PR5201-XX [PREMA]
Incremental Sensor IC for Optical Encoders with additional reticle for highest flexibility;
| 型号： | PR5201-XX |
| 厂家： | 
Prema |
| 描述： | Incremental Sensor IC for Optical Encoders with additional reticle for highest flexibility |
| 文件： | 总16页 (文件大小：2235K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EncoderICPR5201-XX
IncrementalSensorICforOpticalEncoders
withadditionalreticleforhighestflexibility
For higher flexibility at lower production
volumes, PR5201usesareticletoadaptthe
photodiodes of the encoder IC to different
resolutionsofA,BandZchannelanddifferent
trackradii.
FEATURES
• sharpZchannelpulse,generatedbyan
innovativemethod
• A/Bchannelresolutionfrom100tomorethan
10,000
APPLICATIONS
• adaptabletodifferenttrackradii
• ungatedandgatedZchannel
(synchronisationwithA/Bchannel)
• rotationdirectionindicator
•incrementalrotaryencoders
•linearscales
• outputwith4-foldpulsedensity,triggeredat
eachAorBphasechange
• LEDcurrentcontrolusingareferencechannel
andalarmforinsufficientlightintensitydue
toageingLED
•Chip-on-boardorQFNpackageforflexible
useforinawiderangeofapplications
•widetemperaturerange(-40°...125°C)for
operationinroughenvironments
BLOCKDIAGRAM
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EncoderICPR5201-XX
DifferentPackagingSolutionsforIndividualRequirements
PACKAGES
ThePR5201isofferedwith3packagingsolutionstomeetindividualrequirements.PREMASemiconductor
GmbHdeliverstheincrementalencoderICasbaredice,onmodified/standardPCBsorinQFNpackages
suitablefordifferentmaximumtemperatures.
a)ICasbaredice–PR5201-BD
c)QFN-32L5x5–PR5201-TM
EncoderICscanbedeliveredasbaredices
(2.245µmx3.285µm)ontestedandinked
wafers,orsingulateddicesonadhesivefilm
TheQFNpackageconsistsoftransparentmold
compoundonly.
b)Chip-on-board–PR5201-CB
d)QFN-32L5x5–PR5201-OC
PR5201-CBaremountedonPCBs(standard/
customized).Aspecialassemblytechnique
allowsaquickassemblyofthereticle.
Apre-moldedQFNpackagewithaspecial
transparentfillermaterialthatissuitablefor
operationupto125°Cambienttemperature.
ABSOLUTEMAXIMUMRATINGS
Parameter
Min Typ Max Units
V (supplyvoltage)
-0.3
-0.3
14 V
CC
V (voltage@otherpins)
PIN
V +0.3 V
CC
OperatingTemperature
PR5201-BD/OC -40
PR5201-CB/TM -40
125 °C
85 °C
StorageTemperatureRange
PR5201-BD/OC -55
PR5201-CB/TM -40
150 °C
100 °C
T (JunctionTemperature)
J
PR5201-BD/OC -40
PR5201-CB/TM -40
150 °C
100 °C
ElectrostaticDischarge(ESD)Protection@allpins
4
kV
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EncoderICPR5201-XX
ElectricalCharacteristics
V =5V,T=-40...125°C(unlessotherwisenoted)
CC
J
Symbol
Parameter
Supplyvoltage
Conditions Min Typ Max Units
V
cc
3
6 V
mA
I
CC
Supplycurrent(noload)
digitaloutputsLO
digitaloutputsHI
Tj=27°C
2.7
2.5
DigitaloutputsA,B,Z,C4,RL,Alarm
f
OUT
Outputfrequency
A,B
C4,RL,Alarm
300 kHz
1200 kHz
V (Lo)
SaturationvoltageLO
Short-circuitcurrentLO
SaturationvoltageHI
Short-circuitcurrentHI
I=1.3mA
0.3 V
16 mA
1 V
Sat
I (Lo)
SC
V=V
2
CC
V (Hi)
Sat
I=1.3mA
V=0V
I (Hi)
SC
-14
-1,6 mA
f Quantisationfrequencyof4xpulses
OSC
