实验中需要采集5V电压，因为高于430 3.3V的工作电压，如果采用内部ADC进行采集，应该如何实现？
430的内部ADC采用外部输入参考电压5V是否可行？
另外也有提到用电阻分压至430允许电压范围内的，电压阻值是否有要求？
请专家指点，谢谢！
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