USB-I2C

Driver-free USB to synchronous serial I2C interface

USB-I2C is a single chip USB to synchronous serial I2C slave interface. It greatly simplifies the connection of personal computer to a microcontroller capable of communicating in I2C master mode. In addition to the standard 4 I2C control lines, 11 additional Virtual I/O lines have custom-defined functionality.

USB-I2C uses the Human Interface Device (HID) USB profile. It does not require USB driver installation, and so is compatible with present and future Windows, Linux and Mac operating systems.

USB-I2C is firmware for the PIC18F2455 and PIC18F14K50 microcontrollers. It requires only a few discrete components and is available 28-pin DIL and 20-pin SSOP packages.

For I2C master applications (to control I2C slave devices), our expandIO-USB product is more suitable.

• Suitable for connection to I2C master devices
• Single chip solution
• True HID plug and play - No drivers required
• USB 2.0 compatible
• Achievable data transfer rates up to 600K baud
• Max I2C clock rate 1MHz
• 32-bit serial number
• 128-byte FIFO receive buffer
• 128-byte FIFO transmit buffer
• Operating voltage 1.8V – 5V
• 11 auxiliary I/O pins, incl, 10-bit A-to-D, USB status
• VID, PID, etc specified at program time or at runtime
• PIC18LF14K50-based DIL, SSOP packages
• PIC18LF2455-based DIL, SIOC packages

5-Minute Product Training Module

USB-I2C Data Sheet

Circuit Cellar Article

USB HID products Dev Kit

USB Evaluation Board