Omron Automotive Electronics OKA-325R User manual

Transmitter, RF Keyless Entry System
OMRON
AUTOMOTIVE
ELECTRONICS
KOREA
OKA- 325R

FCC Operation Statement
FCC Compliance Statement
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
(2) This device must accept any interference received, including
interference that may cause undesired operation.

Table of contents
1. Constitution of the Radio Frequency Keyless Entry system Controller
for vehicle .....………………………………………………………………………………..1
2. User's manual (provisionally) .....................................................................2
3. Block diagram ...........................................................................................3
4. Specification .............................……………………………………………………….4
4.1 CPU ………………………………………………………………………………………….4
4.2 EEPROM …………………………………………………………………………………….4
4.3 RF Receiver Module ………………………………………………………………………4
4.4 Other ……………………………………………………………………………………….. 4
5. Features .................................................................................…………..……5
5.1 Door lock control
5.2 Battery saving
6. Derivatives .................................................................................... 5
7. PCB ......................................................................................... 6
7.1 Circuit diagram ………………………………………………………………………….6
7.2 Parts layout ………………………………………………………………………… 7-10
7.3 Parts list ……………………………………………………………………………… 11-12
7.4 Connector ……………………………………………………………………………….13
7.5 Photographs …………………………………………………………………………..14-15
8. RF Module ............................................................……………….. 16
8.1 Block diagram …………………………………………………………………………..16
8.2 Circuit diagram ………………………………………………………………………….17
8.3 Parts Layout ……………………………………………………………………………..18
8.4 Part list ……………………………………………………………………………………19
9. Sticker ................................................................................................ 20
10. Antenna ...........................................................................…………………. 21

1. Constitution of the Radio Frequency Keyless Entry
System for vehicle
The radio frequency keyless entry is a s
y
stem that it controls lockin
g
and unlockin
g
the door and the
trunk and the panic 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 and crc 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 select the following operations by pressing the button of the remote transmitter.
Transmitter
f = 313.85MHz
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OPERATION ACTION
LOCK lock the door
UNLOCK unlock the door
TRUNK open the trunk
PANIC alarm the horn

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.
TRUNK
When you push continuously the TRUNK button during 0.5s, TRUNK will open.
PANIC
When you push the PANIC button, horn will alarm.
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LOCK
UNLOCK
PANIC
TRUNK

3. Block diagram
This is block diagram concerning to the receiver
- 3 -

4. Specification
4.1 CPU
4.2 EEPROM
4.3 RF Receive Module
4.4 Others
- 4 -
Type
ROM
RAM
Clock frequency
Clock frequency generation
Package
MB90F867(16bit)
Manufacturer : FUJITSU
128KByte
6KByte
4MHz
Crystal resonator
100pin QFP
Type
Memory
Package
S-93C56XXX
Manufacturer: Seiko. Elec
2Kbit
8pin SOP
Type
Local clock frequency
Frequency generation
Modulation Scheme
Bandwidth
Carrier Detect Sensitivity
G8X-21RX-KO1
Manufacturer: OMRON KOREA
313.85MHz
Crystal resonator
FM(superheterodyne)
±200 KHz
11dBuVemf
Dimension
Weigh
Battery
Operation Voltage, Current
140mm×113mm ×62mm
258g
CAR Battery(DC 12V)
DC12V,50mA (4mA on standby)
-40℃∼+80℃

5.Features
5.1 Door lock control
The LOCK relay in the receiver drives the door lock actulators to "LOCK"-side when LOCK button of
transmitter was pressed. The UNLOCK relay in the receiver drives
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 transmitting, the
micro-computer switches stand-by mode by itself.
6. Derivatives
OKA-325Ris an integrated controller for a car body control, includes the keyless entry receiver.
The integrated. controller consists of the multiple control functions as follows, centralized door lock,
turn-signal lamp, room-lamp, intermitted wiper, power window timer, ignition key illumination,
warning buzzer and so on.
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