Omron Automotive Electronics Korea OKA-220T RF Keyless Entry System User Manual MANUAL AND BLOCK DIAGRAM

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Document ID	70038
Application ID	cujwQdHH813J2Of2rfvMog==
Document Description	MANUAL AND BLOCK DIAGRAM
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	2.63kB (32873 bits)
Date Submitted	1999-11-16 00:00:00
Date Available	1999-12-28 00:00:00
Creation Date	2001-05-17 15:58:02
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-05-17 15:58:02
Document Title	MANUAL AND BLOCK DIAGRAM

OMRON
AUTOMOTIVE
ELECTRONICS
KOREA
OKA-220T
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
1. Constitution of the Radio Frequency Keyless Entry System for vehicle
The radio frequency keyless entry is a system that it controlls 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
sychronous code, it runs continuously to receive the signals completely. After receiveing the signal, the receiver decides which
operation will be performed. The user can select the following operations by pressing the button of theremote transmitter.
OPERATION
LOCK
UNLOCK
TRUNK
ACTION
lock the door
unlock the door
open the door
-1-
2. User's manual (provisionally)
REMOTE TRANSMITTER
You can lock and unlock and open the trunk 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 the TRUNK button, Door of trunk will open.
-2-
3. Block diagram
This is block diagram concerning to the transmitter
figure 3.1 block diagram of the transmitter
-3-
4. Specification
4.1 CPU
Type
uPD754144-xxx(4bit)
Manufacturer : NEC Corporation
ROM
4096 x 8bit(4kbytes)
RAM
128 x 4bit
EEPROM
16 x 8bit
Clock frequency
500KHz
4.2 RF block
Carrer frequency
307.9MHz
Frequency generation
SAW resonator
Modulation
FSK
Bit transmission rate
100bps or 500bps
Bandwidth
120KHz
4.3 Others
Dimension
55mm x 34mm x 11mm
Weigh
22.5g
Battery
Lithium cell (CR2032)
Manufacturer: PARASONIC Battery corporation etc.
Operation Voltage
DC3V, 10mA
Operation Temperature
-20
+60
-4-
5.Features
5.1 Transmission frame
The transmission begins immediately in case of LOCK or UNLOCK or TRUNK button is pressed.
The transmisssion frame consists of the synchronous frame and the data frame. The synchronous 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 function code. 16million different identification codes are available.
The security code is always changed in case of any of the buttins is pressed. The transmission time is typically 600 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.
INFORMATION TO THE USER
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
WARNING
Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the
equipment.
-5-

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Create Date                     : 2001:05:17 15:58:02
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