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| TRF7970A NFC有源和無源P2P通信參考設計 |
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| 文章來源： 更新時間：2014/8/25 13:34:00 |
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TI公司的TRF7970A是多協議全集成的13.56-MHz RFID/NFC收發器IC,支持NFC標準NFCIP-1 (ISO/IEC 18092)和NFCIP-2(ISO/IEC 21481),和ISO15693, ISO18000-3, ISO14443A/B以及 FeliCa兼容,并集成編碼器,譯碼器和數據成幀,工作電壓2.7V-5.5V,可編程輸出功率+20 dBm (100 mW), +23 dBm (200 mW),主要用在移動設備(平板電腦,手機),短程無線通信,藍牙和Wi-Fi等無線網絡,公共交通,醫療設備,產品識別,POS和護照讀系統,接入系統以及電子商務卡共享等.本文介紹了TRF7970A主要特性,框圖,典型應用電路以及NFC有源和無源P2P通信參考設計主要特性,電路圖和材料清單.
The TRF7970A device is an integrated analog front end and data-framing device for a 13.56-MHz RFID and Near Field Communication (NFC) system. Built-in programming options make the device suitable for a wide range of applications for proximity and vicinity identification systems.
The device can perform in one of three modes: RFID and NFC reader, NFC peer, or in card emulation mode. Built-in user-configurable programming options make the device suitable for a wide range of applications. The TRF7970A device is configured by selecting the desired protocol in the control registers. Direct access to all control registers allows fine tuning of various reader parameters as needed.
Documentation, reference designs, EVM, and source code TI MSP430 MCUs or ARM MCUs are available.
TRF7970A主要特性:
Supports Near Field Communication (NFC) Standards NFCIP-1 (ISO/IEC 18092) and NFCIP-2 (ISO/IEC 21481)
Completely Integrated Protocol Handling for ISO15693, ISO18000-3,ISO14443A/B, and FeliCa
Integrated Encoders, Decoders, and Data Framing for NFC Initiator, Active and Passive Target Operation for All Three Bit Rates (106 kbps, 212 kbps, 424 kbps) and Card Emulation
RF Field Detector With Programmable Wake-Up Levels for NFC Passive Transponder Emulation Operation
RF Field Detector for NFC Physical Collision Avoidance
Integrated State Machine for ISO14443A Anticollision (Broken Bytes) Operation (Transponder Emulation or NFC Passive Target)
Input Voltage Range: 2.7 VDC to 5.5 VDC
Programmable Output Power: +20 dBm (100 mW), +23 dBm (200 mW)
Programmable I/O Voltage Levels From 1.8 VDC to 5.5 VDC
Programmable System Clock Frequency Output (RF, RF/2, RF/4) from 13.56-MHz or 27.12-MHz Crystal or Oscillator
Integrated Voltage Regulator Output for Other System Components (MCU,Peripherals, Indicators),20 mA (Max)
Programmable Modulation Depth
Dual Receiver Architecture With RSSI for Elimination of "Read Holes" and Adjacent Reader System or Ambient In-Band Noise Detection
Programmable Power Modes for Ultra Low-Power System Design (Power Down <1 µA)
Parallel or SPI Interface (With 127-Byte FIFO)
Temperature Range: –40℃ to 110℃
32-Pin QFN Package (5 mm x 5 mm)
TRF7970A 應用:
• Mobile Devices (Tablets, Handsets)
• Short-Range Wireless Communication Tasks
• Secure Pairing ( Bluetooth®, Wi-Fi®, Other Paired (Firmware Updates)
Wireless Networks)
• Product Identification or Authentication
• Public Transport or Event Ticketing
• Medical Equipment or Consumables
• Passport or Payment (POS) Reader Systems
• Access Control, Digital Door Locks
• Sharing of Electronic Business Cards
圖1. TRF7970A框圖
圖2. TRF7970A應用電路圖:并行MCU接口
圖3. TRF7970A應用電路圖:SPI和SS模式MCU接口
NFC有源和無源P2P通信參考設計
This Near Field Communication (NFC) reference design provides a firmware example for implementing an NFC Peer to Peer (P2P) application. It is used for showing the application developer the correct way to implement a robust peer-to-peer project using the TRF7970A in both active and passive modes. The complexity of the Peer to Peer protocols and amount of NFC documentation that needs to be reviewed has traditionally been a barrier to developers creating NFC applications. This reference design solves this problem by providing a small number (five total) of easy to use Application Programming Interfaces (APIs). The documentation, hardware, and example code provided allows the designer to quickly implement NFC P2P functionality with an MSP430 or other MCU of choice.
NFC有源和無源P2P通信參考設計主要特性:
Proven interoperabilty with most commonly available NFC enabled mobile devices
Supports Simple NDEF Exchange Protocol (SNEP) and Logical Link Control Protocol (LLCP)
Passive and Active Modes as Initiator and Target at 106kbps, 212kbps and 424kbps
Includes easily configurable GUI Software which allows selection of individual mode(s)
GUI Software has throughput measurement capability and payload storage, used for validation
Offers a standalone mode along with the GUI, which both allow sending and receiving NDEF messages
圖4.MSP430F5529實驗板和TRF7970ATB硬件
圖5.近場通信(NFC)收發器參考設計電路
NFC有源和無源P2P通信參考設計材料清單:
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