Hello.

I am trying to connect a flow meter to a teensy 3.2 via I2C communication. I once connected two Arduino using I2C, but I've never connected two different devices before. The flow meter I am using is the SFM3300-250-D and its datasheet can be found here.

The flow meter runs on 5V, so I'm a little worried about connecting the flow meter directly to the teensy. Should I be worried that a 5V signal from the i2C bus damage the teensy? I know that teensy 3.2 I/O pins are 5V tolerant, but I'm worried any small voltage fluctuation could still cause damage.

Thanks as always.