Atmel Automotive Solutions for Car Access Applications

A driver pressing a button on the key fob sends an RF message to lock or unlock the car. This RF link must be reliable and have good noise immunity. The key fob transmitter must comply with local regulations. It should have security implemented by a rolling code and AES encryption. It should use very little current to give long battery life. The RF link might have a fixed frequency or be multi-channel. The link can be one-way from the fob to the car, or a bi-directional two-way exchange.

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
  • Highly integrated solutions typically integrate an Atmel microcontroller and result in small package size
  • Efficient RF designs operate down to 1.9V and consume only minimal current which extend battery life not only in key fob but in vehicle, too
  • Industry leading RF receiver sensitivity and blocking performance ensure robust RF link and consistent RF communication between fob and vehicle

Atmel Products

Key Fob ComponentsDescription
ATA5771CUHF ASK/FSK 868-928MHz Transmitter with ATtiny44V Microcontroller
ATA5773CUHF ASK/FSK 310-350MHz Transmitter with ATtiny44V Microcontroller
ATA5774CUHF ASK/FSK 429-439MHz Transmitter with ATtiny44V Microcontroller
ATA5831Low-power RF Transceiver for RKE, PEG, RS and TPMS Systems. Firmware Included in ROM, Additional Flash Option
ATA5832Ready-to-use Low-power RF Transceiver for RKE, PEG, RS and TPMS Systems
ATA5833Cost-optimized RF Transceiver for RKE, PEG, RS and TPMS Systems
Car Side ComponentsDescription
ATA5781Low-power RF Receiver for RKE, PEG, RS and TPMS Systems. Ready-to-use RF Receiver with Integrated Firmware for RKE, PEG, RS and TPMS Systems
ATA5782

Low-power RF Receiver for RKE, PEG, RS and TPMS Systems. Firmware Included in ROM, Additional Flash Option

ATA5783Low-power RF Receiver for RKE, PEG, RS and TPMS Systems. Cost-optimized Version of ATA5782, where customer software is ROM masked
ATA5831Low-power RF Transceiver for RKE, PEG, RS and TPMS Systems. Firmware Included in ROM, Additional Flash Option
ATA5832Ready-to-use Low-power RF Transceiver for RKE, PEG, RS and TPMS Systems
ATA5833Cost-optimized RF Transceiver for RKE, PEG, RS and TPMS Systems

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