FT230X direct interfacing with 5V uC like PIC24FV &/ PIC18
The level of the FT230x UART signals are determined by VCCIO which can be between 1.8V and 3.3V. Vih on the PIC is 0.8VDD so at 5V that would be 4V which would not be met by the FT230x. So you would need a level shifter to go between 3.3V and 5V, or use 3.3V to power the PIC.