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Car access keys have evolved radically from the simple steel key to today's role as the human interface to the car. High security is a must for car access applications, and is also required by insurance companies worldwide.

Remote Keyless Entry (RKE) systems combined with immobilizers are standard in nearly all cars today. Passive Entry/Go (PEG) applications offer the ultimate convenience for car users, and are well-established in current luxury vehicles. As consumers demand additional convenience, these features are increasingly making their way into medium-class cars. To meet these demands, developers need cost-efficient electronic system solutions that support a high level of integration.

Atmel® introduced its first dedicated car access transmitter in 1997, and continues to recognize the importance of automotive security. We offer a wide range of car access devices that are ideal for developing complete system solutions with the highest levels of security and convenience, supporting remote keyless entry, immobilizer, passive entry/go or combi key applications.

Features and Benefits

  • Atmel provides a complete line of ICs (RF, LF, Atmel AVR® microcontrollers) to create complete car access and remote start systems
  • Broad product scope includes dedicated RF transmitters, receivers and transceivers, as well as microcontrollers
  • Support for open standard Advanced Encryption Standard (AES) algorithm provides robust security
Car Access Diagram


Atmel enables a uni-directional RF link for the keyless entry function to open or lock the doors. The immobilizer system is built with a bi-directional LF link operating with the AUT64 crypto algorithm.

Car Access2 Diagram


Atmel supports a bi-directional RF link for the RKE function as well as for the extremely secure duplex RF link in a Passive Entry Go system. The lF link is used for the wake- up channel in a PEG system as well as for the immobilizer function to start the RF communication.

Atmel Products

Key SideCar Side
Key Components
Car Components

Learn more about the Atmel solution Application Notes, Devices, and Tools and Software