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Transceivers secure auto access

Posted: 19 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? rf transceiver ic? ata5824? ata5823?

Atmel Corp. announced the availability of its new full duplex RF transceiver ICs ATA5824 and ATA5823. These two new devices are optimized for automotive keyless entry/passive entry go (PEG) and tire pressure monitoring (TPMS) systems. They can also be used for remote control, alarm, telemetering, energy metering and home automation systems applications.

The ATA5824 and the ATA5823 provide full duplex functionality, which helps to secure RF systems against automotive theft and other unauthorized system access. In addition, the devices enable system cost reduction since in automotive applications; only one transceiver will be needed for car access plus TPMS functions instead of one transceiver for each system.

The ATA5823 is designed for 313MHz to 316MHz, whereas the ATA5824 operates at 433MHz to 435MHz and 867MHz to 870MHz. Both transceivers are pin- and functionally identical. They support data rates of 1kBaud to 20kBaud (FSK) and 1kBaud to 10kBaud (ASK) in Manchester, Bi-phase or other codes in transparent mode.

The ATA5823's and the ATA5824's current consumption is both in receive and in transmit mode as low as 10.5mA (3V/ Tx with 5dBm). This enables portable applications to be powered by a single Li-cell for smaller designs with extended lifetime.

The new transceivers' system performance demonstrates -116.5dBm sensitivity at 2.4kBaud in ASK and -109.5dBm at 2.4kBaud in FSK mode. PAE is nearly 40 percent, with adjustable output power of up to 10dBm for long-distance operation. Due to the transmitter module's closed-loop Fractional-N synthesizer, the transceiver features high PLL bandwidth and excellent isolation between PLL and PA.

Theft of vehicles with current PEG car access systems can be carried out by extending the RF transmission with the help of two repeaters to gain unauthorized system access (known as a relay attack). The additional full duplex mode of Atmel's new transceiver ICs helps to effectively prevent relay attacks, since the system trying to attack the RF car access system needs to receive and transmit signals on the same frequency at the same time.

Samples of the new full-duplex RF transceiver ICs ATA5823/ATA5824 in QFN48 packages are alreadsy available. Pricing starts at $4.75 (10.000 quantities).

- Janine Love


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