I2C总线协议规范 v2.1.pdf

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1、THEI2C-BUSSPECIFICATIONVERSION2.1JANUARY2000PhilipsSemiconductorsTheI2C-busspecificationCONTENTS13.4Hs-modedevicesatlowerspeedmodes..2413.5Mixedspeedmodesononeserialbus1PREFACE...........................3system............................241.1Version1.0-1992....................313.5.

2、1F/S-modetransferinamixed-speedbus1.2Version2.0-198.....................3system............................251.3Version2.1-1999....................313.5.2Hs-modetransferinamixed-speedbus1.4PurchaseofPhilipsI2C-buscomponents..3system............................25213.5.3Timingrequireme

3、ntsforthebridgeina2THEIC-BUSBENEFITSDESIGNERSmixed-speedbussystem..............27ANDMANUFACTURERS...............41410-BITADDRESSING................272.1Designerbenefits....................42.2Manufacturerbenefits.................614.1Definitionofbitsinthefirsttwobytes.....27214.2Form

4、atswith10-bitaddresses..........273INTRODUCTIONTOTHEIC-BUS14.3GeneralcalladdressandstartbytewithSPECIFICATION.....................610-bitaddressing....................304THEI2C-BUSCONCEPT...............615ELECTRICALSPECIFICATIONS5GENERALCHARACTERISTICS.........8ANDTIMINGFORI/OSTAGES6

5、BITTRANSFER......................8ANDBUSLINES....................306.1Datavalidity........................815.1Standard-andFast-modedevices.......306.2STARTandSTOPconditions...........915.2Hs-modedevices....................347TRANSFERRINGDATA...............1016ELECTRICALCONNECTIONSOF

6、I2C-BUSDEVICESTOTHEBUSLINES.377.1Byteformat........................107.2Acknowledge.......................1016.1Maximumandminimumvaluesof8ARBITRATIONANDCLOCKresistorsRpandRsforStandard-modeI2C-busdevices.....................39GENERATION......................1117APPLICATIONINFORMATION

7、.........418.1Synchronization....................118.2Arbitration.........................1217.1Slope-controlledoutputstagesof8.3UseoftheclocksynchronizingFast-modeI2C-busdevices............41mechanismasahandshake...........1317.2Switchedpull-upcircuitforFast-modeI2C-busdevices......

8、............