OKA-640T
OMRON
AUTOMOTIVE
ELECTRONICS
KOREA
Transmitter,RFKeylessEntrySystem
1.ConstitutionoftheRadioFrequencyKeylessEntry
Systemforvehicle
Theradiofrequencykeylessentryisasystemthatitcontrolslockingandunlockingthedoorbywireless
remotecontroller.Thissystemconsistsoftwocomponents.TheTRANSMITTERisadevicethattransmits
thesignalwhenthebuttonispressed.Thetransmissionsignalconsistsofseveralsynchronouscodes,
uniqueidentificationcode,securitycodeandfunctioncode.TheRECEIVERisfixedinsidethevehicle.
Itworksintermittentlytopreventthebatteryexhaustion.Whenthereceiverdetectsthesynchronouscode,
itrunscontinuouslytoreceivethesignalscompletely.Afterreceivingthesignal,thereceiverdecideswhich
operationwillbeperformed.Theusercanselectthefollowingoperationsbypressingthebuttonof
theremotetransmitter.
OPERATIONACTION
LOCK lockthedoor
UNLOCK unlockthedoor
-2-
Transmitter
f=307.90MHz
2.Operation
REMOTETRANSMITTER
UNLOCK
Youcanlockandunlockyourvehiclewiththeremotetransmitter.
LOCK
WhenyoupushtheLOCKbutton,allthedoorswilllock.
Youcannotlockanyofthedoorswiththeremotetransmitterifanydoorisopenorthekeyisthe
ignitionswitch.
LED
LOCK
UNLOCK
WhenyoupushtheUNLOCKbutton,allthedoorswillunlock.
Youcannotunlockanyofthedoorswiththeremotetransmitterifanydoorisopenorthekeyisinthe
ignitionswitch.
-3-
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
4096×8bit(4Kbytes)
128×4bit
16×8bit
500KHz
CROsillation
20pinSSOP
307.90MHz
SAWresonator
FSK
1000bpsor500bps
120KHz
75.6dBV/m≤μ
3.3Others
Dimension
Weigh
Battery
OperationVoltage
OperationTemperature
52.5mm×33mm×11mm
18.67g
Lithiumcell(CR2032)
Manufacturer:PANASONICBatterycorporationetc.
DC3V
-20+60℃˜ ℃
-4-
4.Features
4.1Transmissionframe
ThetransmissionbeginsimmediatelyincaseofLOCKandUNLOCKbuttonispressed.
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.
-5-
Loading...