We use the Silicon Labs CP2102 USB-to-UART Bridge Controller in several of our products to provide USB connectivity while communicating via a simple serial protocol.
Suppoerted Operating Systems:
Windows 7/8/8.1/10 (v6.7.3)
Windows XP/Server 2003/Vista/7/8/8.1 (v6.7)
Windows 2K (v6.3a)
WinCE
Macintosh OSX (v4)
Linux
Android