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cc2530检测电池电压设计

Other Parts Discussed in Thread: CC2530

请问TI大神,我想检测电池的电压,达到低电报警的效果:

使用了内部的vdd/3通道,内部参考值1.25v电压,无论选用多少的分辨率,检测到的电压都是3.6-3.7v;

我实际供电是用cc-debug供电的,只有3.3v;

这误差太大了,请问,从软件或硬件上怎样减小误差呢;

谢谢!