The MCU use 3 volt power supply in my design. And LIS2DH’s VDDIO is 1.8 voltage. And I saw the sentence” There are two signals associated with the I2C bus: the serial clock line (SCL) and the serial data line (SDA). The latter is a bidirectional line used for sending and receiving data to/from the interface. Both the lines must be connected to Vdd_IO through an external pull-up resistor. When the bus is free, both the lines are high.” in your document. So I wonder can I use 3 voltage on external pull-up resistors of I2c.