Справочник Пользователя для Atmel ATAK2270

4871E–RFID–04/08

The ATAK2270 application board unit (

) consists of a ready-to-run standard microcontroller 

main board equipped with the Atmel AVR

®

 microcontroller ATmega8515L, combined with a piggybacked 

antenna interface board containing the U2270B reader IC.

The following functionality is controlled by the AVR microcontroller:

„

Handling of the bi-directional data communication between the RS232 interface and the host PC

„

Execution of the read and write commands to be sent to the antenna interface

„

Decoding of the specific read data delivered by the antenna interface

The source program is written in C, and the compiled hex code is loaded in the 8-kByte Flash of the 
microcontroller.

To operate the reader board, an external power supply in the range of DC 10V to 15V/200 mA has to be 
connected to the jack, alternatively use the mains SMPS. A bridge rectifier placed at the connector input 
is used for polarity independence.

The antenna interface (

) is supplied and controlled by the main board via header pin X2/1. The 

current power supply voltage is indicated by LED1, Power. To adapt a specific antenna coil to the reso-
nant frequency and the Q factor, the components CANT1/CANT2 and R14 (

) can be changed. 

For the antenna included in the kit, the parameters are matched as follows:

Resonant frequency: 

f

res

 = 125 kHz ±1%, adjusted by CANT1/CANT2 with jumper 3 in 

 

position dis

Whole antenna quality factor: 

Q = 20, adjusted by R14