铜地线,感
应电极到芯片的信号线则可以铺铜地线,如图 4-2,感应电极到芯片的信号线可采用 0.254 mm
(10 mil) 或更细的线宽,与铺铜地线至少距离 1 mm 以上,PCB的其他层则可以铺网状地线,避
免信号线被干扰。每一个感应电极的附属零件在PCB布线时要尽量靠近感应电极,且IC与感应电
极尽量在同一片PCB上。
Sensor
Pad
GND
GND
0.254mm(10mil)
>1mm
>1mm
图 4‑2 触摸感应电极与接地方式
感应电极也可以用弹簧加铁片来实现,如图4-3,铁片必须平整用以保证与面板之间完全接触,
形成有效的感应面积。如果感应电极中间要安装LED,而必须将感应电极中间挖出透光的孔,则
必须加大感应电极的面积,至少要能补回挖孔所损失的面积。


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