MFRC522_ Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

MFRC522_

Contactless reader IC

NXP Semiconductors. 

NXP Semiconductors

MFRC522

Contactless reader IC

8. Functional description

The MFRC522 transmission module supports the Read/Write mode for

ISO/IEC 14443 A/MIFARE using various transfer speeds and modulation protocols.

BATTERY

MICROCONTROLLER

MFRC522

reader/writer

Fig 4. MFRC522 Read/Write mode

The physical level communication is shown in Figure 5.

ISO/IEC 14443 A CARD

contactless card

001aak583

ISO/IEC 14443 A

READER

MFRC522

(1)

ISO/IEC 14443 A CARD

(2)

001aak584

(1) Reader to card 100 % ASK, Miller encoded, transfer speed 106 kBd to 848 kBd.

(2) Card to reader subcarrier load modulation, Manchester encoded or BPSK, transfer speed 106 kBd

to 848 kBd.

Fig 5. ISO/IEC 14443 A/MIFARE Read/Write mode communication diagram

The physical parameters are described in Table 4.

Table 4. Communication overview for ISO/IEC 14443 A/MIFARE reader/writer

Communication

direction

Signal type

Transfer speed

106 kBd

212 kBd

424 kBd

Reader to card (send

data from the

MFRC522 to a card)

reader side

modulation

bit encoding

100 % ASK

modified Miller

encoding

100 % ASK

modified Miller

encoding

100 % ASK

modified Miller

encoding

bit length

128 (13.56 μs) 64 (13.56 μs)

32 (13.56 μs)

Card to reader

(MFRC522 receives

data from a card)

card side

modulation

subcarrier

frequency

subcarrier load

modulation

13.56 MHz / 16

subcarrier load

modulation

13.56 MHz / 16

subcarrier load

modulation

13.56 MHz / 16

bit encoding

Manchester

encoding

BPSK

BPSK

848 kBd

100 % ASK

modified Miller

encoding

16 (13.56 μs)

subcarrier load

modulation

13.56 MHz / 16

BPSK

The MFRC522’s contactless UART and dedicated external host must manage the

complete ISO/IEC 14443 A/MIFARE protocol. Figure 6 shows the data coding and

framing according to ISO/IEC 14443 A/MIFARE.

MFRC522_34

Product data sheet

PUBLIC

All information provided in this document is subject to legal disclaimers.

Rev. 3.4 — 5 March 2010

112134

© NXP B.V. 2010. All rights reserved.

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