I2c Overview -

I2C (Inter-Integrated Circuit), often pronounced "eye-squared-see" or "eye-two-see," is a popular, synchronous, multi-master/multi-slave communication protocol invented in 1982 by Philips Semiconductors (now NXP). It is used for short-distance, intra-board communication between a processor and low-speed peripherals such as sensors, LCDs, and memory chips. Its hallmark is using only two wires for communication, making it highly efficient for managing multiple devices on a single bus.

Uses a Serial Data Line ( SDA ) and a Serial Clock Line ( SCL ).

Multiple masters can control the same slave, and multiple slaves can reside on the same bus.

SDA and SCL are connected to a voltage source via pull-up resistors, allowing devices to pull the lines low without creating short circuits.

The master releases the SDA line to high while SCL is high, signaling the end of transmission. Advantages and Limitations Understanding I2C

Data is sent in 8-bit bytes, most significant bit first, with each byte followed by an ACK/NACK bit.