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ads1115差分采集负电压一直是65535

Other Parts Discussed in Thread: ADS1115

ADS1115配置为差分方式(IN0为正,IN1为负)PGA=±2.048,供电电压3.3v,连续转换。

当ADS1115芯片引脚口电压 对芯片GND量IN0=1.57,IN1=0.92,此时差分电压0.648,AD值为10410,一切正常

当我改变外部电压正负后,ADS1115芯片引脚口电压 IN0=0.92,IN1=1.57,此时差分电压-0.648,AD值为65535,无论如何改变输入值这个数保持不变。

当配置成单端采集时均能采到正常电压。