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Passive keyless entry driver has built-in immobiliser

Posted: 10 Nov 2015     Print Version  Bookmark and Share

Keywords:Atmel  passive keyless entry  immobiliser  base station  PKE 

Atmel Corp. has introduced its next-generation 4-channel passive keyless entry (PKE) coil drivers with an integrated immobiliser base station. The Atmel ATA5291 is expandable to 8 low-frequency (LF) channels and claims to be the world's most integrated passive entry coil driver.

The PKE device combines low-frequency drivers and immobiliser base station technology into a tiny QFN-49 package, essentially removing one low frequency antenna, a standalone immobiliser base station module and an external crystal/resonator. The ATA5291 allows car manufacturers to reduce their overall system cost and enables a superior out-of-band suppression to ensure a robust immobiliser operation, allowing more than 4m for the antenna harness. This extended distance gives customers the freedom to integrate it into a dedicated electronic control unit or into a body control module anywhere in the vehicle, noted Atmel.

The device promises to deliver fast current regulation loop, ensuring faster and more reliable key localisation. Targeting the car access PKE market, the ATA5291 is directly connected to the car battery to transmit a high LF signal to wake-up the key inside (or outside) of the car. The key will then send an encrypted identification number to the car via an ultra-high frequency (UHF) signal, enabling the car door to lock/unlock or the engine to start.

Atmel ATA5291

The Atmel ATA5291 combines low-frequency drivers and immobiliser base station technology into a tiny QFN-49 package, and promises to deliver fast current regulation loop.

Unlike other devices on the market, the Atmel ATA5291 features a programmable carrier shape to mitigate electromagnetic radiation (EMR), indicated Atmel. A programmable instruction buffer with flexible commands is also integrated into the device to offload tasks from the host controller and enable for the first time value-added features for the consumer such as a welcome light or walk-away locking with a longer range and reduced power consumption.

The ATA5291 features a number of diagnostic capabilities to enable a multitude of load fault detection scenario such as short to GND, short to Vbat, Open load, etc. The device also has an extended operational temperature range of -40°C to 125°C.

Samples and production quantities of the Atmel ATA5291 are available.





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