基于PN512設計的13.56MHz無接觸通信收發(fā)技術
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The PN512 is a highly integrated transceiverIC for contactless communication at 13.56MHz. This transceiverIC utilizes an outstanding modulation and demodulation concept completely integrated for different kinds of contactless communication methods and protocols at 13.56MHz.
The PN512 transceiverICs support 4 different operating modes
?Reader/Writer mode supporting ISO/IEC14443A/MIFARE and FeliCa scheme
?Reader/Writer mode supporting ISO/IEC14443B
?Card Operation mode supporting ISO/IEC14443A/MIFARE and FeliCa scheme
?NFCIP-1 mode
Enabled in Reader/Writer mode for ISO/IEC14443A/MIFARE, the PN512’s internal transmitter part is able to drive a reader/writer antenna designed to communicate with ISO/IEC14443A/ 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/IEC14443A/MIFARE compatible cards and transponders. The digital part handles the complete ISO/IEC14443A framing and error detection (Parity CRC).
The PN512 supports MIFARE 1KB or MIFARE 4 KB emulation products. The PN512 supports contactless communication using MIFARE higher transfer speeds up to 424kbit/s in both directions.
Enabled in Reader/Writer mode for FeliCa, the PN512 transceiverIC 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 424kbit/s in both directions.
The PN512 supports all layers of the ISO/IEC14443B 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/IEC14443-4 and/or ISO/IEC14443B anticollision are correctly implemented.
In Card Operation mode, the PN512 transceiverIC is able to answer to a reader/writer command either according to the FeliCa or ISO/IEC14443A/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 transceiverIC 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 424kbit/s according to the Ecma 340 and ISO/IEC18092 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.
圖1.PN512方框圖
圖2.PN512 ISO/IEC14443A/MIFARE讀/寫模式通信框圖
圖3.PN512 FeliCa讀/寫模式通信框圖
圖4.PN512共同讀/寫選通與主控制器連接框圖
圖5.PN512典型應用電路圖
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