OMRON AUTOMOTIVE ELECTRONICS KOREA OKA-240T 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 ..........................
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 t h e 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 t h e vehicle.
2. User's manual (provisionally) REMOTE TRANSMITTER UNLOCK PANIC 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 t h e 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 LOCK UNLCOK 8BIT CPU PANIC TRANSMISSION EEPROM RF CIRCUIT SAW Resonator 308 MHz CRYSTAL 4.19 MHz figure 3.
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 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 100KHz RF output power (field strength) 5000μ V/m at 3m 4.3 Others Dimension 56mm×35mm×11mm Weigh 22.
5.Features 5.1 Transmission frame The transmission begins immediately in case of LOCK and UNLOCK and PANIC button is pressed. 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 identification code, 16bit security code and function code. 16million different identification codes are available.
