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MFRC522 Datasheet(PDF) 64 Page - NXP Semiconductors

Part # MFRC522
Description  Contactless Reader IC
PDF  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Datasheet(HTML) 64 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
64 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
Remark: The MFRC522 has an extra supply pin (SVDD and PVSS as Ground line) for the
MFIN and MFOUT pads.
If MFIN pin is not used it should be connected to SVDD or PVSS.
If SVDD pin is not used it should be connected to DVDD or PVDD or any other
voltage supply pin.
11.5 CRC co-processor
The following parameters of the CRC co-processor can be configured. The CRC preset
value can either be 0000h, 6363h, A671h or FFFFh depending on the bits CRCPreset in
register ModeReg.
The CRC polynomial for the 16-bit CRC is fixed to x16 +x12 +x5 +1.
The register CRCResultReg indicates the result of the CRC calculation. This register is
split into two 8-bit registers indicating the higher and lower byte.
The bit MSBFirst in the register ModeReg indicates that data will be loaded with MSB first.
Fig 21. Overview MFIN/MFOUT Signal Routing
Digital Part
M FR C 522
Analog Part
M FR C 522
M iller
Coder
M anchester
D ecoder
M odulator
Dem odulator
Driver
D river
Sel
1
TS
0
1
2
3
MFO ut
Sel
UA RT
Sel
0
1
2
3
0
S ub-carrier
D em odulator
MFIN
TX1
TX2
internal
N R Z coding w /o sub-
carrier (> 106 kbps)
M anchester w sub-carrier
Envelop
RX
0
1
2
3
4
5
6
7
TS
0
1
TestBus
internal
Serial data stream Tx
RFU
Serial data stream R x
MFO U T
Tx Bit Stream
R x B it Stream
Table 147: CRC co-processor parameters
Parameter
Value
CRC Register Length
16 bit CRC
CRC Algorithm
Algorithm according ISO/IEC 14443A and CCITT
CRC Preset Value
0000h, 6363h,A671h or FFFFh depending on the CRCPresetReg
register settings



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