1. Introduction
This document describes the functionality and electrical specifications of the contactless
reader/writer MFRC522.
Remark: The MFRC522 supports all variants of the MIFARE Mini, MIFARE 1K,
MIFARE 4K, MIFARE Ultralight, MIFARE DESFire EV1 and MIFARE Plus RF
identification protocols. To aid readability throughout this data sheet, the MIFARE Mini,
MIFARE 1K, MIFARE 4K, MIFARE Ultralight, MIFARE DESFire EV1 and MIFARE Plus
products and protocols have the generic name MIFARE.
1.1 Differences between version 1.0 and 2.0
The MFRC522 is available in two versions:
• MFRC52201HN1, hereafter referred to version 1.0 and
• MFRC52202HN1, hereafter referred to version 2.0.
The MFRC522 version 2.0 is fully compatible to version 1.0 and offers in addition the
following features and improvements:
• Increased stability of the reader IC in rough conditions
• An additional timer prescaler, see Section 8.5.
• A corrected CRC handling when RX Multiple is set to 1
This data sheet version covers both versions of the MFRC522 and describes the
differences between the versions if applicable.
2. General description
The MFRC522 is a highly integrated reader/writer IC for contactless communication
at 13.56 MHz. The MFRC522 reader supports ISO/IEC 14443 A/MIFARE and NTAG.
The MFRC522’s internal transmitter is able to drive a reader/writer antenna designed to
communicate with ISO/IEC 14443 A/MIFARE cards and transponders without additional
active circuitry. The receiver module provides a robust and efficient implementation for
demodulating and decoding signals from ISO/IEC 14443 A/MIFARE compatible cards and
transponders. The digital module manages the complete ISO/IEC 14443 A framing and
error detection (parity and CRC) functionality.
The MFRC522 supports MF1xxS20, MF1xxS70 and MF1xxS50 products. The MFRC522
supports contactless communication and uses MIFARE higher transfer speeds up to
848 kBd in both directions.
MFRC522
Standard performance MIFARE and NTAG frontend
Rev. 3.9 — 27 April 2016
112139
Product data sheet
COMPANY PUBLIC
