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请问msp430F169芯片的adc12内阻是多少?我用的是4.2v锂电池,直接接了2M/2M的电阻接地,用430内部adc12,内部2.5v参考电压采样,将测量结果乘以2得到电池电压。结果偏小,是不是adc12的内阻原因造成的?