iC-LV
5ꢀBITꢁOPTOꢁENCODER
RevꢁA3,ꢁPageꢁ9/12
Modes of operation
iCꢀLVꢁhasꢁvariousꢁmodesꢁofꢁoperationꢁwhichꢁareꢁpreꢀ
selectedꢁusingꢁpinꢁMODE.ꢁMODEꢁ=ꢁ0ꢁselectsꢁoperaꢀ
tionꢁasꢁanꢁoptoelectronicꢁencoderꢁICꢁwithꢁaꢁparallel
output;ꢁMODEꢁ=ꢁ1ꢁ(default)ꢁmakesꢁaꢁnumberꢁofꢁserial
operatingꢁmodesꢁavailable.
Inꢁboth No SyncꢁandꢁNo Sync BinaryꢁmodeꢁiCꢀLV
operatesꢁwithoutꢁsynchronization,ꢁi.e.ꢁitꢁstoresꢁtheꢁ5
trackꢁvaluesꢁonꢁtheꢁfirstꢁfallingꢁedgeꢁseenꢁatꢁSCLK
afterꢁaꢁlongꢁidleꢁtimeꢁandꢁthenꢁtransmitsꢁtheꢁtrackꢁdata
viaꢁpinꢁSOUTꢁonꢁeachꢁofꢁtheꢁ5ꢁfollowingꢁrisingꢁedges
atꢁSCLK.ꢁAtꢁtheꢁsameꢁtimeꢁpinꢁSERINꢁreadsꢁinꢁdata
fromꢁ aꢁ preꢀpositionedꢁ iCꢀLVꢁ whichꢁ canꢁ thenꢁ be
passedꢁon.ꢁHere,ꢁiCꢀLVꢁoperatesꢁasꢁaꢁ5ꢀbitꢁshiftꢁregisꢀ
terꢁ(orꢁ6ꢀbitꢁifꢁtheꢁerrorꢁbitꢁisꢁactiveꢁduringꢁNoꢁSync
mode)ꢁwhoseꢁflipflopsꢁacceptꢁinputꢁdataꢁonꢁaꢁfalling
edgeꢁandꢁoutputꢁstoredꢁdataꢁonꢁaꢁrisingꢁedge.
Parallel Output Mode (MODE = 0)
Inꢁparallelꢁoutputꢁmodeꢁtheꢁ5ꢁtracksꢁwithꢁsensorꢁD4
(MSB)ꢁtoꢁsensorꢁD0ꢁ(LSBꢁorꢁleastꢁsignificantꢁbit)ꢁare
outputꢁ inꢁ parallelꢁ toꢁ pinsꢁ SYNM1ꢁ (LSB),ꢁ SYNM0,
SCLK,ꢁSERINꢁandꢁSOUTꢁ(MSB).
InꢁNo Sync BinaryꢁmodeꢁdataꢁisꢁconvertedꢁfromꢁGray
toꢁbinaryꢁbeforeꢁbeingꢁoutput.ꢁInꢁthisꢁmodeꢁofꢁoperaꢀ
tionꢁitꢁisꢁnotꢁpossibleꢁtoꢁoutputꢁaꢁserialꢁerrorꢁbit;ꢁno
dataꢁfromꢁSERINꢁisꢁacceptedꢁonꢁtheꢁfirstꢁandꢁsecond
risingꢁedgeꢁatꢁSCLK.
TheꢁwiringꢁofꢁpinꢁNDIRꢁdeterminesꢁtheꢁcountꢁdirecꢀ
tion.ꢁWithꢁNDIRꢁconnectedꢁtoꢁGNDꢁtheꢁMSBꢁisꢁoutput
invertedꢁ soꢁ thatꢁ theꢁ countꢁ directionꢁ canꢁ beꢁ altered
whenꢁreadingꢁGrayꢀcodedꢁdiscs.
IfꢁpinꢁNDIRꢁisꢁconnectedꢁtoꢁGNDꢁaꢁchangeꢁinꢁcount
directionꢁwithꢁGrayꢁcodesꢁcanꢁbeꢁinitiatedꢁbyꢁinverting
theꢁMSB.ꢁByꢁconnectingꢁpinꢁNINVꢁtoꢁGNDꢁallꢁtrack
dataꢁ canꢁ beꢁ outputꢁ inverted.ꢁ Bothꢁ pinsꢁ NINVꢁ and
NDIRꢁareꢁhighꢁwhenꢁnotꢁconnected.
ByꢁconnectingꢁpinꢁNINVꢁtoꢁGNDꢁtheꢁoutputꢁofꢁallꢁbits
canꢁbeꢁinverted.ꢁIfꢁthisꢁisꢁnotꢁrequired,ꢁNINVꢁcanꢁbe
leftꢁ open.ꢁ NDIRꢁ andꢁ NINVꢁ canꢁ beꢁ usedꢁ eitherꢁ toꢀ
getherꢁorꢁindependentlyꢁofꢁoneꢁanother.ꢁIfꢁbothꢁpins
areꢁconnectedꢁtoꢁGNDꢁallꢁbitsꢁBꢁwithꢁtheꢁexceptionꢁof
theꢁMSBꢁBꢁareꢁoutputꢁinverted.
InꢁmodesꢁSSI out andꢁSync outꢁiCꢀLVꢁoperatesꢁwith
synchronization,ꢁ classingꢁ theꢁ LSBꢁ ofꢁ itsꢁ ownꢁ code
discꢁasꢁaꢁsynchronizationꢁbit.ꢁTheꢁdataꢁreadꢁinꢁfrom
theꢁcodeꢁdiscꢁisꢁconvertedꢁintoꢁbinaryꢁcodeꢁand,ꢁif
necessary,ꢁcorrectedꢁbyꢁ+1ꢁorꢁꢀ1ꢁdependingꢁonꢁthe
MSBꢁofꢁtheꢁpreꢀpositionedꢁdeviceꢁalsoꢁreadꢁin.
