The CP2108 is a highly integrated USB-to-Quad UART Bridge Controller providing a simple solution for updating RS-232/RS-485 designs to USB using a minimum of components and PCB space. The CP2108 includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM and four asynchronous serial data buses (UART) with full modem control signals in a compact 9mm x 9mm 64-pin QFN. The on-chip EEPROM may be used to customize the USB Vendor ID (VID), Product ID (PID), product description string, power descriptor, device release number, interface strings, device serial number, modem and GPIO configuration as desired for OEM applications. The EEPROM is programmed on-board via the USB, allowing the programming step to be easily integrated into the product manufacturing and testing process. An evaluation kit for the CP2108 (Part Number: CP2108EK) is available. It includes a CP2108-based USB-to-UART/RS-232 evaluation board, a complete set of VCP device drivers, USB and RS-232 cables and full documentation.