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The PN532 is the most popular NFC chip, and is what is embedded in pretty much every phone or device that does NFC. It can pretty much do it all, such as read and write to tags and cards, communicate with phones (say for payment processing), and 'act' like a NFC tag. If you want to do any sort of embedded NFC work, this is the chip you'll want to use!
Because it can read and write tags, you can always just use this for RFID-tag projects.
The PN532 is also very flexible, you can use 3.3V TTL UART at any baud rate, I2C or SPI to communicate with it. This chip is also strongly supported by libnfc.
Longest effective communication distance of 3 cm
Supports switching of SPI, IIC and UART interface.
Can be used for 13.56M non-contact communication
Compatible with ISO14443 Type A and Type B standards
Power Supply Voltage
Max Supply Current
Working Current(Standby Mode)
Working Current(Write Mode)
Working Current(Read Mode)
SPI Interface, Std Raspberry Pi 20pins Interface