Custom 328p + FT231X board - can't get USB programming working - Product Design - Arduino Forum
usb - Can't receive any data from FT231X - Electrical Engineering Stack Exchange
GitHub - DeuxVis/FT231X_breakout: Breakout board for the FT231X USB to serial converter from FTDI.
FT232R USB UART IC Datasheet. Version 2.16. 10 Alternative Parts. FT232R. FT234X. FT23. FT231X. FT232H. Description. USB Speed. UART Data - Datasheet FT232R FTDI, Revision: 2.16
USB to Serial Adapter - Thunderlinx [THX-1000] - $65.00 : RS232, RS485, RS422, USB and other Serial converters