由于线切割工作环境差,湿度和油污的影响,常使键盘部分存在分布电容,而使键入程序不能正常输入,下面我们以单一键为例,其等效电路如图1,其中R=10kΩ,为限流电阻,μ为键扫描反相驱动器。V为键信号输入口,C_1、C_2为分布电容。图2是键盘扫描的程序框图,从图中我 Due to the poor working environment of wire cutting, humidity and oil pollution, often make the keyboard part of the distributed capacitance, so that the typing process can not be normal input, the following single key, for example, the equivalent circuit shown in Figure 1, where R = 10kΩ, Is the current limiting resistor, μ is the key scan inverting driver. V is the key signal input port, C_1, C_2 distributed capacitance. Figure 2 is a block diagram of the keyboard scan, from the figure I