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ADS1198: ads1198 dvdd 1.8V mcu 和 3.3V mcu的问题

Part Number: ADS1198
Other Parts Discussed in Thread: ADS1298,

我设计了一块采集心电的板子,电源通信都留出了接口,dvdd接3.3V mcu(spi 3.3V的mcu)可以正常通信,但是改为1.8V(spi 1.8v 的mcu)给dvdd供电后 使用逻辑分析仪查看 可以看到MOSI正确的发送了数据,但是MISO一直返回0,请问这是什么情况。