The master pulls the SDA line low while SCL remains high.
Uses a Serial Data Line ( SDA ) and a Serial Clock Line ( SCL ). I2C Overview
I2C communication is master-controlled. The master initiates, manages, and terminates communication, generating the clock signal. The master pulls the SDA line low while SCL remains high
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. Its hallmark is using only two wires for
Each slave device has a unique 7-bit (or 10-bit) address, eliminating the need for complex Chip Select (CS) lines used in SPI.
Data is sent in 8-bit bytes, most significant bit first, with each byte followed by an ACK/NACK bit.
SDA and SCL are connected to a voltage source via pull-up resistors, allowing devices to pull the lines low without creating short circuits.