RKE (Remote Keyless Entry) is short for remote keyless entry system/remote car door switch. An RKE system allows users to lock or unlock car doors using a transmitter on a key fob. This transmitter transmits data to the car, and the user can activate the system by pressing a button on the key fob. In addition to its ability to unlock the car's brakes, RKE also serves an anti-theft function.
RKE System Composition
It consists of a receiver controller installed in the car and a transmitter carried by the user, namely a wireless remote control car door key.
Composition of RKE system
RKE working principle
The RKE system allows users to lock or unlock car doors using a transmitter on the key fob. This transmitter transmits data to the car's interior, and pressing a button on the key fob triggers the system. This wakes up the CPU inside the RKE key fob, which then sends a data stream to the radio frequency (RF) transmitter. The data stream is typically 64 to 128 bits long, including a preamble, a command code, and a rolling code. The data stream is usually transmitted at a rate of 2 kHz to 20 kHz. The modulation method is amplitude keying (ASK), primarily to extend the key fob's battery life.
RKE key and base station structure
Transceivers particularly suitable for RKE systems
Melexis' MLX72013 low-power 425MHz to 445MHz transmitter, distributed by Worldway, is particularly suitable for RKE systems. This device is housed in an 8-pin SCIC-8 package. Its 1.9V to 5.5V supply range allows the device to be powered by a single lithium-ion battery, consuming only 5nA of supply current in standby mode.
Block diagram of Worldway RF transmitter MLX72013
When transmitting Manchester-encoded data, the Worldway MLX72103 supports data transmission rates up to 40kbps, consuming 2.9mA and 5.5mA of supply current, while providing -10dBm to +10dBm output power to a 50Ω load. A crystal-based phase-locked loop generates a precise carrier frequency, allowing the receiver to use a narrower IF bandwidth, thereby increasing transmission distance.
For RKE receivers, Worldway also offers the MLX71121, a superheterodyne ASK receiver ranging from 315MHz to 915MHz. The MLX71121 is a highly integrated single-channel/dual-band RF receiver based on a double-conversion superheterodyne architecture. It can be used in conjunction with the MLX72103.
For more information on RKE solutions or to request samples, please log in to the Worldway Electronics e-commerce app. Worldway Electronics' e-commerce smart hardware innovation service platform provides engineers with comprehensive technical support and a high-quality service experience.
Block diagram of Worldway RF receiver MLX71121
About Shih-Chiang
Founded in 1993, Worldway Advanced Semiconductor is a major distributor in Greater China for globally renowned semiconductor companies and test and measurement instrument companies, including Silicon Labs, Renesas Electronics, Rogers, Melexis, Alliance, Littelfuse, EPSON, Vincotech, Wima, Power Integrations, Shindengen, SMI, TT Electronics, Ricoh Microelectronics, and Keysight. It is also a key supplier to numerous electronics manufacturing and R&D companies. In addition to covering traditional industrial, communications, consumer, and automotive electronics sectors, its product portfolio brings cutting-edge technologies and innovative products to emerging markets such as the Internet of Things (IoT), connected vehicles, wearable devices, and smart mobile terminals.
As a technology-driven distribution company, Worldway also boasts a mature technical support team and systematic service processes, providing customers with professional services tailored to their needs, including new product introductions, rapid sampling, application consulting, solution and software design, development environments, after-sales support, and logistics. Worldway has 17 offices and a subsidiary, Xinhua Long, across China, employing 650 people.
On January 11, 2016, the Worldway Components e-commerce O2O smart hardware innovation service platform was launched, which will provide engineers with comprehensive technical support and a high-quality service experience.
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