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PGA308没有输出

Other Parts Discussed in Thread: PGA308

最近想用PGA308来做测量温度温度电桥的输出,但按照下图焊好板子后却怎么配置都没有输出。麻烦各位看看是哪里出了问题:

另外想问问大家,如果用单片机串口和PGA308通信,是把串口的两根线都接在1W引脚上吗?谢谢大家!