Atmel ATA5791 is a smart Passive Entry/Passive Start (PEPS) device that includes an embedded ultra-low-power AVR® 8-bit microcontroller, a three-dimensional LF receiver function, a fractional-N RF transmitter function as well as an LF immobilizer interface in a single QFN38 package. Furthermore, the device has an integrated AES-128 cryptography hardware engine, which is accessible via both the immobilizer and the PEPS unit. The immobilizer interface can operate in contactless mode thus allowing the energy supply as well as data transmission via the LF link.

The ATA5790N offers the lowest current consumption in the industry, with a typical listening mode of less than 4.7 microampere. Also, the 3D LF receivers has an outstanding sensitivity of 1.5mVpp worst case.The Atmel ATA5791 is designed for automotive keyfob application that require immobilizer, RF communication as well as a Passive Entry/Passive Start functions in one device. It’s fully compliant with extremely low power consumption requirements and provides all the necessary circuitry for the entire application.