The features PN532 offers are mostly available in specific devices only and increasing daily due to their market demands. The device may be smaller in size but the features list of this device is much different and according to the modern applications. It’s a clock pin, helps in Transreceiving of data according to the clock pulse. SS is a slave select pin it activates the SPI communication of the Slave (PN532). MISO is a Master In Slave Out, it helps to transmit data from PN532 to Arduino. Therefore, MOSI is a Master Out Slave In pin, it helps to transmit data from Arduino to PN532. SPI communication requires 4-pins for data communication. In PN532 this device is for I2C communication. RST is a reset pin, which helps to reset the device through an external signal. IRQ pin is an interrupt pin, which helps to I2C communication to generate the interrupt to get the attention of the Arduino/Microcontroller. Data travel between devices according to the clock pulse. SCL is the clock pin of I2C communication. Therefore, in the PN532 module SDA is a data pin for I2C communication. I2C communication requires one pin for data transmission and receiving. The RXD pin is the data receiving pin of the UART communication. UART communication requires two communication pins one for transmitting data and second for receiving it. GND pin helps to make the common ground with power supply and the Arduino/Microcontroller.
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