Understand the I²C (I2C, TWI) bus

This video explains how the I²C bus works.

00:00 Introduction
00:30 Alternative name (Twi, Two-wire interface)
00:57 General architecture of the bus
02:27 Components' roles on the bus (master or slave)
04:20 Protocol: the requests on the bus
08:20 Protocol: write and read requests
09:22 Keeping control of the bus between two requests
10:17 How electronic components use the bus
13:10 Physical layer: SDA and SCL
15:25 Physical layer: start signal and bits transfer (0 and 1)
18:04 Physical layer: the stop signal
19:35 Physical layer: the restart signal
20:45 Data and signals sum up (start signal, bit transfert (0 and 1), stop signal, restart signal)
23:30 Outro

[davidbriggs]

Very thorough explanation, and great graphics/animations.