我在使用cc2640的adc的时候，通过sensor controller来控制adc。选择adc的参考电压为电池电压的时候，即配置：ADC_REF_VDDS_REL参数。再通过adc来采集电池电压：ADC_INPUT_VDDS。
发现这个读到的值不是0xFFF，而是0xF87，偏差有点大。这是为什么呢？
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