Overview: I2c

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

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).

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.

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

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 (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. The master pulls the SDA line low while SCL remains high

The master sends the 7-bit unique address of the target slave, followed by a R/W bit (0 for write, 1 for read).