COM1B1 datasheet(5/294 Pages) ATMEL

Part #	COM1B1

Description	High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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5

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

Figure 1-3.

Block Diagram

Figure 1-4 shows the front end in more detail. The circuit block depicted consists of the

receiver, an internal oscillator and driver for the coil, and a power supply unit.

Figure 1-4.

Reader Front End Block Diagram

Control (0 to 3)

PB (0 to 7)

DGND

Input

COIL2

COIL1

Flash

Power / Reset

Reader Frontend

AVR CPU

LIN / UART

EEPROM

Watchdog

Atmel ATA5505

SRAM

Timer

SPI

A/D

converter

Port B

Port A

AVCC

V

CC

GND

AGND

Input

PA (0 to 7)

Power supply

DV

S

V

EXT

Frequency

adjustment

&

Schmitt trigger

Frontend

Standby

MS

CFE

OE

Output

RF

Control (0 to 3)

DGND

Input

COIL2

COIL1

Oscillator

= 1

Lowpass filter

HIPASS

V

S

V

Batt

Driver

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