1.2 2 2.8 MHz
t
Widthof4xpulse
Delayof4xpulse
200
500
350
600
500 ns
2000 ns
700 ns
1500 ns
4xW
t
4xD
t
AW
Widthofalarm-pulse
Delaytimeofalarm-pulse
t
4D
Programmingpinmode_C4
mode_C4Lostatevoltage
mode_C4Histatevoltage
V
0
0.3 V
Vcc V
kOhm
Lo
V
Hi
Vcc-0.3
R mode_C4permissibleloadforopen toVccorVcc 500
open
ProgrammingpinsM0,M1,M2
V
Lostatevoltage
0
0.3 V
kOhm
Lo
R
open
permissibleloadforHi
toVee
500
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EncoderICPR5201-XX
ElectricalCharacteristics
V =5V,T=-40...125°C(unlessotherwisenoted)
CC
J
Symbol
Parameter
Conditions Min Typ Max Units
TestcircuitinputsT,TnA,TnB,TnZ
Notestmodeactivated
V
TP
-0.3
0.3 V
Photosensors
λar
Spectralapplicationrange Se(λar)=0.25*λpk 500
950 nm
nm
λpeak
Peaksensitivity
800
30
LEDCurrentControl
I
LED
LEDcurrentcontrolrange
Short-circuitcurrent
V@pinLED=2V 15
mA
mA
I
SC
V@pinLED=V
CC
Tj=27°C
Testpinsareusedforchiptestonly.Theiruseisnotfurtherdescribedinthisdocument.
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EncoderICPR5201-XX
Photodiodes–SizesandLocations
Sizesandlocationsofphotodiodesareindicatedinthediagrambelow.
Remarks:
• A,AandB,BarethelocationsofAandBchannelphotodiodes,respectively.
• ZandZarethelocationsoftheZchannelphotodiodes
• Refisthereferencechannelphotodiodetomeasuretheilluminationonthechip.
• Fisfiducialmarkingforeasieralignmentofthephotodiode.(Itisnotaphotodiode.)
• Thecrossesmarkthecentresofthephotodiodes.
• Diedimensionsaretakenfromthecentreofscribeline.
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EncoderICPR5201-XX
ZPulseGatingModesG0-G6
TogetherwithareticleassembledontopofPR5201,therotatingcodediskproducesatimesequenceof
brightanddarkpatternsonthephotosensorsA,A,BandB.PR5201amplifiesthedifferentialsignals
fromphotodiodesAandA,andBandB,respectively.
Theoutputsignalisformedfromthedifferentialsignalsbymeansofacomparator.
WhiletheAandBoutputsareperiodicandideallyhaveaphaseshiftof90°againsteachother,theZ
signalisusedasanindexpulsethatoccursonceperrevolution.
mode M0 M1 M2 condition pulsewidth
ZPULSEGATINGMODESG0-G6
3
1
G0 Hi Hi Hi ungated /...1/T
4
2
TopreventthevariationoftheZ-pulselength,it
canbesynchronized(“gated”)withtheAandB
channelinsixdifferentmodesG1...G6.
Inaddition,theungatedsignalisavailablein
modeG0.
1
G1 Lo Hi Hi Z A B /T
4
1
G2 Hi Lo Hi Z A B /T
4
Themodeselectionismadethroughathreebit
selector,byconnectingtheM0,M1andM2pins
eitherwithVee(Lo)orleavingthemopen(Hi).
Thefollowingdiagramshowsallgatingmodes
incomparison,andhowtheyaresetthrough
M0,M1andM2pins.
1
G3 Lo Lo Hi Z A B /T
4
1
G4 Hi Hi Lo Z A /T
2
1
G5 Lo Hi Lo Z B /T
2
1
G6 Hi Lo Lo Z A B /T
4
EXAMPLEFORSELECTINGGATINGMODEG1
M0=Lo,M1=Hi,M2=Hi
Remark:InmodeG6,aproperZpulseisachieved
onlywithadiskwithdifferentphasebetweenZand
A/Bpatternthanshownintheupperpartofthis
image.
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EncoderICPR5201-XX
MODEG0
Programming:M0=Hi,M1=Hi,M2=Hi
Zsignallogiccombination:ungated
1
Z pulse width: typically 3/ T...1/ T, depending on
4
2
opticaladjustmentandresolution.
