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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/622822/ds90ub947-q1-ds90ub947-i2c-power-supply-question
您好，
DS90ub947电源和I/O电源最大电压为1.8V，为什么I2C可以支持3.3V电源？ 谢谢！
I2C电压电平带选件有I2CSEL引脚。内部暗示了电平移位。
通过10kΩ Ω 电阻器与VDDIO绑定，以实现1.8V I2C操作。
保持浮动状态，以进行3.3V I2C操作。
