Where can I get more information on the I2C bus? Two excellent sources of information on the I2C bus are: The I2C Peripherals Data Handbook (IC12) available from Philips Semiconductors. The I2C Bus, From Theory to Practice, from Dominique Paret with Carl Fenger, ISBN 0-471-96268-6, published by John Wiley & Sons.  The PC-I2C-KIT is really just an enhanced version of the OM4777 (single master controller) mentioned in this book.  The FDI version adds several new features, including on-board programming of I2C EEPROM's, and we also provide full Windows software support.