I²C
I²C is a multi-master protocol that uses 2 signal lines. The two I²C signals are called ‘serial data’
(SDA) and ‘serial clock’ (SCL). There is no need of chip select (slave select) or arbitration logic.
Virtually any number of slaves and any number of masters can be connected onto these 2 signal
lines and communicate between each other using a protocol that defines: