Reader RFID NFC pn532 Shield ic Card Board Expansion For Arduino

Shield communicates via I2C or SPI bus. By default, the manufacturer has chosen I2C interface because it uses fewer pins: needed are only analog pins -4 and 5. Connected is also digital pin 2, which handles an interrupt indicating about receive the data. Thanks to this solution, there's no need to constantly, in a loop to ask the boards if there appeared any RFID tags within range of the antenna.

PN532 RFID Reader Shield :
Reader mode, supports ISO / IEC 14443A / MIFARE? Mechanism
Reader mode support FeliCa mechanism
Reader mode, supports ISO / IEC 14443B mechanism
Card mode of operation, supports ISO 14443A / MIFARE? Mechanism
Card mode of operation, FeliCa mechanism
ISO / IEC18092 , ECM340 Point-to-point
PN532 features
With 40 kB ROM and 1 kB RAM of the 80C51 microcontroller core
Highly integrated analog circuit, demodulation and decoding response
The output buffered drive connects the antenna through a minimum of external passive devices
Integrated RF field detector
Integrated data pattern detector
Support ISO / IEC 14443A / MIFARE?
Only ISO / IEC 14443B is supported in reader / writer mode
In the reader mode, the typical working distance of more than 50mm , the specific distance from the antenna size, tuning and power to decide
In NFCIP-1 mode working distance up to 50mm , depending on the size of the antenna, tuning and power supply
Typical operating distances in the card operating mode are approximately 100 mm and the specific distance is determined by antenna size, tuning, and external field strength
In the reader mode, support Mifare Classic encryption, can support 212 kbit / s and 424 kbit / s two higher data transmission speed
FeliCa mode, support 106kbit / s , 212kbit / s and 424kbit / s communication baud rate
Integrated NFCIP-1 of the RF interface, transfer rate up to 424kbit / s
Host Interface Support:
- the SPI Interface
- the I2C Interface
- Serial UART