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430f149频率测量波形转换求助

Other Parts Discussed in Thread: MSP430F149频率测量我是用定时器a的捕获来实现的。输入信号为幅值0.5-5v的正弦信号,频率5-50k。怎样设计电路让最小幅值0.5v的正弦信号放大到430定时器a可以捕获的范围。电源供电是usb的5v供电。
  • 你好!

    0.5V是可以达到MSP430F149 VIL的要求的,但是5V直接输入MCU时不好的,超过了MCU的IO能够承受的最大电压,容易烧管脚。

    建议串电阻或者增加电平转换芯片。