Overview
This is a Raspberry Pi NFC HAT based on PN532 operating in the 13.56MHz frequency range. It supports three communication interfaces: I2C, SPI, and UART.
NFC (Near Field Communication) is a wireless technology allows contactless point-to-point data communication between devices within a short distance of 10 cm. It is widely used in applications such as access control system, smart tickets, meal card, etc.
Based on the popular NFC controller PN532 with multi interface options, this HAT will easily enable NFC function for your Raspberry Pi.
Features

Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
Onboard PN532 chip, supports various NFC/RFID cards like MIFARE/NTAG2xx, etc.
Three interface options: I2C, SPI, and UART, configured via jumpers and switches
Breakout control pins, for easily connecting with host boards like STM32/Arduino
Comes with development resources and manual (examples for Raspberry Python/C, STM32, Arduino)

Specifications

NFC controller: PN532
Operating voltage: 3.3V/5V
Operating frequency: 13.56MHz
Communication interfaces: I2C, SPI, UART (default)
Default baudrate: 115200 bps
Operating modes:

reader/writer mode supporting ISO/IEC 14443A / MIFARE scheme
reader/writer mode supporting FeliCa scheme
reader/writer mode supporting ISO/IEC 14443B scheme
card operation mode supporting ISO 14443A / MIFARE scheme
card operation mode supporting FeliCa scheme
card operation mode supporting ISO/IEC18092, ECM340 point-to-point

Applications

Contactless payment system
Bluetooth and WiFi devices chaining
Social sharing function like sharing contacts, photos, and videos
Smart phone NFC app

What’s on Board

Raspberry Pi GPIO connector:for connecting with Raspberry Pi
PN532 control pins:for connecting with other host boards like STM32
NFC induction coil
PN532 chip:NFC controller
Power indicator
DIP switches:for configuring the connection between PN532 and Raspberry Pi (only one of the I2C/SPI/UART can be connected at the same time)
Mode selection:

I0-L, I1-L: enable UART
I0-H, I1-L: enable I2C
I0-L, I1-H: enable SPI

INT0 jumper:response signal, connects to Raspberry Pi D16
RSTPDN jumper:reset signal, connects to Raspberry Pi D20

Dimensions

Development Resources
Wiki :www.waveshare.com/wiki/PN532_NFC_HAT
Package Content

PN532 NFC HAT x1
MIFARE Classic 1K Card x1