iC-LV
5ꢀBITꢁOPTOꢁENCODER
RevꢁA3,ꢁPageꢁ2/12
DESCRIPTION
iCꢀLVꢁisꢁanꢁoptoelectronicꢁencoderꢁICꢁforꢁabsoluteꢁlinearꢁandꢁangleꢁmeasuringꢁsystemsꢁsuchꢁasꢁglassꢁscales
andꢁshaftꢁencoders,ꢁforꢁexample.ꢁPhotosensors,ꢁamplifiersꢁandꢁcomparatorsꢁforꢁ5ꢁtracksꢁatꢁaꢁpitchꢁofꢁ600ꢁꢂm
andꢁaꢁreferenceꢁphotosensorꢁoperatingꢁtheꢁLEDꢁpowerꢁcontrolꢁareꢁmonolithicallyꢁintegratedꢁonꢁtheꢁchip.
Theꢁinternalꢁcomparatorꢁoutputsꢁswitchꢁtoꢁhighꢁwhenꢁtheꢁamplifiedꢁphotocurrentsꢁexceedꢁaꢁgivenꢁthreshold
(constantꢁlightꢁevaluation).ꢁThisꢁthresholdꢁcanꢁbeꢁadjustedꢁusingꢁanꢁexternalꢁresistorꢁatꢁRSET;ꢁalternatively,
ifꢁRSETꢁisꢁnotꢁwiredꢁanꢁinternalꢁresistorꢁisꢁused.
TheꢁinternalꢁorꢁexternalꢁresistorꢁalsoꢁestablishesꢁaꢁsetpointꢁforꢁtheꢁLEDꢁcurrentꢁcontrolꢁwhichꢁirrespectiveꢁof
temperatureꢁorꢁtheꢁeffectsꢁofꢁagingꢁkeepsꢁtheꢁopticalꢁreceiveꢁpowerꢁconstant.ꢁAꢁdriverꢁstageꢁenablesꢁeitherꢁa
transmittingꢁLEDꢁwithꢁaꢁseriesꢁresistorꢁtoꢁbeꢁdirectlyꢁconnectedꢁtoꢁtheꢁdeviceꢁorꢁoperatesꢁanꢁexternalꢁtransistor
toꢁgenerateꢁhigherꢁcurrents.
Trackꢁinformationꢁcanꢁbeꢁreadꢁoutꢁinꢁparallelꢁ(eitherꢁinꢁGrayꢁorꢁbinaryꢁcode)ꢁorꢁseriallyꢁviaꢁanꢁSSIꢁprotocol.
Here,ꢁanyꢁnumberꢁofꢁiCꢀLVsꢁcanꢁbeꢁcascadedꢁandꢁsynchronizedꢁwithꢁoneꢁanother;ꢁdataꢁisꢁthenꢁoutputꢁasꢁa
binaryꢁwordꢁ(requiringꢁGrayꢁcodeꢁdiscs).
AꢁwatchdogꢁgeneratesꢁanꢁalarmꢁmessageꢁviaꢁtheꢁerrorꢁoutputꢁifꢁtheꢁLEDꢁcurrentꢁcontrolꢁrangeꢁisꢁexceeded.
Theꢁopenꢀdrainꢁerrorꢁoutputꢁcanꢁbeꢁwiredꢁtoꢁaꢁbus;ꢁtheꢁsignalꢁisꢁthenꢁlowꢁactive.ꢁTheꢁserialꢁdataꢁoutputꢁcan
alsoꢁbeꢁcomplementedꢁbyꢁtheꢁerrorꢁbit.
AllꢁinputsꢁandꢁoutputsꢁareꢁprotectedꢁagainstꢁdestructionꢁbyꢁESD.ꢁTwoꢁdifferentꢁtestꢁmodesꢁcanꢁbeꢁselectedꢁby
pinꢁandꢁpermitꢁaꢁcompleteꢁtestꢁofꢁfunctionsꢁwithꢁtheꢁexceptionꢁofꢁtheꢁphotosensors.
CHIP LAYOUT
PAD DESCRIPTION
Name
Function
RC
RCꢁNetworkꢁforꢁSSIꢁMonoflopꢁ(wiringꢁisꢁoptional)
D0
D1
D2
D3
D4
RC
SEEN
SYNM1
SYNM0
SCLK
SERIN
SOUT
GND
VCCA
VDD
LVCC
+4...+5.5ꢁVꢁAnalogꢁSupplyꢁVoltage
+4...+5.5ꢁVꢁDigitalꢁSupplyꢁVoltage
+4...+5.5ꢁVꢁLEDꢁDriverꢁSupplyꢁVoltage
VCCA
VDD
NINV
BitꢀwiseꢁInversionꢁInputꢁ(lowꢁactive)
OperatingꢁModeꢁSelectionꢁInput
TestꢁModeꢁEnableꢁInputꢁ(highꢁactive)
LEDꢁPowerꢁControlꢁAdjustmentꢁ(wiringꢁisꢁoptional)
ErrorꢁOutputꢁ(lowꢁactive)
LVCC
MODE
TEST
RSET
NERR
NDIR
NINV
ReversalꢁofꢁRotationꢁDir.ꢁInputꢁ(lowꢁactive)
MODE
TEST
SEEN
SYNM1
SYNM0
SerialꢁErrorꢁBitꢁEnableꢁInputꢁ(highꢁactive)
SynchronisationꢁModeꢁInputꢁ/ꢁDataꢁOutputꢁD0
SynchronisationꢁModeꢁInputꢁ/ꢁDataꢁOutputꢁD1
RSET
NERR
NDIR
SCLK
SERIN
SOUT
ClockꢁInputꢁ(SSI)ꢁ/ꢁDataꢁOutputꢁD2
SerialꢁDataꢁInputꢁ(SSI)ꢁ/ꢁDataꢁOutputꢁD3
SerialꢁDataꢁOutputꢁ(SSI)ꢁ/ꢁDataꢁOutputꢁD4
AGND
LED
GND
AGND
LED
DigitalꢁGround
AnalogꢁGround
LEDꢁPowerꢁControlꢁOutputꢁ(highꢀsideꢁcurrentꢁsource)
DREF
ICHAUS [ IC-HAUS GMBH ]
