Omron Automotive Electronics Korea OKA-642T 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-642T Transmitter, RF Keyless Entry System
▣ Table of contents 1. Constitution of the RF 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 ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,11 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 approvedby the party responsiblefor 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 TRANSMI -TTER is a device thattransmits 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 co - mpletely. After receiving the signal, the receiver decides which operation will be performed. The remoteuser can select the following operations by pressing the button of the transmitter.OPERATION ACTIONLOCK lock the doorUNLOCK unlock the door Transmitter f = 307.9MHz
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.
3. Block diagram This is block diagram concerning to the transmitter figure 3.1 block diagram of the transmitter 308MHz
4. Specification 4.1 CPU Type uPD754144-xxx(4bit) Manufacturer : NEC Corporation ROM 4096 * 8bit (4 Kbytes) RAM 128 bytes * 4bit EEPROM 16 bytes * 8bit Clock frequency 500KHz Clock frequency generation CRYSTAL Osillation Package 20pin SSOP 4.2 RF block Carrer frequency 307.9MHz Frequency generation SAW resonator Modulation FSK Bit transmission rate 1000bps or 500bps Bandwidth 120KHz RF output power(field strength) 4000uV at 3m 4.3 Others Dimension 52.5mm×33mm×11mm Weigh 18.67g Battery Lithium cell (CR2032) Manufacturer : PANASONIC Battery corporation etc. Operation Voltage DC3V, 5mA Operation Temperature -20℃～+60℃
5. Features 5.1 Transmission frame The transmission begins immediately in case of LOCK and UNLOCK button is pressed. The transmission frame consists of the synchronous frame and the data frame. The synchr -onous 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 func tion code. 16million different identification codes are available. The security code is always changed in case of any of the buttons is pressed. The tran smission time is typically 640 milliseconds. 5.2 Battery saving To prevent the battery exhaustion , the micro-computer of the transmitter is usually ina ctive. When the button will be pressed, the micro-computer wakes up immediately and ju dges 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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