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求助如何采集高于3.3V的模拟电压?



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!