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msp430f149 内部12位AD 怎么用

Other Parts Discussed in Thread: MSP430F149

TI 工程师 :你好,请问msp430f149 的内部AD在采用 内部基准和外部基准的时候 测量出的电压怎么不准呢? 若果用电源作为参考是比较准确的额,但是换为内部2.5V 或外部基准源,就不准了 ,怎么解决 ?谢谢