MFRC522 datasheet(26/96 Pages) NXP

26 / 96 page

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Remark: Pins MFIN and MFOUT have a dedicated supply on pin SVDD with the ground on pin PVSS. If pin MFIN is not

used it must be connected to either pin SVDD or pin PVSS. If pin SVDD is not used it must be connected to either pin DVDD,

pin PVDD or any other voltage supply pin.

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

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]

3-state

internal envelope

HIGH

envelope from pin MFIN

LOW

Manchester with subcarrier

internal modulated

NRZ coding without subcarrier (> 106 kBd)

MODULATOR

DRIVER

TX2

TX1

DEMODULATOR

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