OMRON AUTOMOTIVE ELECTRONICS KOREA OKA-230T Transmitter, RF Keyless Entry System
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 remotecontroller. This system consists oftwocomponents.The TRANSMITTER i s a d e v i c e that transmits the signalwhenthebuttonispressed. The transmission signal consists of several synchronous codes , unique identification code , security code and function code. The RECEIVER is fixed inside the vehicle.
2. Operation description REMOTE TRANSMITTER LED TRUNK UNLOCK LOCK 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. Specification 3.1 CPU Type uPD754144-xxx(4bit) Manufacturer : NEC Corporation ROM 4096 X 8bit(4 Kbytes) RAM 128 X 4bit(64 bytes) EEPROM 16 X 8bit(16 bytes) Clock frequency 500KHZ Clock frequency generation CR Osillation Package 20pin SSOP 3.2 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) ≤ 75.6 dBμV/m 3.3 Others Dimension 56mm×35mm×11mm Weigh 21.
4.Features 4.1 Transmission frame The transmission begins immediately in case of LOCK and UNLOCK button is pressed, but TRUNK button is begun after 0.5s. The transmission 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 identificationcode,16bit security code and function code. 16million different identification codes are available.
