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TMS320F2802 AD 采样问题

Other Parts Discussed in Thread: TMS320F2802

用TMS320F2802 芯片利用例程V170做AD采样时,发现采样不正常,不接外部模拟电压时,该采样脚上的电压不正常,大于3.3V,在3.7V左右,请大侠告诉一下,是什么原因?谢谢!