USB-232

Driver-free USB to asynchronous serial UART interface

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 firmware for the PIC18LF2450 and PIC18F14K50 microcontrollers. It is available pre-programmed as a 28-pin DIL package (2450) and a 20 pin SSOP package (14K50).  

  • True HID plug and play - No drivers required
  • No Vendor ID / Product ID registration required 
  • Baud rates selectable from 110 to 460K
  • 11 invertible auxiliary I/O pins 

Competitive positioning

The USB-232 strengths compared to competitors are:

  • Low price
  • No driver installation required
  • No virtual COM port - software locates HID devices directly
  • No Vendor ID / Product ID registration costs

Not suitable for retrofitting to COM port legacy applications.

USB-232 Data Sheet

USB-232 Dev Kit

USB Evaluation Board 

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