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msp430输入电压是3.3V,那么A/D输入电压范围是多少?
0 to REF+ 不知道你说的具体是哪款芯片,数据手册上一般会给出REF,仔细看一下
(Gnd) < (REF-) < (ADC input) < (REF+) < (Vcc)
如果是片内ADC的话,一般都不要超过3.3V,注意先用表笔打好电压,然后分压才能去接AD通道