AN10216-01 I2C Manual INTEGRATED CI RCUITS APPLICATION NOTE AN10216-01 I2C MANUAL Abstract – The I2C Manual provides a broad overview of the various serial buses, why the I2C bus should be considered, technical detail of the I2C bus and how it works, previous limitations/solutions, comparison to the SMBus, Intelligent Platform Management Interface implementations, review of the different I2C devices that are available and patent/royalty information. The I2C Manual was presented during the 3 hour TecForum at DesignCon 2003 in San Jose, CA on 27 January 2003. Jean-Marc Irazabal – I2C Technical Marketing Manager Steve Blozis – I2C International Product Manager Specialty Logic Product Line Logic Product Group Philips Semiconductors March 24, 2003 1 AN10216-01 I2C Manual TABLE OF CONTENTS TABLE OF CONTENTS...................................................................................................................................................2 OVERVIEW .......................................................................................................................................................................4 DESCRIPTION.....................................................................................................................................................................4 SERIAL BUS OVERVIEW...............................................................................................................................................4 UART OVERVIEW.............................................................................................................................................................6 SPI OVERVIEW..................................................................................................................................................................6 CAN OVERVIEW ...............................................................................................................................................................7 USB OVERVIEW................................................................................................................................................................9 1394 OVERVIEW .............................................................................................................................................................10 2 I C OVERVIEW ................................................................................................................................................................11 SERIAL BUS COMPARISON SUMMARY .............................................................................................................................12 2 I C THEORY OF OPERATION ....................................................................................................................................13 2 I C BUS TERMINOLOGY...................................................................................................................................................13 START AND STOP CONDITIONS ....................................................................................................................................14 HARDWARE CONFIGURATION ...............................................................................................................................14 BUS COMMUNICATION.............................................................................................................................................14 TERMINOLOGY FOR BUS TRANSFER ................................................................................................................................15 2 I C DESIGNER BENEFITS .................................................................................................................................................17 2 I C MANUFACTURERS BENEFITS.....................................................................................................................................17 OVERCOMING PREVIOUS LIMITATIONS .............................................................................................................18 ADDRESS CONFLICTS ......................................................................................................................................................18 CAPACITIVE LOADING > 400 PF (ISOLATION) .................................................................................................................19 VOLTAGE LEVEL TRANSLATION .....................................................................................................................................20 2 INCREASE I C BUS RELIABILITY (SLAVE DEVICES).........................................................................................................21 2 INCREASING I C BUS RELIABILITY (MASTER DEVICES)..................................................................................................22 CAPACITIVE LOADING > 400 PF (BUFFER)......................................................................................................................22 2 LIVE INSERTION INTO THE I C BUS .................................................................................................................................24 2 LONG I C BUS LENGTHS .................................................................................................................................................25 2 PARALLEL TO I C BUS CONTROLLER ..............................................................................................................................25 DEVELOPMENT TOOLS AND EVALUATION BOARD OVERVIEW..................................................................26 2 PURPOSE OF THE DEVELOPMENT TOOL AND I C EVALUATION BOARD...........................................................................26 WIN-I2CNT SCREEN EXAMPLES.....................................................................................................................................28 HOW TO ORDER THE I2C 2002-1A EVALUATION KIT .....................................................................................................31 2 COMPARISON OF I C WITH SMBUS........................................................................................................................31 2 I C/SMBUS COMPLIANCY ...............................................................................................................................................31 DIFFERENCES SMBUS 1.0 AND SMBUS 2.0 ....................................................................................................................32 INTELLIGENT PLATFORM MANAGEMENT INTERFACE (IPMI) ....................................................................32 INTEL SERVER MANAGEMENT.........................................................................................................................................33 PICMG ...........................................................................................................................................................................33 VMEBUS.........................................................................................................................................................................34 2 I C DEVICE OVERVIEW..............................................................................................................................................35 TV RECEPTION................................................................................................................................................................36 RADIO RECEPTION ..........................................................................................................................................................36 2 AN10216-01 I2C Manual AUDIO PROCESSING ........................................................................................................................................................37 DUAL TONE MULTI-FREQUENCY (DTMF)......................................................................................................................37 LCD DISPLAY DRIVER....................................................................................................................................................37 LIGHT SENSOR ................................................................................................................................................................38 REAL TIME CLOCK/CALENDAR .......................................................................................................................................38 GENERAL PURPOSE I/O EXPANDERS ...............................................................................................................................38 LED DIMMERS AND BLINKERS .......................................................................................................................................40 DIP SWITCH....................................................................................................................................................................42 MULTIPLEXERS AND SWITCHES.......................................................................................................................................43 VOLTAGE LEVEL TRANSLATORS.....................................................................................................................................45 BUS REPEATERS AND HUBS ............................................................................................................................................45