OKA-320T
OMRON
AUTOMOTIVE
ELECTRONICS
KOREA
Transmitter,RFKeylessEntrySystem
1.ConstitutionoftheRadioFrequencyKeylessEntry
Systemforvehicle
Theradiofrequencykeylessentryis asystemthatitcontrolslockingandunlockingthedoorandalarm
thehornbywirelessremotecontroller.Thissystemconsistsofthreecomponents.TheTRANSMITTERisa
devicethattransmitsthesignalwhenthebuttonispressed. Thetransmissionsignal consistsofseveral
synchronouscodes,uniqueidentificationcode,securitycodeandfunctioncode.TheRECEIVERisfixedinside
thevehicle.Itworksintermittentlytopreventthebatteryexhaustion. Whenthereceiverdetectsthe
synchronouscode,itrunscontinuouslytoreceivethesignalscompletely.Afterreceivingthesignal,thereceiver
decideswhichoperationwillbeperformed. The user can select the following operations by pressing the
button oftheremotetransmitter.
OPERATIONACTION
LOCK lockthedoor
UNLOCK unlockthedoor
PANIC alarmthehorn
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Transmitter
f=313.85MHz
2.Operation
REMOTETRANSMITTER
Youcanlockandunlockyourvehiclewiththeremotetransmitter.
LED
LOCK
UNLOCK
PANIC
LOCK
WhenyoupushtheLOCKbutton,allthedoorswilllock.
Youcannotlockanyofthedoorswiththeremotetransmitterifanydoorisopenorthekeyisthe
ignitionswitch.
UNLOCK
WhenyoupushtheUNLOCKbutton,allthedoorswillunlock.
Youcannotunlockanyofthedoorswiththeremotetransmitterifanydoorisopenorthekeyisinthe
ignitionswitch.
PANIC
WhenyoupushthePANICbutton,hornwillalarm.
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3.Specification
3.1CPU
Type
ROM
RAM
EEPROM
Clockfrequency
Clockfrequencygeneration
Package
3.2RFblock
Carrerfrequency
Frequencygeneration
Modulation
Bittransmissionrate
Bandwidth
RFoutputpower(fieldstrength)
uPD789860-xxx(8bit)
Manufacturer:NECCorporation
4Kbytes
128bytes
32bytes
4.19MHz
CRYSTALOsillation
20pinSSOP
313.85MHz
CRYSTALOSILLATION
FSK
1000bpsor500bps
120KHz
<75.55dBuV/mat3m
3.3Others
Dimension
Weigh
Battery
OperationVoltage
OperationTemperature
62mm(H)×34mm(W)×15mm(T)
23g
Lithiumcell(CR2032)
Manufacturer:PANASONICBatterycorporationetc.
DC3V,10mA
-20+60℃˜ ℃
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4.Features
4.1Transmissionframe
ThetransmissionbeginsimmediatelyincaseofLOCKandUNLOCKandPANICbuttonispressed.
Thetransmissionframeconsistsofthesynchronousframeandthedataframe.Thesynchronousframe
has30synchronouscodesthatitwillbeusedforthereceivertowakeup.Thedataframeconsistsof
24bitlengthidentificationcode,16bitsecuritycodeandfunctioncode.16milliondifferentidentificationcodes
areavailable.
Thesecuritycodeisalwayschangedincaseofanyofthebuttonsispressed.Thetransmissiontimeis
typically300milliseconds.
4.2Batterysaving
Topreventthebatteryexhaustion,themicro-computerofthetransmitterisusuallyinactive.Whenthebutton
willbepressed,themicro-computerwakesupimmediatelyandjudgeswhichbuttonispressing.Thenthe
micro-computerconstructsthetransmissionframeandradiatesitfromtheantenna.Aftertransmitting,the
micro-computerswitchesstand-bymodebyitself.
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