What is I2C ?

Inter-Integrated Circuit

• It is a synchronous mode of communication.
• As it synchronous so the the communication between two devices id based on a common signal called serial clock pulse, and master have the control of this serial clock pulse.
• It uses 2 wire bus
1. SCL : Serial Clock      ( controls communication ) 
2. SDA : Serial Data Access  ( serial data transmission bus)
• It follows many master many slaves.
• It is address oriented communication, as every slave has a unique address.
• Max no of slaves are limited to 2^7 (2 raise to power 7).
• It is half duple mode of communication.
• While transmitting data, MSB is sent first.