Issue with FT230x Chip

[obsolete]

Hello EEVblog! I have a question about a current project I am working on. I have designed my first pcb based on the attached schematic, and after ordering and assembling the boards, testing is not going as planned.... First a quick rundown of the schematic.

I am using a FT230x chip in conjunction with the max203 rs232 transceiver in order for serial data from a separate PCB can be read by a tablet application.

The issue: When plugged in the tablet recognizes that a USB device has been plugged in but there seems to be no data being sent from the tf230x chip to the max203 transceiver. The RXD and TXD lines have no data and are defaulted to 5v and 3.3 v respectively.

I am not sure why this is, but I have a few culprits, with one being that I am not using the RTS and CTS pins of the ft230x chip, and the datasheet seems to not go into much detail about the implications of leaving them floating would be. I also did not include 10k pullup resistors to vccio on the RXD and TXD lines which could be causing an issue as well. There seems to be no other issues in terms of unconnected power traces and the internal charge pump of the max203 chip seems to work as well. Maybe these arent the issues at all and I should try a redesign of the schematic and board entirely. I would just like someone more knowledgable than I am to help, thank you!

[Helix70]

V+ on the MAX chip?
Ground pin  from the USB connector to the FT230?

[H.O]

V+ (pin8) on the MAX203 is the internally generated +10V however Vcc is on pin 7 and GND on 6 & 9, neither of which are shown in the schematic. Are they connected across the 5V rail and decoupled properly on your PCB?

Also, make sure it IS a MAX203 you have. That's the one with built in capacitors, most others need external caps for the chargepump circuitry.

[HowardNamath]

How are you sending data from the tablet to this board? Do you have a terminal application you're using to send characters to the virtual COM port?