原标题：NXP PN512 POS机硬件参考设计

　　nxp公司的PN512是用于13.56MHz无接触通信的高度集成收发器,具有8位并行接口,SPI接口,串行UART和I2C接口,支持读写模式ISO/IEC 14443A/MIFARE和FeliCa标准以及ISO/IEC 14443B,卡工作模式ISO/IEC 14443A/MIFARE 和FeliCa标准以及NFCIP-1模式.工作电压2.6-3.5V,主要用在支付应用.本文介绍了PN512主要特性和优势,框图和多种应用模式框图, POS机参考设计OM5597/RD2663主要特性,主板和模块读板电路图以及PCB设计图.

　　The PN512 is a highly integrated transceiver IC for contactless communication at 13.56 MHz. This transceiver IC utilizes an outstanding modulation and demodulation concept completely integrated for different kinds of contactless communication methods and protocols at 13.56 MHz.

　　The PN512 transceiver ICs support 4 different operating modes

　　• Reader/Writer mode supporting ISO/IEC 14443A/MIFARE and FeliCa scheme

　　• Reader/Writer mode supporting ISO/IEC 14443B

　　• Card Operation mode supporting ISO/IEC 14443A/MIFARE and FeliCa scheme

　　• NFCIP-1 mode

　　Enabled in Reader/Writer mode for ISO/IEC 14443A/MIFARE, the PN512’s internal transmitter part is able to drive a reader/writer antenna designed to communicate with ISO/IEC 14443A/ MIFARE cards and transponders without additional active circuitry. The receiver part provides a robust and efficient implementation of a demodulation and decoding circuitry for signals from ISO/IEC 14443A/MIFARE compatible cards and transponders. The digital part handles the complete ISO/IEC 14443A framing and error detection (Parity & CRC).

　　The PN512 supports MIFARE 1K or MIFARE 4K emulation products. The PN512 supports contactless communication using MIFARE higher transfer speeds up to 424 kbit/s in both directions.

　　Enabled in Reader/Writer mode for FeliCa, the PN512 transceiver IC supports the FeliCa communication scheme. The receiver part provides a robust and efficient implementation of the demodulation and decoding circuitry for FeliCa coded signals. The digital part handles the FeliCa framing and error detection like CRC. The PN512 supports contactless communication using FeliCa Higher transfer speeds up to 424 kbit/s in both directions.

　　The PN512 supports all layers of the ISO/IEC 14443B reader/writer communication scheme, given correct implementation of additional components, like oscillator, power supply, coil etc. and provided that standardized protocols, e.g. like ISO/IEC 14443-4 and/or ISO/IEC 14443B anticollision are correctly implemented.

　　In Card Operation mode, the PN512 transceiver IC is able to answer to a reader/writer command either according to the FeliCa or ISO/IEC 14443A/MIFARE card interface scheme. The PN512 generates the digital load modulated signals and in addition with an external circuit the answer can be sent back to the reader/writer. A complete card functionality is only possible in combination with a secure IC using the S2C interface.

　　Additionally, the PN512 transceiver IC offers the possibility to communicate directly to an NFCIP-1 device in the NFCIP-1 mode. The NFCIP-1 mode offers different communication mode and transfer speeds up to 424 kbit/s according to the Ecma 340 and ISO/IEC 18092 NFCIP-1 Standard. The digital part handles the complete NFCIP-1 framing and error detection.

　　Various host controller interfaces are implemented:

　　• 8-bit parallel interface1

　　• SPI interface

　　• serial UART (similar to RS232 with voltage levels according pad voltage supply)

　　• I2C interface

　　PN512主要特性和优势:

　　 Highly integrated analog circuitry to demodulate and decode responses

　　 Buffered output drivers for connecting an antenna with the minimum number of external components

　　 Integrated RF Level detector

　　 Integrated data mode detector

　　 Supports ISO/IEC 14443 A/MIFARE

　　 Supports ISO/IEC 14443 B Read/Write modes

　　 Typical operating distance in Read/Write mode up to 50 mm depending on the antenna size and tuning

　　 Typical operating distance in NFCIP-1 mode up to 50 mm depending on the antenna size and tuning and power supply

