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MFRC523 Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. MFRC523
Description  Contactless reader IC
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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MFRC523 Datasheet(HTML) 9 Page - NXP Semiconductors

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MFRC523_33
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 5 March 2010
115233
9 of 98
NXP Semiconductors
MFRC523
Contactless reader IC
The internal CRC coprocessor calculates the CRC value based on ISO/IEC 14443 A
part 3 and handles parity generation internally according to the transfer speed. Automatic
parity generation can be switched off using the ManualRCVReg register’s ParityDisable
bit.
8.2 ISO/IEC 14443 B functionality
The MFRC523 reader IC fully supports international standard ISO 14443 which includes
communication schemes ISO 14443 A and ISO 14443 B.
Refer to the ISO 14443 reference documents Identification cards - Contactless integrated
circuit cards - Proximity cards (parts 1 to 4).
Remark: NXP Semiconductors does not offer a software library to enable design-in of the
ISO 14443 B protocol.
8.3 Digital interfaces
8.3.1 Automatic microcontroller interface detection
The MFRC523 supports direct interfacing of hosts using SPI, I2C-bus or serial UART
interfaces. The MFRC523 resets its interface and checks the current host interface type
automatically after performing a power-on or hard reset. The MFRC523 identifies the host
interface by sensing the logic levels on the control pins after the reset phase. This is done
using a combination of fixed pin connections. Table 5 shows the different connection
configurations.
Fig 6.
Data coding and framing according to ISO/IEC 14443 A
001aak585
ISO/IEC 14443 A framing at 106 kBd
8-bit data
8-bit data
8-bit data
odd
parity
odd
parity
start
odd
parity
start bit is 1
ISO/IEC 14443 A framing at 212 kBd, 424 kBd and 848 kBd
8-bit data
8-bit data
8-bit data
odd
parity
odd
parity
start
even
parity
start bit is 0
burst of 32
subcarrier clocks
even parity at the
end of the frame
Table 5.
Connection protocol for detecting different interface types
Pin
Interface type
UART (input)
SPI (output)
I2C-bus (I/O)
SDA
RX
NSS
SDA
I2C
001
EA
01EA
D7
TX
MISO
SCL


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