FT-X series devices offer lower power, lower pin count, and a leadership feature set, that makes bridging from a USB ports to UART, I2C, enhanced SPI (FT1248) or FIFO interfaces  easy to design and implement.

FT200XD Full Speed USB to I2C Bridge in 10 pin DFN package

FT201X Full Speed USB to I2C Bridge

FT220X Full Speed USB to 4-Bit SPI / FT1248 Bridge

FT221X Full Speed USB to 8-bit SPI / FT1248 Bridge

FT230X Full Speed USB to Basic UART

FT231X Full Speed USB to Full Handshake UART

FT234XD Full Speed USB to Basic UART

FT240X Full Speed USB to 8- bit FIFO