Omron Automotive Electronics Korea OKA-672T RF Keyless Entry System (Transmitter) User Manual LD 2F900
Omron Automotive Electronics Korea Co., Ltd. RF Keyless Entry System (Transmitter) LD 2F900
Users Manual
OKA-672T
Transmitter, RF Keyless Entry System
OMRON AUTOMOTIVE
ELECTRONICS KOREA
Table of contents
1. Constitution of the Radio Frequency Keyless Entry system Controllerfor vehicle ,,,,, 1
2. User's manual (provisionally) ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
2
3. Block diagram ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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4. Specification ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
4
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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Operation Guide
Caution !
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.
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 TRANSMITTER is a device that
transmits 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 completely. After receiving the signal, the receiver decides which
operation will be performed. The user can selectthe following operations by pressing the button of the remote
transmitter.
OPERATION ACTION
LOCK lock the door
UNLOCK unlock the door
PANIC alarm the horn
Transmitter
f = 315.1MHz
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.
PANIC
When you push the PANIC button, horn will alarm.
LOCK
UNLOCK
PANIC
(??)
3. Block diagram
This is block diagram concerning to the transmitter
figure 3.1 block diagram of the transmitter
4.19MHz 9.846876MHz
4. Specification
4.1 CPU
Type uPD789860-xxx(8bit)
Manufacturer : NEC Corporation
ROM 4 Kbytes
RAM 128 bytes
EEPROM 32 bytes
Clock frequency 4.19MHz
Clock frequency generation X-TAL OSCILATION
Package 20pin SSOP
4.2 RF block
Carrer frequency 315.1MHz
Frequency generation X-TAL
Modulation FSK
Bit transmission rate 500bps or 1000bps
Bandwidth 120KHz
RF output power (field strength)
≤75dBuV/m
4.3 Others
Dimension 62mm×34mm×15mm
Weigh 23g
Battery Lithium cell (CR2032)
Manufacturer : PANASONIC Battery corporation etc.
Operation Voltage DC3V
Operation Temperature -20℃～+60℃
5.Features
5.1 Transmission frame
The transmission begins immediately in case of LOCK and UNLOCK button is pressed.
but Panic buttonis begun after 0.5s
The transmission frame consists of the synchronous frame and the data frame. The synchronous frame
has 320bit 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 4bit function code and 8bit crc code. 16million
different identification codes are available.
The security code is always changed in case of any of the buttons is pressed. The transmission time is
typically 300 milliseconds.
5.2 Battery saving
To prevent the battery exhaustion , the micro-computer of the transmitter is usually inactive. When the
button will be pressed, the micro-computer wakes up immediately and judges which button is pressing.
Then the micro-computer constructs the transmission frame and radiates it from the antenna .After trans-
mitting, the micro-computer switches stand-by mode by itself.