MODEG1
Programming:M0=Lo,M1=Hi,M2=Hi
Zsignallogiccombination:Z A B
1
Zpulsewidth:/ T
4
MODEG2
Programming:M0=Hi,M1=Lo,M2=Hi
Zsignallogiccombination:Z A B
1
Zpulsewidth:/ T
4
MODEG3
Programming:M0=Lo,M1=Lo,M2=Hi
Zsignallogiccombination:Z A B
1
Zpulsewidth:/ T
4
MODEG4
Programming:M0=Hi,M1=Hi,M2=Lo
Zsignallogiccombination:Z A
1
Zpulsewidth:/ T
2
MODEG5
Programming:M0=Lo,M1=Hi,M2=Lo
Zsignallogiccombination:Z B
1
Zpulsewidth:/ T
2
MODEG6
Programming:M0=Hi,M1=Lo,M2=Lo
Zsignallogiccombination:Z A B
1
Zpulsewidth:/ T
4
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EncoderICPR5201-XX
UsingRLandC4Signals
Foreasierusewithsomedigitalsystems,PR5201offersanalternativesetofoutputsignals.Inaddition
toAandBsignals,itprovidesaclocksignal4xthatcomeswitheveryT/4period,plusaninformation
indicatingthedirectionofrotation.
4xPULSES
4x pulses are triggered with each rising or
fallingedgeofAorBchannel;hencetheirfre-
quencyisfourtimesthefrequencyofAorB.
E.g.acodediscwith2048linesperrevolution
produces81924xpulsesperrevolution.
UnlikeA,BandZ,4xpulseshaveafixedlength, Duetothesynchronisation,the4xpulsecan
independent of the rotation frequency. The
imageontheleftillustratesonetypical4xpulse
(magenta),whichistypically300nslong.
jitter within one quantisation period. In the
exampleshownontheleft,theminimumdelay
is730ns,themaximumis1170ns.
4xpulsesarenotsynchronisedwiththeAorB
Ifathighspeedsthepulsesequencebecomes
edges,butwithaninternalclock(see“quantisa- toofasttoberesolved, theAlarmoutputis
tionfrequency”).Thiscausesadelaybetween
thetriggeringeventandthe4xpulse.
activated(seechapter“Alarmpin”.)
MODE_C4SETTING
mode_C4 Directionof Signal Signalat
connectto rotation atC4-pinRL-pin
OtherthanAandB,4xalonedoesnotcontain
informationaboutthedirectionofrotation.This
makesitnecessarytoprovidethisstatusina
differentway.
open AfollowsB 4x Lo
open BfollowsA 4x Hi
Forcompatibilitywithdifferentdigitalsystems,
thesesignalscanbeprovidedinthreedifferent
waysatpinsC4andRL,selectablethroughthe
mode_C4pin.
The mode can be set by connecting the
mode_C4pineithertoVcc, Vee, orleavingit
open.
Vcc
Vcc
Vee
Vee
AfollowsB 4x Hi
BfollowsA Hi 4x
AfollowsB Hi Lo
BfollowsA Hi Hi
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EncoderICPR5201-XX
MODE_C4=OPEN
C4pinprovidesthe4xsignal.
RL=Loif"AfollowsB"
RL=Hiif"BfollowsA"
Toavoiderraticsignalsforanencoderjittering
around a static position, the RL signal is
changedonlyafterthesecondedgeinthenew
direction.4xpulsesresumeonlyafterthenext
phasechangeafterRLhaschangeditsstatus.
Whenusing4xtocounttheabsoluteposition,
thetwoskippedpulsescauseanoffsetbytwo
digitsbetweenaleftturningandarightturning
encoder.Ifneeded,thisoffsetmaybecorrected
bythesoftwareofthecounter.
1(yellow): A
3(magenta):C4 4(green): RL
2(blue): B
AstheRLphasechangeissynchronizedwith
theinternalclock,theremaybeanadditional
delaytime.
MODE_C4=Vcc
Thismodeisprovidedforsystemsexpectingup
anddowncountingsignalsatdifferentinputs.
If“AfollowsB”,4xisobtainedattheC4pin,and
theRLpinisHi.
If“BfollowsA”,4xisobtainedattheRLpin,and
theC4pinisHi
Similartothedetaileddescriptionabove,there
isanabsoluteoffsetoftwodigitsbetweenleft
andrightturningencoders.
MODE_C4=Vee
In this mode, the logic state of RL (green)
indicates the sense of rotation, while C4
(magenta)isunusedandalwaysHi.
