there shouldn't be any issueslevel conversion will not be needed, just disable internal pull-up resistors and use external pull-up resistors that "pull" to 3.3V
So the 5V signals coming from the 5V board won't overdrive the 3V3 pins?
Quote from: magnethead794 on Sep 01, 2012, 05:43 amSo the 5V signals coming from the 5V board won't overdrive the 3V3 pins?That's why you use external pull-up resistors.
Research "open collector".The I2C pins are open-collector. They need to be pulled-up so if you external resistors and pull them up to 3.3V they become 3.3V pins.