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您好！AIN0、AIN1作为差分输入，1）当AIN0输入正电压时，AIN1接GND，读取输出电压值正确；2)当AIN输入负电压时，AIN1接地，读取输出电压值不正确；请问是为什么呢？
芯片管脚可能不能输入对地负压。差分输入ADC一般建议把共模电压设置为VCC/2。
