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ADS1115采样返回Conversion Register寄存器值为0x1FFF的问题

Other Parts Discussed in Thread: ADS1115

你好,最近在调试ADS1115.。输入电压在1.5V以时,Conversion Register寄存器值经计算与输入电压值相符。当输入电压小于1.5V时,Conversion Register寄存器值一直保存0x1FFF不变。软件配置如下:ConfigRegister写入值为0x40,0xe3,等待约400ms后开始读取Conversion Register寄存器值。芯片有更换过,现在不知道问题出在哪里。另外,想问下,转换时间一般最小需要多长时间,感谢您的反馈!