Omron Automotive Electronics Korea OKA-674T RF Keyless Entry System (Transmitter) User Manual LD 2F950

Omron Automotive Electronics Korea Co., Ltd. RF Keyless Entry System (Transmitter) LD 2F950

Users Manual

OKA-674T 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 ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,3 4. Specification ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 4 5. Features ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5 6. PCB ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,6 6.1 Circuit diagram ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,6 6.2 Parts layout ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 7 6.3 Parts list ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 10 7. Photographs ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,11Operation GuideCaution ! This device complies with part 15 of the FCC Rules.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 ACTIONLOCK lock the doorUNLOCK unlock the doorPANIC alarm the hornTRUNK open the trunk 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. TRUNK When you push the TRUNK button, trunk will open.
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 TRUNK and 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.

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