F3AD04-0N
F3AD04-0N
F3AD04-0N
MCU电路采用Holtek公司的RISC单片机--HT47RB70.该单片机是A/D转换型8位USB单片机，专门为USB产品而设计，尤其适用于USB或SPI接口触控屏、触控按键等产品。
基于HT47RB70的电感式触摸屏MCU电路如图7所示。HT47RB70采用上电复位方式进行复位，AX、BX、CX和AY、BY、CY与其PD0~PD2和PA0~PA2引脚分别作为X轴和Y轴电子开关电路的选择端。PD3~PD6和PA3~PA6分别作为X轴和Y轴上电子开关电路的使能端。PE0~PE2作为信号修正电路的控制端。通过触摸电压处理电路后的信号通过PB0/AN0输入单片机，经过单片机内部的A/D转换器得出触摸电压的值，从而辨别出触摸效果。频率信号通过PC0/INT输入单片机，通过单片机在单位时间内对方波个数的计数，即可得出信号的频率。后通过将触摸信号转换成标准鼠标信号，通过USB接口输出到计算机，达到触摸效果。
厦门泰尼电气有限公司
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