Incontrasttothemodesdescribedabove,the
senseofdirectionisindicatedimmediately,asit
isnotsynchronizedwiththequantisationclock.
4xsignalsarenotavailableinthismode,which
isintendedfordirectevalutationofAandB
signals.
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EncoderICPR5201-XX
AlarmSignal
TheAlarmpinisactivatedintwocases:
a) illuminationlevelatreferencephotodiodetoolow
b) rotationspeedtoohighfor4xpulsestoberesolved
Thischapteronlydealswithcondition(b).
IftherotationspeedissohighthatAandB
signalschangewithinthesamequantisation
cycle(<700ns),resultinginmissing4xpulses,
PR5201triggerstheAlarmpin.Thescreenshot
showsanalarm-pulseduetoasimultaneous
A/Bphasechange.Thepulseistypically500ns
long.AsAlarmissynchronizedwiththeinternal
clock, the delay to the triggering event can
vary,butisabout1.1µsinthisexample.
Here,tworisingandtwofallingedgesoftheA
andBsignals(yellowandblue)aretooclose
together,causingfouralarmpulses(green).For
each quantisation period in which an error
occurs,onealarmpulseisissued.
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EncoderICPR5201-XX
LEDCurrentRegulation
PR5201 uses a reference photodiode to
measuretheilluminanceonthechip.
INCREASINGTHELEDCURRENT
Throughtheintegratedlinearcurrentregulator,
this signal can be used to control the LED
currenttobeattheminimumlevelneededfor
properoperation,independentofLEDageing.
TheLEDcurrentneededdependsontheLED
beam diameter, efficiency, wavelength, and
other parameters. Typically LED currents of
5...12mAwillsufficeforahigh-efficiencyLED
with4mmbeamdiameter.
LEDALARM
TheAlarmpingoesHiiftheilluminanceofthe
Refphotodiodefallsbelowathreshold.
Thethresholdcanbeinfluencedbythewidthof
anapertureovertheRefdiode,whichispartof
thereticlemountedontopofthepackage.
TheLEDsignalishighaslongasthefailure
conditionpersists.
TheAlarmsignalcanbeusedinconnectionwith
theinternalLEDcurrentregulationorwithfixed
LEDcurrent.
Especially at low supply voltage and when
using LEDs with high forward voltage, the
currentdrivenbyPR5201maybeinsufficient.
Inthiscaseaconstantcurrentcanbeaddedto
thecurrentregulatedbyPR5201,byconnecting
aresistorbetweentheLEDpinandGnd.
Inthiscase,theLEDcurrentisgivenby:
V cc−V
I LED
=
LED +I (LED)
Rext
OutputDriverLatchupProtection
Iflongerwiresaretobeconnectedwiththe
outputsA,B,Z,C4orRL,itisrecommendedto
protecteachoutputagainstlatchupwiththe
followingcircuit:
Recommendedvaluesare:
R >50Ohm
prot
D typeSD130Borequivalent(Schottkytype)
prot
This protection is not required for internal
connectiononthesamePCB,e.g.tolinedriver
orµC.
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EncoderICPR5201-XX
QFN-32L5x5TM/OC-Pinning
Besidebaredice(BD)orchip-on-board(CB),theopticalencoderPR5201isofferedinaQFN-32L5x5
package. FordifferenttemperaturerequirementstwoQFN-32L5x5packagesareavailablewitha
transparentmoldcompound(TM)orwithanopencavity(OC)includingafillermaterial.
Bothpackages(TMandOC)arepincompatibleandusethesamefootprint.
PINDESCRIPTION
PinNo PinName PinFunctionDescription
1
2
n.c.
mode_C4
TnZ
T
donotconnect
mode_C4(C4modeselect)
+
3
TnZ(testinputZinvert)
+
4
T(testinputcompvolt)
5
M0
M0(gatingselection)
M1(gatingselection)
M2(gatingselection)
notconnected
Alarm(LEDalarm)
LED(LEDcurrentcontrol)
RL
6
M1
7
M2
8-14
15
n.c.
