PL2303RA provides a convenient solution for connecting an RS232 full-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. Full compliance with the USB Specification v1.1. Customers can design with effective BOM cost and compact PCB size. PL2303HXD integrates on-chip clock generator and OTP ROM to save external crystal and EEPROM. Flexible signal level requirement on the RS-232 serial port side also allows the PL2303HXD to connect directly to 3.3V 1.8V devices. A software tool called 'EEPROM Writer Program' is available to program this EEPROM through the PL2303 itself, but I cannot find this tool anywhere. The problem is that no information is available about the contents of this EEPROM. If an external EEPROM is connected, a custom VID/PID can be set.
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