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For all the ICs used a 3.3V signal should be read as a logic 1 so you don´t need to use a level shiftter. Just tie the pull-ups to a 3.3V source. Their value depends on the speed (up to 400kHz in Fast Mode), bus capacitance and the current sinking capabilites of the drivers (please refer to the I2C spec.). A 1k5 resistor would be a good starting point.
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