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ADS8556: ADS8556 什么情况下输出全负值

Part Number: ADS8556

ADS8556模拟通道输入范围是[-5V,5V],当出现什么异常(排除模拟输入通道为-5V)的时候ADC的所有模拟通道数值通过SPI全部显示为-5V?