Introduction
This document describes the functionality and electrical specifications of the contactless reader/writer MFRC523.

General description
The MFRC523 is a highly integrated reader/writer for contactless communication at 13.56 MHz. The MFRC523 reader supports ISO/IEC 14443 A/MIFARE mode.

FEATUREs and benefits
Highly integrated analog circuitry to demodulate and decode responses
Buffered output drivers for connecting an antenna with the minimum number of external components
Supports ISO/IEC 14443 A/MIFARE
Supports ISO/IEC 14443 B Read/Write modes
Typical operating distance in Read/Write mode up to 50 mm depending on the antenna size and tuning
Supports MIFARE Mini, MIFARE 1K and MIFARE 4K encryption in Read/Write mode
Supports ISO/IEC 14443 A higher transfer speed communication at 212 kBd, 424 kBd and 848 kBd
Supports MFIN/MFOUT
Additional internal power supply to the smart card IC connected via MFIN/MFOUT
Supported host interfaces
  ‹SPI up to 10 Mbit/s
  ‹I2C-bus interface up to 400 kBd in Fast mode, up to 3400 kBd in High-speed mode
‹  RS232 Serial UART up to 1228.8 kBd, with voltage levels dependant on pin voltage supply
FIFO buffer handles 64 byte send and receive
Flexible interrupt modes
Hard reset with low power function
Power-down by software mode
Programmable timer
Internal oscillator for connection to 27.12 MHz quartz crystal
2.5 V to 3.3 V power supply
CRC coprocessor
Programmable I/O pins
Internal self-test