I am using an FTDI chip for USB-UART conversion. The UART i/f on the MCU operates on 2.4V. Typically the VCCIO pin that powers the UART i/f on the FTDI IC is driven by the 3V3OUT pin [3.3V]. While the VCCIO pin description allows for a voltage other than 3.3V to be applied, I haven't seen any reference design that doesn't use the 3V3OUT connected back to VCCIO.
For people who have worked with the FTDI IC before, are there any gotchas? or is it OK to connect the VCCIO pin to 2.4V that is generated from the VCC (+5V) supply to the IC.