PN532 NFC/RFID Read-Write Module, 13.56MHz, I2C/SPI/UART

The PN532 is a considerably more capable chip than the simpler RC522, offering genuine NFC functionality alongside basic RFID reading - meaning it can not only read passive tags but also exchange data directly with NFC-enabled smartphones and emulate a virtual card itself, opening up peer-to-peer and mobile-interaction use cases that a basic reader-only RFID module can't handle.

Three selectable communication interfaces - I2C, SPI, and HSU (high-speed UART) - give real flexibility in how the module connects to a host microcontroller, letting a project pick whichever interface best fits its remaining free pins rather than being locked into one wiring scheme. An onboard level shifter handles the voltage translation automatically, supporting 3.3V to 24V TTL logic on the I2C/UART side and 3.3V TTL with series resistors on SPI, so it plays nicely with both 3.3V and 5V-logic microcontroller boards without extra components.

At the core is the PN532 chip itself, built around an 80C51 microcontroller core with 40KB ROM and 1KB RAM dedicated to handling the NFC/RFID protocol stack, running at the standard 13.56MHz frequency. Communication range with a tag or card is rated at 4 to 7cm depending on antenna type, and the module operates across a 3.3 to 5V supply range.

Supported modes cover RFID reader/writer operation against ISO14443-A cards, genuine NFC peer-to-peer data exchange, and virtual card emulation, making this a considerably more versatile choice than a basic RC522 for projects that need to talk to phones, emulate access cards, or go beyond simple tag reading. Builders prototyping mobile-tap payment demos, phone-based access systems, or any project bridging a microcontroller with NFC-enabled devices will find the PN532 the right step up from entry-level RFID modules.