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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.
MFOUT
TX bit stream
MILLER
CODER
DIGITAL MODULE
MFRC522
3-state 0
LOW 1
HIGH 2
test bus 3
internal envelope 4
TX serial data stream 5
reserved 6
RX serial data stream 7
MFOutSel[3:0]
3-state 0
TX2
internal envelope 1
MODULATOR
DRIVER
envelope from pin MFIN 2
TX1
HIGH
3
DRIVER
Sel[1:0]
ANALOG MODULE
MFRC522
RX bit stream
MANCHESTER
DECODER
0 LOW
SUBCARRIER
DEMODULATOR
1 Manchester with subcarrier
2 internal modulated
UART 3 NRZ coding without subcarrier (> 106 kBd)
Sel[1:0]
DEMODULATOR
RX
MFIN
001aak594
Fig 21. Overview of MFIN and MFOUT signal routing