　　 Typical operating distance in ISO/IEC 14443A/MIFARE card or FeliCa Card Operation mode of about 100 mm depending on the antenna size and tuning and the external field strength

　　 Supports MIFARE 1K or MIFARE 4K emulation encryption in Reader/Writer mode

　　 ISO/IEC 14443A higher transfer speed communication at 212 kbit/s and 424 kbit/s

　　 Contactless communication according to the FeliCa scheme at 212 kbit/s and 424 kbit/s

　　 Integrated RF interface for NFCIP-1 up to 424 kbit/s

　　 S2C interface

　　 Additional power supply to directly supply the smart card IC connected via S2C

　　 Supported host interfaces

　　 SPI up to 10 Mbit/s

　　 I2C-bus interface up to 400 kBd in Fast mode, up to 3400 kBd in High-speed mode

　　 RS232 Serial UART up to 1228.8 kBd, with voltage levels dependant on pin voltage supply

　　 8-bit parallel interface with and without Address Latch Enable

　　 FIFO buffer handles 64 byte send and receive

　　 Flexible interrupt modes

　　 Hard reset with low power function

　　 Power-down mode per software

　　 Programmable timer

　　 Internal oscillator for connection to 27.12 MHz quartz crystal

　　 2.5 V to 3.6 V power supply

　　 CRC coprocessor

　　 Programmable I/O pins

　　 Internal self-test

　　图1. PN512框图

　　图2. PN512读/写模式

　　图3. PN512 ISO/IEC14443/MIFARE读/写模式通信框图

　　图4. PN512 FeliCa读/写模式通信框图

　　图5.NFCIP-1模式

　　图6. PN512典型应用电路

　　POS机参考设计OM5597 RD2663

　　This document describes the basic functionality and electrical specifications of the OM5597 RD2663.

　　The OM5597 RD2663 is designed for use in development purposes as demonstration hardware. It is designed to fulfill EMVCO 2.2b specifications. It is not designed to be a full hardware design reference especially the main board. The Design covers the contact and contactless communication. For that reason the mainboard contains 4 additional SAM slots and an Antenna around the Display.

　　The OM5597 is a family of POS design-in kits that reduce the barrier for point of sales terminal designs making use of the contactless technology. OM5597/RD2612 and OM5597/RD2663 are design-in kits for development of an EMV compliant Point of Sales Terminal based on NXP components. The OM5597/RD2612 makes use of the PN512 NFC Frontend IC and implements an antenna amplifier for optimum RF performance. The OM5597/RD2663 makes use of the CLRC663 high performance NFC reader solution and achieves the EMV Level 1 RF compliance without additional booster.

　　Both design-in kits provide an EMV Level 1 compliant software stack for contactless as well as contact payment based on TDA8026.

　　POS机参考设计OM5597/RD2663主要特性:

　　EMVCo compliant contactless smart card reader

　　EMVCo compliant contact smart card reader based on TDA8026

　　EMV Level 1 compliant contact and contactless software stack

　　First step of contact and contactless EMV payment application selection with card / phoneshowcase

　　Closed loop payment showcase

　　NFC Peer to Peer communication showcase

　　POS机参考设计OM5597/RD2663应用:

　　 Payment

　　图7. POS机参考设计OM5597/RD2663外形图

　　图8. POS机参考设计OM5597/RD2663硬件框图

　　图9. POS机参考设计OM5597/RD2663软件框图

　　图10. POS机参考设计OM5597/RD2663应用状态机

　　The mainboard contains the connectors for all modules as well as the power management (3.3V regulator and reverse voltage protection). In addition to that 4 SAM slots, for contact communication, are routed to the bottom layer of the main board. The pcb is a only 2 layer structure compared to the reader board that has a 4 layer structure.

　　To optimize contactless performance the ground plain underneath the antenna is removed to avoid losses caused by eddy current. This is recommended in every contactless 13.56MHz design otherwise a significant amount of energy is wasted in that area.

　　The reader module board contains the CLRC663, LPC1768 and TDA8026ET. That means it contains all major parts needed for a point of sales reader. The board is a 4Layer design. The layout is done with Altium and is online available on OM559/RD2663 Web page.