MicroFTDI

My take on a tiny modern USB to UART converter.

Specs:

Board Size: 23.8x13.7x1.6mm
Soldered module size: 31.7x13.7x6.4mm
Connectors: USB-C to male 2.54mm dupont headers
Max current supply:

• without regulator: 50mA @ 3.3V
• with regulator: 1A @ 3.3V (often limited by USB supply)

V3:

V3 Changelog:

• Added J1 Jumper that can be connected in order to use internal regulator.
• Switched RX and TX label on LEDs. Now the are labelled from the computer's (USB) perspective, which feels more natural to me.

EasyEDA link:

https://oshwlab.com/Cinbarker/ftdi-c_copy

V2:

Bugs to squash:

• Not sure, however TX ad RX labels might be switched around. According the the datasheet it should be correct. (update: done)
• No easy way to disconnect internal regulator from external one without scratching out a copper trace which is difficult to do. (update: done)

Improvements:

• Add zero ohm resistor to switch between using the built in regulator or the external one. (update: done)
• Perhaps add power indicator LED?
• Different color RX and TX?
• Find part number of correctly angled dupont connectors.
• Design and print a case (Not something I have a use for, so I won't do this)
• Might want to add USB ESD protection?

Notes:

The chip selection of FT230XQ-R is not the cheapest option, but it is a nice reliable chip, and has a very small footprint. I am open to and looking for cheaper alternatives to reduce cost of this device.