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Remote Keyless Entry
General description
Using security transponders, car immobilizer systems provide a very effective means for theft protection. With challenge-response or mutual-authentication techniques, remote keyless entry can be added easily to immobilizer systems, providing increased customer convenience during use of the vehicle.
Background information
Pressing a button on the key to unlock the car from a couple of meters away is a standard feature on many cars today. In the past, the immobilizer function providing authorization to start the engine, worked independently from the remote access operation of the car door. NXP Semiconductors has introduced the first transponder to incorporate both functions in a single chip.
Products
NXP Semiconductors is currently shipping the HITAG2+ remote keyless entry transponder (PCF7946). It combines the proven immobilizer security features of our existing HITAG IC (PCF7936), with the comfort of remote keyless entry.
The next generation remote keyless entry transponder, the PCF7942, includes a RISC Controller architecture to extend customers capabilities by implementing customized security algorithms. A low cost version, the PCF7941, is currently under development.
Customer benefits
- Immobilizer security and Remote Keyless Entry functionality in one single chip, gives a considerable cost advantage to car manufacturers and users
- Comfort settings such as driver's preferred seat and steering-wheel position, in-car temperature and entertainment requirements, can be stored in the key
- Effective solution against car theft
- Increased user convenience