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请问有关ADS1115的问题

Other Parts Discussed in Thread: ADS1115

     请问ADS1115在单电源供电的情况下,选择AINP = AIN3 and AINN = GND,而AIN3脚输入负电压,这时能进行转换吗?我接了一个试了一下,好像可以,但是看数据手册,这时的输入电压要大于0,为什么?请教。