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DSP28335输出



我用示波器观察GPIO输出电压峰值能够达到3.6V,而我想通过GPIO输出口进行电阻分压控制在3.3V以内,请问分压的阻值如何选择呢?或者还有其他可以限制电压峰值的方法吗?
先谢谢各位了!!