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ADS1255数字电压为+3.3V，那么数字接口就应该是以+3.3V为基准的，51单片机+5V的，那么这两个元件可以用SPI模式通信吗，求解？
ADS1255的SPI是兼容5V电压的，可以使用
可以，当信号3.3V的从ADS1255（VOHmin=0.8*VDD=2.64v）到MCU （VIH=2V）可以识别出高低电平，当信号从MCU到ADS1255时允许的VIH为5.25V,所以电平上没有问题。