ByꢁconnectingꢁpinꢁSEENꢁtoꢁGNDꢁtheꢁbitsꢁcanꢁbeꢁoutꢀ
putꢁinꢁbinaryꢁformatꢁfollowingꢁaꢁGrayꢁtoꢁbinaryꢁcode
conversion.ꢁThisꢁisꢁdoneꢁafterꢁtheꢁbitsꢁhaveꢁbeenꢁinꢀ
verted,ꢁ whereꢁ relevant.ꢁ Ifꢁ pinꢁ SEENꢁ isꢁ leftꢁ unconꢀ
nectedꢁtheꢁoutputꢁisꢁinꢁGrayꢁcode.
EachꢁLSBꢁhasꢁtheꢁsameꢁresolutionꢁasꢁtheꢁMSBꢁofꢁthe
preꢀpositionedꢁ iCꢀLV,ꢁ operatedꢁ atꢁ aꢁ 16ꢀfoldꢁ faster
speed,ꢁandꢁisꢁassembledꢁsoꢁthatꢁitꢁeitherꢁtrailsꢁ(SEEN
isꢁhigh,ꢁdefault)ꢁorꢁleadsꢁ(SEENꢁisꢁlow)ꢁbyꢁupꢁtoꢁ90°.
Theꢁphaseꢁpositionꢁmustꢁbeꢁconfiguredꢁforꢁeachꢁindiꢀ
vidualꢁ codeꢁ discꢁ usingꢁ pinꢁ SEENꢁ (trail/lead).ꢁ This
phaseꢁshiftꢁappliesꢁtoꢁdataꢁconvertedꢁintoꢁbinaryꢁcode
andꢁisꢁnotꢁimmediatelyꢁvisibleꢁonꢁtheꢁcodeꢁdiscs.
Serial Output Mode (MODE = 1, default)
Inꢁ serialꢁ outputꢁ modeꢁ pinꢁ SCLKꢁ isꢁ theꢁ clockꢁ input
hookedꢁupꢁtoꢁanꢁSSIꢁmasterꢁsupplyingꢁanꢁintermitꢀ
tentlyꢁactiveꢁclockꢁsignalꢁwithꢁaꢁhighꢁlevelꢁduringꢁidle
time,ꢁpinꢁSERINꢁisꢁtheꢁserialꢁdataꢁinputꢁandꢁpinꢁSOUT
theꢁserialꢁdataꢁoutput.
Ifꢁ dataꢁ isꢁ readꢁ outꢁ seriallyꢁ andꢁ synchronizedꢁ elseꢀ
whereꢁaꢁsmallerꢁphaseꢁshiftꢁmustꢁbeꢁadjusted.ꢁInꢁthis
instanceꢁdataꢁtransmissionꢁtimesꢁmustꢁbeꢁtakenꢁinto
account.
Variousꢁserialꢁoperationalꢁmodesꢁandꢁoutputꢁformats
canꢁ beꢁ configuredꢁ usingꢁ pinsꢁ SYNM0ꢁ andꢁ SYNM1
(highꢁwhenꢁnotꢁwired).
Theꢁsynchronizationꢁprocessꢁensuresꢁthatꢁsynchroꢀ
nousꢁwithꢁtheꢁflippingꢁofꢁtheꢁMSBꢁfromꢁtheꢁpreꢀposiꢀ
tionedꢁ iCꢀLVꢁ trackꢁ dataꢁ isꢁ switchedꢁ forwardꢁ toꢁ the
nextꢁdataꢁwordꢁexpectedꢁonꢁthatꢁcodeꢁdisc.ꢁOnceꢁthe
trackꢁdataꢁhasꢁbeenꢁcapturedꢁonꢁtheꢁfirstꢁfallingꢁedge
atꢁSLCK,ꢁtheꢁdataꢁwordꢁisꢁsynchronizedꢁwithꢁtheꢁMSB
ofꢁtheꢁpredecessorꢁduringꢁtheꢁfirstꢁlowꢁandꢁfirstꢁhigh
periodꢁonꢁtheꢁSCLKꢁlineꢁ(theꢁMSBꢁisꢁpossiblyꢁsubject
toꢁchangeꢁwithinꢁthisꢁtime).
SYNM Serial Operational
(1:0) Modes
Data Output Format
1ꢁ1
1ꢁ0
0ꢁ1
0ꢁ0
NoꢁSyncꢁꢁꢁ(default)
NoꢁSyncꢁBinary
SyncꢁOut
5ꢁbitꢁGrayꢁ(option:ꢁ+1ꢁerrorꢁbit)
5ꢁbitꢁbinary
4ꢁbitꢁbinaryꢁ(correctedꢁbyꢁ±1ꢁ)
4ꢁbitꢁbinaryꢁ(correctedꢁbyꢁ±1ꢁ)
SSIꢁOut
InꢁNo SyncꢁmodeꢁanꢁLEDꢁcontrolꢁerrorꢁbitꢁ(lowꢁactive)
canꢁbeꢁaddedꢁtoꢁtheꢁserialꢁdataꢁbyꢁreleasingꢁitꢁviaꢁpin
SEEN.ꢁInꢁNo Sync BinaryꢁmodeꢁpinꢁSEENꢁhasꢁno
function.
ICHAUS [ IC-HAUS GMBH ]
