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关于CC2540 ADC检测问题

Other Parts Discussed in Thread: CC2540

大家好:

              我用CC2540 P0.7作为ADC检测,目前有一个问题,用电源直接接到P0.7上面算出来的电压误差基本都在小数点后两位(0.01~0.02),但是通过分压的方式(10K和100K,接3.3V AVDD)ADC测输来的值偏差都在小数点后一位(0.15~0.2左右),这是为什么呢?有没有什么解决办法?谢谢