The Pololu USB-to-serial adapter is a tiny unit that makes it easy to connect a microcontroller project to a PC. You can connect the adapter directly to a microcontroller without an RS-232-to-TTL level converter. It is USB 2.0-compatible and will work with your existing programs that interface with a serial port.
Documentation and other information
CP2102 USB-to-Serial Bridge Driver Installation (Printable PDF: cp2102_driver_installation.pdf)
CP2102 Drivers and installation instructions for Windows, Mac, and Linux. The CP2102 is used on the Pololu USB-to-Serial Adapter, the Orangutan USB Programmer, the USB 16-Servo Controller, and the Orangutan X2.