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ADS1255 上电后输出问题

Other Parts Discussed in Thread: ADS1255

ADS1255应用问题:

    采用STM32F407 控制2片ADS1255  50sps速率进行ADC采样,使用外部基准,单元上电后偶然会出现STM32F407 输出的2片ADC的转换值,较输入ADC的电压值大20%的现象,测量VREF电压稳定(2.498V)断电后重新上电,STM32F407 输出的2片ADC的转换值与输入ADC的电压值就相同了,不知道是何原因?请提供参考建议