This module is built around NXP PN532, and the maker break out almost all of the I/O pins of the NXP532 chip on this little module.
In the module, the I2C and HSU share the same pins. The definition of the I2C pins is labeled on top of the breakout board, while the HSU’s is labeled at the bottom. Although the HSU mode is configured as the default mode, with a small on-board SMD DIP switch, it becomes pretty easy to change among I2C, SPI, and HSU interfaces.
80C51 microcontroller core with 40 Kbyte ROM and 1 Kbyte RAM
Highly integrated analog circuitry to demodulate and decode responses
Buffered output drivers to connect an antenna with minimum number of external components
Integrated RF level detector
Integrated data mode detector
RFID reader/writer mode support [MIFARE 1k, 4k, Ultra light, and DESFIRE cards, ISO/IEC 14443-4 cards such as CD97BX, CD light, DESFIRE, P5CN072 (SMX), INNOVISION Jewel cards such as IRT5001 card, FELICA cards such as RCS_860 and RCS_854]
Built in PCB Antenna, with 5cm to7cm communication distance
Supports MIFIRE higher transfer speed communication at 212Kbits/s and 424 Kbits/s
Supported host communication: SPI Interface, I2C Interface and High Speed Serial UART
Flexible interrupt using IRQ pin
Hard reset with low power function
Power down mode per embedded firmware
Automatic wake up on HSU,I2C and SPI interfaces when device is in power down mode
Programmable timer
Contactless communication at 13.56MHz
On-board level shifter, Standard 5V TTL for I2C and UART, 3.3V TTL SPI
Work as RFID reader and writer
Work as RFID card or a virtual card
On-board level shifter: Standard 5V TTL for I2C and UART, 3.3V TTL SPI
