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 ).
Data is sent in 8-bit bytes, most significant bit first, with each byte followed by an ACK/NACK bit. I2C Overview
The master pulls the SDA line low while SCL remains high.
Multiple masters can control the same slave, and multiple slaves can reside on the same bus. Uses a Serial Data Line ( SDA )
I2C communication is master-controlled. The master initiates, manages, and terminates communication, generating the clock signal.
The master releases the SDA line to high while SCL is high, signaling the end of transmission. Advantages and Limitations Understanding I2C Multiple masters can control the same slave, and
The slave device with the matching address responds with an Acknowledge (ACK) bit (low), signaling it is ready, or a Not Acknowledge (NACK) bit (high).