Product data

MFRC631 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 4 February 2014
227433 12 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
The MFRC631 connection to a host is required to manage the complete
ISO/IEC 14443 A/MIFARE protocol. Figure 6
shows the data coding and framing
according to ISO/IEC 14443A /MIFARE.
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.
Table 5. Communication overview for ISO/IEC 14443 A/MIFARE reader/writer
Communication
direction
Signal type Transfer speed
106 kbit/s 212 kbit/s 424 kbit/s 848 kbit/s
Reader to card (send
data from the
MFRC631 to a card)
fc = 13.56 MHz
reader side
modulation
100 % ASK 100% ASK 100% ASK 100% ASK
bit encoding modified Miller
encoding
modified Miller
encoding
modified Miller
encoding
modified Miller
encoding
bit rate [kbit/s] fc / 128 fc / 64 fc / 32 fc / 16
Card to reader
(MFRC631 receives
data from a card)
card side
modulation
subcarrier load
modulation
subcarrier load
modulation
subcarrier load
modulation
subcarrier load
modulation
subcarrier
frequency
fc/16fc/16fc /16fc/16
bit encoding Manchester
encoding
BPSK BPSK BPSK
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