USB to Serial Interface by MAX213
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USB to serial interface is based on the powerful FT232 chip from FTDI. It enables very easy connection of the user’s application to the PC via the USB port, without necessity of any deep knowledge about the complicated USB problems. FT232 chip is capable to transfer data at speeds up to 1M Baud in RS232 mode and up to 3M Baud in the RS485 mode. Schematic contains the on-board serial EEPROM (93LC46) for storing the ID data (VID, PID, serial number and description strings).
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http://electronics-diy.com/electronic_schematic.php?id=566
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