Today, the overwhelming majority of I2C devices are 3.3 V logic ... you will want a level shifter circuit. At their simplest, two N-FETs like 2N7002 will do wonders. If you want smaller PCB ...
What to do? [Linux-works] built this I2C level converter to solve the problem. The circuit comes from an NXP app note (PDF) on the issue. You can take a quick peek at the suggested schematic from ...
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