Microchip ATA5795

Description

This application note introduces Atmel® ATA5795 as a building block to design a key fob with an integrated transponder and RKE functionality for the automotive industry.

Features

• Integrated key fob solution integrating MCU and a passive transponder functionality using Fc = 125kHz for immobilizer applications via a contactless LF interface and an RF transmitter functionality with programmable Fc = 300MHz to 433MHz for RKE applications
• Transponder includes immobilizer SW stack supporting the immobilizer authentication protocol programmed at the factory
• Open source immobilizer SW stack Is based on flexible communication protocol.
• The protocol is configurable using transponder configuration memory
• Immobilizer command set supports various classes of commands such as start authentication, read UID, read/write user memory, learn secret key1/2, and read transponder error status
• Integrated high speed AES-128 hardware crypto module
• Atmel ATA5795 includes segmented program and user data nonvolatile memories with protection locks
• Ultra low power consumption enables passive transponder functionality at low coupling factors (k < 0.8% typ.)
• Integrated RF transmitter module with selectable Fc using fractional PLL in ISM bands (315/430MHz)
• Configurable radiated power output pout at up to +12.5dBm
• Integrated flash-based Atmel ATmega 8-bit MCU includes ultra low-power design with many dedicated data communication and mixed-signal peripherals. Includes on-chip internal oscillators at 4MHz and 125kHz with RTC

More information

• Datasheet