Atmel ATA5505 [Preliminary]
1. Description
The Atmel® ATA5505 is an Atmel AVR® microcontroller with LF-RFID reader/writer front end
and LIN interface for low cost network applications.
The Atmel ATA5505 incorporates the energy-transfer circuit for supplying the transponder. It
consists of an on-chip power supply, an oscillator, and a coil driver optimized for automo-
tive-specific distances. It also includes all signal-processing circuits which are necessary to
transform the small input signal into a microcontroller-compatible signal.
The Atmel ATA5505 integrates a low-power CMOS 8-bit microcontroller based on the Atmel
AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle,
the ATA5505 achieves throughputs approaching 1 MIPS per MHz, allowing the system
designer to optimize power consumption versus processing speed.
The Atmel AVR core combines a rich instruction set with 32 general purpose working regis-
ters. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two
independent registers to be accessed in a single instruction executed in one clock cycle. The
resulting architecture is more code-efficient while achieving throughputs up to ten times faster
than conventional CISC microcontrollers.
The Atmel ATA5505 provides the following features: 16K byte of in-system programmable
Flash, 512bytes EEPROM, 512bytes SRAM, 16 general purpose I/O lines, 32 general purpose
working registers, one 8-bit timer/counter with compare modes, one 8-bit high speed
timer/counter, a universal serial interface, a LIN controller, internal and external interrupts, an
11-channel, 10-bit ADC, a programmable watchdog timer with internal oscillator, and three
software selectable power saving modes. The Idle mode stops the CPU while allowing the
SRAM, timer/counter, ADC, analog comparator, and interrupt system to continue functioning.
Power-down mode saves the register contents, disabling all chip functions until the next inter-
rupt or hardware reset. To minimize switching noise during ADC conversions, ADC noise
reduction mode stops the CPU and all I/O modules except ADC,
The device is manufactured using Atmel’s high-density non-volatile memory technology. The
on-chip ISP Flash allows the program memory to be re-programmed in-system via an SPI
serial interface, by a conventional non-volatile memory programmer or by an on-chip boot
code running on the Atmel AVR core. The boot program can use any interface to download the
application program in the Flash memory. By combining an 8-bit RISC CPU with in-system
self-programmable Flash on a monolithic chip, the Atmel ATA5505 is a powerful microcon-
troller providing a highly flexible and cost-effective solution to many embedded control
applications.
The Atmel ATA5505 AVR is supported with a full suite of program and system development
tools including: C compilers, macro assemblers, program debuggers/simulators, in-circuit
emulators, and evaluation kits.
3
9219A–RFID–01/11
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