用CC2541的AD采集外部传感器数据，使用1.25V参考，12位分辨率。在非低功耗模式下采集的AD值基本正常，接近0，当处于低功耗模式下时，即使AD脚的电压为0V，经常采集到的AD值为1600左右，这个一般是什么原因，有解决方案吗？
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