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USB-232 is a single chip USB to asynchronous serial
interface. It greatly simplifies the connection of electronic devices to personal
computer. In addition to the standard signal lines, additional control lines have
custom-defined functionality.
USB-232 uses the Human Interface Device (HID)
USB profile. It does not require USB drivers and so is immediately plug-and-play
with present and future Windows, Linux and Mac operating systems.
USB-232 is a firmware for the PIC18F2450 and, when available,
the PIC18F14K50 microcontroller. They require only a few discrete components and
are available in 6mm2 / 4mm2 QFN packages.
• True HID plug and play - No drivers required
• No Vendor ID / Product ID registration required
• Baud rates selectable from 110 to 460K
The USB-232 strengths compared to competitors are:
• Low price
• No driver installation required
• No virtual COM port
used - software can locate HID devices directly
• No Vendor ID / Product ID registration costs
Not suitable for retrofitting to COM port legacy applications.
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14K50 pinout shown.
11 invertible auxiliary I/O pins configurable as:
• CTS, RTS, DTR, DSR, DCD and RI
• USB / Self power sense
• Configured indication
• Suspend indication
• Host application ready indication
• All-Systems-Go indication
• Tx / Rx LED drivers
• RS485 Tx Enable
• Low power indication
• Buffer empty indication
• Data send control
• Digital, analog, interrupt I/O
• Reset / Soft Detach
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