Omron Automotive Electronics Korea OKA-330T 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-330T
Transmitter, RF Keyless Entry System
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
5. Features ...................................................................................................................... 5
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 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.
OPERATION ACTION
LOCK lock the door
UNLOCK unlock the door
TRUNK open the trunk
PANIC alarm the horn
Transmitter
f = 313.85MHz
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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 continuously the PANIC button during 0.5s, horn will alarm.
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3. Block diagram
This is block diagram concerning to the transmitter
figure 3.1 block diagram of the transmitter
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TRANSM ITION
RF CIRCUIT
8 BIT
CPU
EEPRO M
LOCK
UNL O C K
TRUN
PANIC
4.19 M Hz
9.807813M Hz
4. Specification
4.1 CPU
Type
ROM
RAM
EEPROM
Clock frequency
Clock frequency generation
Package
uPD789860-xxx(8bit)
Manufacturer : NEC Corporation
4Kbytes
128 bytes
32 bytes
4.19MHz
X-TAL
20pin SSOP
4.2 RF block
Carrer frequency
Frequency generation
Modulation
Bit transmission rate
Bandwidth
RF output power (field strength)
313.85MHz
X-TAL
FSK
500bps or 1000bps
10KHz
4000 V/m at 3mμ
4.3 Others
Dimension
Weigh
Battery
Operation Voltage
Operation Temperature
62.0mm×33.7mm×14.3mm
21.5g
Lithium cell (CR2032)
Manufacturer : PANASONIC Battery corporation etc.
DC3V
-20 +60℃～ ℃
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5.Features
5.1 Transmission frame
The transmission begins immediately in case of LOCK and UNLOCK, TRUNK and PANIC is 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. Thetransmissiontimeistypically
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 transmitting, the
micro-computer switches stand-by mode by itself.
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