Bing found the following results
  1. I²C - Wikipedia

  2. I2C - SparkFun Learn

  3. Basics of the I2C Communication Protocol - Circuit Basics

  4. I2C Info – I2C Bus, Interface and Protocol

  5. I2C Communication - All about I²C with Diagrams - Seeed Studio

  6. I2C Primer – I2C Bus

  7. I2C Bus

  8. I²C - Digilent Reference