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[原创] ST ST25R3911B高性能HF读卡器和NFC发起设备解决方案

关键词:NFC HF读卡器 电子政务 接入控制 ST25R3911B

时间:2017-10-12 10:30:58       作者:ST       来源:中电网

ST公司的ST25R3911B是具有1.4W支持VHBR和AAT的高性能HF读卡器和NFC发起设备,包括了模拟前端(AFE)和高度集成数据帧系统,用于ISO 18092(NFCIP-1)发起设备,ISO 18092(NFCIP-1)主动目标设备,ISO 14443A和B读卡器,ISO 15693读卡器和FeliCa™读卡器.工作电压2.4 V- 5.5 V,工作温度-40℃- 125℃ ,主要用在EMV支付,电子政务,接入控制,NFC基础设施和票务.本文介绍了ST25R3911B主要特性,框图,接收器框图和应用配置图,以及Discovery套件ST25R3911B-DISCO主要特性,框图,电路图,材料清单和PCB设计图.

适用于诸如门禁、票务、工业、医疗及消费等用户要求最佳RF性能和灵活性以及低功耗的各种应用

The ST25R3911B is a highly integrated NFC Initiator / HF Reader IC, including the analog front end (AFE) and a highly integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high bit rates), ISO 15693 reader and FeliCa™ reader. Implementation of other standard and custom protocols like MIFARE™ Classic is possible using the AFE and implementing framing in the external microcontroller (Stream and Transparent modes).

The ST25R3911B is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power.

Thanks to automatic antenna tuning (AAT) technology, the device is optimized for applications with directly driven antennas. The ST25R3911B is alone in the domain of HF reader ICs as it contains two differential low impedance (1 Ohm) antenna drivers.

The ST25R3911B includes several features that make it very suited for low power applications. It contains a low power capacitive sensor that can be used to detect the presence of a card without switching on the reader field. The presence of a card can also be detected by performing a measurement of amplitude or phase of signal on antenna LC tank, and comparing it to the stored reference. It also contains a low power RC oscillator and wake-up timer that can be used to wake up the system after a defined time period, and to check for the presence of a tag using one or more low power detection techniques (capacitive, phase or amplitude).

The ST25R3911B is designed to operate from a wide (2.4 V to 5.5 V) power supply range; peripheral interface IO pins support power supply range from 1.65 V to 5.5 V.

ST25R3911B主要特性:

• ISO 18092 (NFCIP-1) Active P2P
• ISO14443A, ISO14443B, ISO15693 and FeliCa™
• Supports VHBR (3.4 Mbit/s PICC to PCD framing, 6.8 Mbit/s AFE and PCD to PICC framing)
• Capacitive sensing
- Wake-up
• Automatic antenna tuning system providing tuning of antenna LC tank
• Automatic modulation index adjustment
• AM and PM (I/Q) demodulator channels with automatic selection
• DPO (Dynamic Power Output)
• Up to 1.4 W in case of differential output
• User selectable and automatic gain control
• Transparent and Stream modes to implement MIFARE™ Classic compliant or other custom protocols
• Possibility of driving two antennas in single ended mode
• Oscillator input capable of operating with 13.56 MHz or 27.12 MHz crystal with fast start-up
• 6 Mbit/s SPI with 96 bytes FIFO
• Wide supply voltage range from 2.4 V to 5.5 V
• Wide temperature range: -40℃ to 125℃
• QFN32, 5 mm x 5 mm package

ST25R3911B应用:

• EMV payment
• E-government
• Access control
• NFC infrastructure
• Ticketing

图1.ST25R3911B框图

图2.ST25R3911B接收器框图

图3.ST25R3911B带单片天线驱动(包括EMC滤波器)最低配置图

图4.ST25R3911B带差分天线驱动(包括EMC滤波器)最低配置图

Discovery套件ST25R3911B-DISCO

Discovery kit for the ST25R3911B high performance HF reader / NFC initiator The ST25R3911B-DISCO is a ready-to-use development kit to evaluate the functions of the high performance HF reader / NFC initiator ST25R3911B in Reader mode for contactless applications.

The ST25R3911B-DISCO kit supports
• ISO 18092 (NFCIP-1) active P2P
• ISO 14443A and ISO14443B
• ISO 15693
• FeliCa™
• VHBR, with 6.8 Mbit/s PCD to PICC framing and 3.4 Mbit/s PICC to PCD framing
• Up to 1.4 W output power with differential antenna
• Possibility of driving two antennas in single ended mode, with automatic antenna tuning (AAT) system
• Inductive and capacitive Wake-up
• User selectable and automatic gain control
• Transparent and Stream modes to implement MIFARE® Classic compliant or other custom protocols

Discovery套件ST25R3911B-DISCO包括:

• the STM32L476RET6, a 32-bit microcontroller with 512 KB of Flash memory
• a 105 mm x 52 mm, two turns antenna etched on the PCB, and its VHBR tuning circuit
• a Micro-USB connector for communication with the host PC and board powering
• six LEDs indicating the presence of the RF field and of the protocol used to communicate


图5.Discovery套件ST25R3911B-DISCO外形图(正面)

图6.Discovery套件ST25R3911B-DISCO框图

图7.Discovery套件ST25R3911B-DISCO电路概述

图8.Discovery套件ST25R3911B-DISCO电路图:USB接口

图9.Discovery套件ST25R3911B-DISCO电路图:STM32L476

图10.Discovery套件ST25R3911B-DISCO电路图:ST25R3911B

图11.Discovery套件ST25R3911B-DISCO电路图:天线和匹配网络
Discovery套件ST25R3911B-DISCO材料清单:


图12.Discovery套件ST25R3911B-DISCO PCB设计图(1)

图13.Discovery套件ST25R3911B-DISCO PCB设计图(2)

图14.Discovery套件ST25R3911B-DISCO PCB设计图(3)

图15.Discovery套件ST25R3911B-DISCO PCB设计图(4)

图16.Discovery套件ST25R3911B-DISCO PCB设计图(5)
详情请见:
http://www.st.com/content/ccc/resource/technical/document/datasheet/group3/ba/60/79/
5c/bb/a9/41/76/DM00321525/files/DM00321525.pdf/jcr:content/translations/en.DM00321525.pdf

http://www.st.com/content/ccc/resource/technical/document/user_manual/group0/32/d7/
3f/14/03/1c/45/75/DM00280466/files/DM00280466.pdf/jcr:content/translations/en.DM00280466.pdf

以及http://www.st.com/content/ccc/resource/technical/layouts_and_diagrams/schematic_pack/group0/71/e3/fd/6c/0c/db/42/21/Schematics-ST25R3911B-DISCO-MB1325/files/Schematics-ST25R3911B-DISCO-MB1325.PDF/jcr:content/translations/en.Schematics-ST25R3911B-DISCO-MB1325.PDF
http://www.st.com/content/ccc/resource/technical/document/bill_of_materials/group0/42/fb/f2/a6/cc/e0/43/0b/Bill_Of_Materials_ST25R3911B-DISCO/files/BOM-ST25R3911B-DISCO.PDF/jcr:content/translations/en.BOM-ST25R3911B-DISCO.PDF
en.BOM-ST25R3911B-DISCO.PDF
en.DM00321525.pdf
en.DM00280466.pdf
en.Schematics-ST25R3911B-DISCO-MB1325.PDF

 

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