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. I2C Overview
The master sends the 7-bit unique address of the target slave, followed by a R/W bit (0 for write, 1 for read). Each slave device has a unique 7-bit (or
The master pulls the SDA line low while SCL remains high. most significant bit first
Data is sent in 8-bit bytes, most significant bit first, with each byte followed by an ACK/NACK bit.