PL2303-HX SSOP28 USB to UART OverviewThe PL-2303HX is a low cost and high performance USB-to-Serial Bridge  Controller. The PL-2303HX provides a convenient solution for connecting  an RS-232 full-duplex asynchronous serial device to any Universal Serial  Bus (USB) capable host. The PL-2303HX highly compatible drivers could  simulate the traditional COM port on most operating systems allowing the  existing applications based on COM port to easily migrate and be made  USB ready. The PL-2303HX is exclusively designed for mobile and embedded  solutions in mind, providing a small footprint that could easily fit in  to any connectors and handheld devices. With very small power  consumption in either operating or suspend mode, the PL-2303HX is  perfect for bus power operation with plenty of power left for the  attached devices. Flexible signal level requirement on the RS-232 serial  port side also allows the PL-2303HX to connect directly to 3.3V ~ 1.8V  devices. PL-2303HX integrates on-chip clock generator and OTP ROM to  save external crystal and EEPROM. Customers can design with effective  BOM cost and compact PCB size. Feature:Full compliance with the USB Specification v1.1On-chip USB 1.1 transceiver and 5V3.3V regulatorSupports RS-232 serial interface with Programmable baud rate from 75 bps to 12 Mbps (Rev D)Supports RS422/RS485 interface (Rev D)Integrates on-chip Clock Generator (Rev D)On-chip OTP (One Time Programming) ROM for startup device configurations like product string and serial number string (Rev D)Extensive flow control mechanism like adjustable high/low  watermark level, automatic hardware or software flow control, and  inbound data buffer overflow detectionConfigurable 256-byte outbound buffer and 256-byte inbound buffer; or 128-byte outbound buffer and 384-byte inbound bufferSupports remote wake-up from MODEM input signalsSupports up to 8 GPIO pins (Rev D) – 4 General Purpose I/O pins & 4 Auxiliary General Purpose I/OPackage type: SSOP28 / QFN32 PL-2303 USB to Serial Bridge ControllerDatasheet