Omron Automotive Electronics Korea OKA-642T RF Keyless Entry System (Transmitter) User Manual
Omron Automotive Electronics Korea Co., Ltd. RF Keyless Entry System (Transmitter) Users Manual
Users Manual
OMRON
AUTOMOTIVE ELECTRONICS
KOREA
OKA-642T
Transmitter, RF Keyless Entry System
▣ Table of contents
1. Constitution of the RF Keyless Entry system Controllerfor vehicle ,,,,,,,,,,,,, 1
2. User's manual (provisionally) ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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3. Block diagram ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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4. Specification ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,
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5. Features ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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6. PCB ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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6.1 Circuit diagram ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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6.2 Parts layout ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,
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6.3 Parts list ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,
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7. Photographs ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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This device complies with part 15 of the FCC Rules. Operation
is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received,
including interference that may cause undesired operation.
Caution :
Any changes or modifications to the equipment not expressly approved
by the party responsible
for compliance could void user’s authority to operate the equipment.
1. Constitution of the Radio Frequency Keyless Entry System for vehicle
The radio frequency keyless entry is a system that it controls locking and unlocking the door and
the trunk by wireless remote controller. This system consists of three components. The TRANSMI
-TTER is a device thattransmits the signal when the button is pressed. The transmission signal
consists of several synchronous codes, unique identification code, security code and function code
The RECEIVER is fixed inside the vehicle.It works intermittently to prevent the battery exhaustion.
When the receiver detects the synchronous code, it runs continuously to receive the signals co
- mpletely. After receiving the signal, the receiver decides which operation will be performed. The
remoteuser can select the following operations by pressing the button of the transmitter.
OPERATION ACTION
LOCK lock the door
UNLOCK
unlock the door
Transmitter
f = 307.9MHz
2. User's manual (provisionally)
◎ REMOTE TRANSMITTER
You can lock and unlock your vehicle with the remote transmitter.
LOCK
When you push the LOCK button, all the doors will lock.
You cannot lock any of the doors with the remote transmitter if any door is open or the key
is the ignition switch.
UNLOCK
When you push the UNLOCK button, all the doors will unlock.
You cannot unlock any of the doors with the remote transmitter if any door is open or the
key is in the ignition switch.
3. Block diagram
This is block diagram concerning to the transmitter
figure 3.1 block diagram of the transmitter
308MHz
4. Specification
4.1 CPU
Type uPD754144-xxx(4bit)
Manufacturer : NEC Corporation
ROM 4096 * 8bit (4 Kbytes)
RAM 128 bytes * 4bit
EEPROM 16 bytes * 8bit
Clock frequency 500KHz
Clock frequency generation CRYSTAL Osillation
Package 20pin SSOP
4.2 RF block
Carrer frequency 307.9MHz
Frequency generation SAW resonator
Modulation FSK
Bit transmission rate 1000bps or 500bps
Bandwidth 120KHz
RF output power(field strength) 4000uV at 3m
4.3 Others
Dimension 52.5mm×33mm×11mm
Weigh 18.67g
Battery Lithium cell (CR2032)
Manufacturer : PANASONIC Battery corporation etc.
Operation Voltage DC3V, 5mA
Operation Temperature -20℃～+60℃
5. Features
5.1 Transmission frame
The transmission begins immediately in case of LOCK and UNLOCK button is pressed.
The transmission frame consists of the synchronous frame and the data frame. The synchr
-onous frame has 30 synchronous codes that it will be used for the receiver to wake up.
The data frame consists of 24bit length identification code,16bit security code and func
tion code. 16million different identification codes are available.
The security code is always changed in case of any of the buttons is pressed. The tran
smission time is typically 640 milliseconds.
5.2 Battery saving
To prevent the battery exhaustion , the micro-computer of the transmitter is usually ina
ctive. When the button will be pressed, the micro-computer wakes up immediately and ju
dges which button is pressing. Then the micro-computer constructs the transmission frame
and radiates it from the antenna .After transmitting, the micro-computer switches stand-by
mode by itself.