参数资料
型号: ADJD-S311-CR999
厂商: Avago Technologies Ltd.
英文描述: Miniature Surface Mount RGB Digital Color Sensor
中文描述: 微型表面贴装RGB数字色彩传感器
文件页数: 17/20页
文件大小: 389K
代理商: ADJD-S311-CR999
6
Serial Interface Reference
S
START condition
P
STOP condition
SDA
SCL
Description
TheprogramminginterfacetotheADJD-S311isa2-wireserialbus.Thebusconsistsofaserialclock(SCL)andaserial
data(SDA)line.TheSDAlineisbi-directionalonADJD-S311andmustbeconnectedthroughapull-upresistortothe
positivepowersupply.Whenthebusisfree,bothlinesareHIGH.
The2-wireserialbusonADJD-S311requiresonedevicetoactasamasterwhileallotherdevicesmustbeslaves.A
masterisadevicethatinitiatesadatatransferonthebus,generatestheclocksignalandterminatesthedatatransfer
whileadeviceaddressedbythemasteriscalledaslave.Slavesareidentifiedbyuniquedeviceaddresses.
Bothmasterandslavecanactasatransmitterorareceiverbutthemastercontrolsthedirectionfordatatransfer.A
transmitterisadevicethatsendsdatatothebusandareceiverisadevicethatreceivesdatafromthebus.
TheADJD-S311serialbusinterfacealwaysoperatesasaslavetransceiverwithadatatransferrateofupto100kbit/s.
START/STOP Condition
The master initiates and terminates all serial data transfers.To begin a serial data transfer, the master must send a
uniquesignaltothebuscalledaSTARTcondition.ThisisdefinedasaHIGHtoLOWtransitionontheSDAlinewhile
SCLisHIGH.
ThemasterterminatestheserialdatatransferbysendinganotheruniquesignaltothebuscalledaSTOPcondition.
ThisisdefinedasaLOWtoHIGHtransitionontheSDAlinewhileSCLisHIGH.
ThebusisconsideredtobebusyafteraSTART(S)condition.ItwillbeconsideredfreeacertaintimeaftertheSTOP(P)
condition.ThebusstaysbusyifarepeatedSTART(Sr)issentinsteadofaSTOPcondition.
TheSTARTandrepeatedSTARTconditionsarefunctionallyidentical.Seefigure3.
Figure 3. START/STOP Condition
Figure 4. Data Bit Transfer
SDA
SCL
Data valid
Data change
Data Transfer
ThemasterinitiatesdatatransferafteraSTARTcondition.Dataistransferredinbitswiththemastergeneratingone
clockpulseforeachbitsent.Foradatabittobevalid,theSDAdatalinemustbestableduringtheHIGHperiodofthe
SCLclockline.OnlyduringtheLOWperiodoftheSCLclocklinecantheSDAdatalinechangestatetoeitherHIGHor
LOW.
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