Overview | I2c

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

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.

SDA and SCL are connected to a voltage source via pull-up resistors, allowing devices to pull the lines low without creating short circuits. I2C Overview

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).

The master pulls the SDA line low while SCL remains high. Uses a Serial Data Line ( SDA )

Each slave device has a unique 7-bit (or 10-bit) address, eliminating the need for complex Chip Select (CS) lines used in SPI.

Multiple masters can control the same slave, and multiple slaves can reside on the same bus. Its hallmark is using only two wires for

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