Alarm
LED
RL
16
QFN-32L5x5package
(viewfromtop)
17
18
Z
Z(Zpulse)
Temperaturerangesare
QFN-32L5x5OC:-40-+125°C*
QFN32L5x5TM:-40-+85°C*
*preliminaryspecification;qualificationinprogress
19
C4
C4
20
21
22
23
24
25
26-32
pad
B
B(Bchannel)
A(Achannel)
Vee
A
OCandTMtypepackageshaveamoisturesen-
sitivitylevel(MSL)of3.
Alead-freesolderprofilewithapeaktempera-
tureof260°Corless,accordingtoJ-STD-020
shouldbefollowed.
Vee
Vcc
TnA
TnB
n.c.
n.c.
Vcc
+
TnA(testinputAinvert)
+
TnB(testinputBinvert)
Samplesshippedwithoutmoisturebarrierbag
mustbedry-bakedaccordingtoJEDECguide-
linesbeforesoldering. Manualsolderingmay
notbepossibleormustbedonewithutmost
care.
notconnected
centralpadnotconnected
+ Testpinsareforchiptestonlyandnotfurther
described in this document. They should not be
connectedonthePCB.
Directinfraredheatingshouldbeavoided;pure
convectionheatingisrecommended.Thereis
noexperiencewithgasphasesoldering.
Chipcentremaybeoffsetbyupto50µmfrom
packagecentreinanydirection.
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EncoderICPR5201-XX
QFN-32L5x5TM/OC-Dimensions
Bothpackages(TMandOC)arepincompatibleandusethesamefootprint
PR5201-TM–ACOMPLETETRANSPARENTQFN-32L-5x5PACKAGE
OpticalQFNpackage32leads,5.0mmx5.0mm
PR5201-OC–OPENCAVITYQFN-32L-5x5PACKAGEWITHATRANSPARENTFILLERMATERIAL
OpenCavityPackageQFN32leads,5.0mmx5.0mm
Dimensions[mm]:
A=1.35max.
D=5.0±0.1
E=5.0±0.1
E2=3.0±0.1
e=0.50
D2=3.0±0.1
K=0.40±0.05
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EncoderICPR5201-XX
Chip-on-boardTechniqueforStandardandIndividualSolutions
ThePR5201-CBisofferedasChip-on-board.Someexistingsolutionsareonstockandcanbedelivered
withinshorttime.Forindividualapplications,printedcircuitboard(PCBs)canalsobedesignedand
produced according to your geometrical requirements for shape of the PCB and location of the
connectors.
PR5201-CB–CHIP-ON-BOARDTECHNIQUE
ThebaredieisbondedtothePCB,enclosedbyaplasticframeandcoveredbyasiliconematerial.
TheseimagesshowasamplePCBforencoderswithinnercasediameterofatleast52mm.
MOUNTINGARETICLE
Thereticlecanbebondedontopoftheframe.
Aninnovativemethodallowstoalignthereticle
againstthephotodiodesinPR5201inashort
assemblytime.
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EncoderICPR5201-XX
Notes
©PREMASemiconductorGmbH2015Irev.4715
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EncoderICPR5201-XX
Disclaimer
InformationprovidedbyPREMAisbelievedtobeaccurateandcorrect.However,noresponsibilityisassumedby
PREMAforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartieswhichmayresultfromitsuse.
PREMAreservestherightatanytimewithoutnoticetochangecircuitryandspecifications.
LifeSupportPolicy
PREMASemiconductorsproductsarenotauthorizedforuseascriticalcomponentsinlifesupportdevicesor
systemswithouttheexpresswrittenapprovalofPREMASemiconductor.Asusedherein:
1.Lifesupportdevicesorsystemsaredevicesorsystemswhich,(a)areintendedforsurgicalimplantintothebody,
or(b)supportorsustainlife,andwhosefailuretoperformwhenproperlyusedinaccordancewithinstructionsfor
useprovidedinthelabeling,canbereasonablyexpectedtoresultinasignificantinjurytotheuser.
2.Acriticalcomponentisanycomponentofalifesupportdeviceorsystemwhosefailuretoperformcanbe
reasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem,ortoaffectitssafetyoreffectiveness.
PREMASemiconductorGmbH
Robert-Bosch-Str.6
55129Mainz Germany
Phone:+49-6131-5062-0
Fax:+49-6131-5062-220
Email:prema@prema.com Website:www.prema.com
©PREMASemiconductorGmbH2015Irev.4715
Page16/16
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