Data Sheet
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MFRC522 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.9 — 27 April 2016
112139 28 of 95
NXP Semiconductors
MFRC522
Standard performance MIFARE and NTAG frontend
Fig 21. Overview of MFIN and MFOUT signal routing
001aak594
MILLER
CODER
MFOutSel[3:0]
UART
Sel[1:0]
MFOUT
MFIN
TX bit stream
DIGITAL MODULE
MFRC522
ANALOG MODULE
MFRC522
RX bit stream
0
1
2
3
4
5
6
7
3-state
LOW
HIGH
test bus
internal envelope
TX serial data stream
reserved
RX serial data stream
MANCHESTER
DECODER
SUBCARRIER
DEMODULATOR
DRIVER
Sel[1:0]
0
1
2
3
3-state
internal envelope
HIGH
envelope from pin MFIN
0
1
2
3
LOW
Manchester with subcarrier
internal modulated
NRZ coding without subcarrier (> 106 kBd)
MODULATOR DRIVER
TX2
TX1
RX
DEMODULATOR