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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MFRC522 데이터시트(PDF) 64 Page - NXP Semiconductors |
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MFRC522 데이터시트(HTML) 64 Page - NXP Semiconductors |
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64 / 109 page  112132 © 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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