diff -r 578be2adaf3e -r 307f4279f433 Adaptation/GUID-3A30DA16-ECA8-5639-A9DC-6BE2AD55420B.dita --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Adaptation/GUID-3A30DA16-ECA8-5639-A9DC-6BE2AD55420B.dita Fri Oct 15 14:32:18 2010 +0100 @@ -0,0 +1,69 @@ + + + + + +I2C Technology GuideThis topic describes the Inter Integrated Circuit (I2C) +bus technology. +
Introduction

The I2C is a serial bus technology invented by Philips. The I2C +is a multi master serial interface used by the low power peripherals +to exchange data. The I2C supports different modes of data transfer +and three commonly used modes are:

    +

  • Standard mode supports 100Kbps data transfer

    • +

  • Fast mode supports 400Kbps data transfer

    • +

  • High speed mode supports 3.4Mbps data transfer

    • +
+
Architecture

The I2C bus contains 2 bi-directional lines, a serial clock (SCL) +and serial data (SDA) lines. In the I2C bus, more than one device +could act as Master device. There can be only one master device active +at a given time. The master device initiates the communication and +slave responds to the master. The master and slave devices can be +interchanged after a data STOP signal is sent from +the master. The master device can address more than one slave at a +time.

+ I2C Bus + +

The master device can read and write data to the slave device. +The I2C bus uses 7 or 10 bit address.

+
Features

The features of the I2C bus are:

    +

  • the master device +can send and receive data from the slave device

    • +

  • the I2C bus +uses 7 or 10 bit address

    • +

  • only uses 2 +bi-directional lines for communication

    • +

  • multiple master +device can be connected to the same bus

    • +
+
Communication

The first byte from the master is used to address the slave device. +In the first byte the master sends the address and read/write signal +to the slave. There are three types of messages:

    +

  1. master just +reads data from the slave

    2. +

  2. master just +writes data to the slave

    3. +

  3. master reads +and writes data

    4. +

The communication is initiated with a start signal and completed +with a stop bit. In the third type of message the master starts the +communication with a start signal with a read or write bit to the +slave. The process continues until the master has completed the read +and write tasks. The communication is terminated with a stop signal.

+
Typical +Uses

The typical uses of I2C bus are:

    +

  • to read data +from various flash devices like EEPROM and SDRAM

    • +

  • to control LCD

    • +

  • to read real +time clock data

    • +
+ + +I2C bus specification v2-1 Jun 2000 + \ No newline at end of file