2.2K Resistors on Microchip Data Input Lines
If the resistors you see are going from the signal line to the supply rail, The resistors you see on the I2C lines are pull up resistors that are required for proper communication on an I2C bus. The I2C protocol uses something called open collector outputs to the data bus. Basically what this means is that a device sending data can only pull a line low. Because of this, both the data line and the clock line of an I2C bus requires a pull up resistor, usually around 1 to 10k.