OKA-230T
OMRON
AUTOMOTIVE
ELECTRONICS
KOREA
Transmitter,RFKeylessEntrySystem
1.ConstitutionoftheRadioFrequencyKeylessEntry
Systemforvehicle
Theradiofrequencykeylessentryis asystemthatitcontrolslockingandunlockingthedoorandthe
trunkbywirelessremotecontroller.Thissystemconsistsoftwocomponents.TheTRANSMITTERisadevice
thattransmitsthesignalwhenthebuttonispressed. Thetransmissionsignal consistsofseveralsynchronous
codes,uniqueidentificationcode,securitycodeandfunctioncode.TheRECEIVERisfixedinsidethe
vehicle.Itworksintermittentlytopreventthebatteryexhaustion. Whenthereceiverdetectsthe
synchronouscode,itrunscontinuouslytoreceivethesignalscompletely.Afterreceivingthesignal,thereceiver
decideswhichoperationwillbeperformed. The user can select the following operations by pressing the
button oftheremotetransmitter.
OPERATIONACTION
LOCK lockthedoor
UNLOCK unlockthedoor
TRUNK openthetrunk
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Transmitter
f=307.9MHz
2.Operationdescription
REMOTETRANSMITTER
LED
UNLOCK
Youcanlockandunlockyourvehiclewiththeremotetransmitter.
LOCK
WhenyoupushtheLOCKbutton,allthedoorswilllock.
Youcannotlockanyofthedoorswiththeremotetransmitterifanydoorisopenorthekeyisthe
ignitionswitch.
UNLOCK
WhenyoupushtheUNLOCKbutton,allthedoorswillunlock.
Youcannotunlockanyofthedoorswiththeremotetransmitterifanydoorisopenorthekeyisinthe
ignitionswitch.
TRUNK
LOCK
TRUNK
WhenyoupushcontinuouslytheTRUNKbuttonduring0.5s,TRUNKwillopen.
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3.Specification
3.1CPU
Type
ROM
RAM
EEPROM
Clockfrequency
Clockfrequencygeneration
Package
3.2RFblock
Carrerfrequency
Frequencygeneration
Modulation
Bittransmissionrate
Bandwidth
RFoutputpower(fieldstrength)
uPD754144-xxx(4bit)
Manufacturer:NECCorporation
4096X8bit(4Kbytes)
128X4bit(64bytes)
16X8bit(16bytes)
500KHZ
CROsillation
20pinSSOP
307.9MHz
SAWresonator
FSK
1000bpsor500bps
120KHz
75.6dBV/m≤μ
3.3Others
Dimension
Weigh
Battery
OperationVoltage
OperationTemperature
56mm×35mm×11mm
21.65g
Lithiumcell(CR2032)
Manufacturer:PANASONICBatterycorporationetc.
DC3V
-20+60℃˜ ℃
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4.Features
4.1Transmissionframe
ThetransmissionbeginsimmediatelyincaseofLOCKandUNLOCKbuttonispressed,butTRUNKbutton
isbegunafter0.5s.
Thetransmissionframeconsistsofthesynchronousframeandthedataframe.Thesynchronousframe
has30synchronouscodesthatitwillbeusedforthereceivertowakeup.Thedataframeconsistsof
24bitlengthidentificationcode,16bitsecuritycodeandfunctioncode.16milliondifferentidentificationcodes
areavailable.
Thesecuritycodeisalwayschangedincaseofanyofthebuttonsispressed.Thetransmissiontimeis
typically600milliseconds.
4.2Batterysaving
Topreventthebatteryexhaustion,themicro-computerofthetransmitterisusuallyinactive.Whenthebutton
willbepressed,themicro-computerwakesupimmediatelyandjudgeswhichbuttonispressing.Thenthe
micro-computerconstructsthetransmissionframeandradiatesitfromtheantenna.Aftertransmitting,the
micro-computerswitchesstand-bymodebyitself.
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