RCM4400W & I2C

HI,
I’ve a little question…
I want drive one device with I2C.lib.
My device accept input range voltage from 2.5V to 6.0V. But the output port (in ex. PD, PB, PC, etc.) of my RCM4400W is 1.8V. I’m not understanding if that is correct, becouse in the documentation of RCM4400W the output of the port is 3.3V. Is possible change this voltage from 1.8V to 3.3V like is write?

Moreover, if the I2C.LIB it use for RCM3000 with tension level around 5.0V, for the RCM4400W there’s problem?
My one little program work in the RCM3700 without problme, but the same program don’t Work correctly in the RCM4400W. You can tell me which modification is necessary in the I2C.LIB for RCM4400W?

Thanks
Best Reguard.

Marcomo

I havent used the I2C yet with the 4400, will soon though. You do have the pull-up resistors connected right?