WIRELESS

Car Access System

Car Access System is a system designed to permit or deny access to premises. Advanced in microelectronics and RF technologies have improved security functions and featured new capabilities such as automatic vehicle tracking and window roll-up/down. Currently, the technologies most widely and successfully applied in these systems are RKE and PKE. RKE (Remote Keyless Entry) controls car doors and trunk lids by sending wireless signal when users press the buttons on keyfobs. While PKE (Passive Keyless Entry), which can be regarded as advanced RKE, allows users open car doors just by directly pulling door handles without the need to press any button.

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A typical RKE system has a wireless transmitter (operating at 315 MHz or 433.92 MHz), a MCU embedded in the car keys to realize control over cars. The MCU mostly stays in sleep mode in order to save power. When a button on car keys is pressed, MCU wakes up and controls transmitter to send out a 64-bit or 128-bit data stream after carrier modulation. The data is received by a RF receiver installed in cars and passed on to another MCU which verifies sender’s identity and gives instructions to control mechanism to open doors. The keyfobs with multiple buttons can provide several other functions such as opening trunks and starting engine.

Comparing with RKE systems, PKE has an additional pair of low-frequency (125 KHz) transmitter and receiver which are installed respectively in cars and keyfobs. When users carrying a PKE key pull a door handle of a car, the low-frequency transmitter in car is activated instantly and sends out a signal. The receiver embedded in keyfob receives that signal with a 3-dimentional antenna and makes a comparison between the signal and its stored data. If they match, the key is awaked and sends a high-frequency (315 MHz or 433.92 MHz) signal back to the car. And if this signal is found valid, car doors will be unlocked immediately. The whole procedure only takes several milliseconds so that users will not perceive even a slight delay. Additionally, PKE can provide a good anti-theft performance by, for example, automatic locking doors, closing windows, cutting off fuel supply and power source when users carrying the key are more than 3-5 meters away from cars.

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Hover over the blocks to view recommended products for this solution:

Low power MCU for RKE or PKE.Some MCU integrate with UHF Transmitter or LF 3D analog front end.
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Low cost automotive MCU with CAN/LIN.
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315MHz or 433.92MHz UHF transmitter IC or module.

ADF7012BRUZ
ADF7012BRUZ
Analog Devices

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315MHz or 433.92MHz UHF transmitter IC or module.

ADF7012BRUZ
ADF7012BRUZ
Analog Devices

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Encryption KEELOQ encoder for RKE or PKE.


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Encryption KEELOQ decoder for RKE or PKE.


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Automotive Class CAN/LIN Transceiver

MCP2551-I/SN
MCP2551-I/SN
Microchip

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RX2A-433-64
RX2A-433-64
RADIOMETRIX
The TX2H/RX2A are 433/434MHz single-channel FM transmitter/receiver modules, capable of handling raw data rates up to 64kb/s with usable range of 500m. The Transmitter uses PLL locked to a crystal for frequency stability over a wider temperature range. The TX2A and RX2A modules will suit one-to-one and multi-node wireless links in applications including car and building security, EPOS and inventory tracking, remote industrial process monitoring and computer networking.
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MCP2515DM-BM
MCP2515DM-BM
Microchip
The MCP2515 CAN Bus Monitor Demo kit contains two boards that connect together to create a simple two node Controller Area Network (CAN) bus, which can be controlled and/or monitored via PC interface that users configure the MCP2515 registers with, and send/receive CAN messages. The board(s) can also be connected to an existing CAN bus.
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32000467
32000467
MIPOT
The 3-2000467 module is an On-Off Key transceiver operating at 433,92 MHz, with typical transmission output power of 10 mW (+10 dBm) and the receiver sensitivity reaching –100 dBm, with auxiliary pin for RF input/output to limit the current consumption.
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RCR-433-EPR
RCR-433-EPR
RADIOTRONIX
The RCR-XXX-EPR module receives On-off keyed (OOK) modulation signal and demodulated to digital signal for the next decoder stage. Local Oscillator is made of L/C structure. The module is designed specifically for unlicensed remote control and wireless security receiver operating at 315/433 MHz.
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RDF1-433
RF SOLUTIONS
The RDF1 is an FM receiver/decoder module, providing a radio system with up to four digital outputs and single serial data output when used with an RF Solutions FIREFLY or HORNET series Handheld transmitters. A system using the RDF1 can achieve up to 200m range, depending on transmission conditions. The RDF1 consists of a front end super-heterodyne receiver and an embedded microcontroller which decodes the RF string for a compatible transmitter and outputs to 4 telemetry lines and as serial data, capable of 200m range, dependant upon transmission conditions.
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MCP2515DM-PCTL
MCP2515DM-PCTL
Microchip
The MCP2515 PICtail™ Demo Board implements a simple CAN bus with two nodes; node one uses the MCP2515 Stand Alone CAN controller, node 2 uses the MCP25020 CAN I/O Expander, each utilizing one input (push button) and one output (LED). The MCP2515 node transmits its input (push button) information at regular intervals and request input (push button) information from the MCP25020 at regular intervals. An LED on each node indicates the state of the other node's push button.
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DM163015
DM163015
Microchip
The PICDEM CAN-LIN 3 Board demonstrates features of the PIC18F6680 and PIC18F8680 devices, including those of the integrated CAN module. Additionally, the board employs a LIN sub-network using PIC18F1320 and MCP201 LIN Bus.
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