The document discusses the I2C protocol, which uses just two bidirectional serial data lines (SDA and SCL) to allow multiple devices to communicate on the same bus. It supports synchronous communication at various speeds up to 5 Mbps. Devices are addressed using 7- or 10-bit addresses. Data is transferred in bytes, with start and stop conditions defining the beginning and end of each transmission. All data transitions must occur when the clock signal SCL is low.

1. I2C PROTOCOL
(TUTORIAL)

2.  I2C = Inter IC = Inter Integrated Circuit
 Developed by Philips semiconductor (Now NXP)
 Two serial wire:
1.serial data(SDA)
2.serial clock(SCL)
 Since dedicated SCL and SDA it support synchronous
communication
 Bidirectional data transfer (not simultaneously)
Introduction

3.  Multi master support
 Byte oriented transfer(byte)
 Wide range of Bus speed
1.Standard mode = 100 kbps
2.Fast mode = 400 kbps
3.High speed mode = 1 mbps
4.High speed mode = 3.4 mbps
5.Ultra fast mode = 5 mbps
Contd………

4. Signal definition

7. Operation

8.  All the transition from 0 to 1 or 1 to 0,the should happen
only when clk is low..
 As the start and stop condition is defined when clk is
high ,so all the data transition shroud happen only when
clk is low.
 So that receiving device could sample its pin ,when clk is
high.
 So when clk is high the data line will be stable.
 Lets say we want to transmit 0xAA = 1010 1010
 So msb bit goes frist
RULES

9.  Star condition
In start condition master send 1 byte in which (8 bit)
So first 7 bit is slave device address and 8th bit is define its read
or write operation
If 8th bit 0 = write operation
If 8th bit 1 = read operation
After start condition master continuously send data or receive
data.
 Stop condition
 Note- i2c will send 1 byte at a time on 7 bit address line or 10
bit address line.
R/D and W/R operation

10. Termination of operation

11.  https://drive.google.com/file/d/0BwDvWYgN9s0cTHl5
WlppcFItaEE/view?usp=sharing
For more detail refer bellow
document