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ADS1247数据采集问题

我现在用1247采集热电阻与热电偶的信号,接口是复用的,热电偶三线制按照典型电路接的,就是有一端是接在参考电压那个引脚上的,然后热电偶用的是另外一个AIN2,AIN3。不知道这种方法是否可行。还有看网上有那种直接用AIN0,AIN1,AIN2设置为通道CH1,CH2不知是否可行?