MIKROE-2395

NFC click 1 NFC click NFC click NFC click IC/Module PN7120 datasheet [1] Interface I2C Power supply 3.3V Product page www.mikroe.com/click/NFC Schematic NFC click schematic [2] [3] NFC click is a an add-on board with a versatile near field communications controller from NXP — the PN7120 IC. NFC devices are used in contactless payment systems, electronic ticketing, smartcards, but also in retail and advertising — inexpensive NFC tags can be embedded into packaging labels, flyers or posters. This board has full compliancy with NFC Forum specifications which means that you will be able to use the full potential of NFC and its three distinct operating modes. Features and usage notes NFC is designed to be intuitive for users. Communication between two devices is established in the simplest way possible — by bringing them close to each other. The standards are dictated by the NFC Forum. NFC frontends, like the one on this click, can operate in three distinct modes: 1. Card emulation mode — where NFC click behaves like a smartcard or a tag In this mode, NFC click emulates an NFC tag. It doesn’t initiate the communication, it only responds to an NFC reader. A typical application of the card emulation mode is how people use NFC in their smartphones to replace several cards, badges and tags at once (using the same phone for tollgate checkins, contactless payments and so on). Card emulation mode, however, is not useful just for smartphones, but for any type of portable device. 2. Read/Write — where NFC click behaves as an NFC Reader Here, NFC click communicates with a passive tag, smartcard, or an NFC device operating in card emulation mode. It can both read or write to a tag (although reading is a more common use-case because tags will often be write protected). In this mode, it is NFC click that generates the RF field, while a tag or card only modulates it. NFC click 3. Peer-to-peer — for more complex interactions Peer-to-peer mode establishes a two-way communication channel between a pair of NFC-enabled devices. More complex interactions are possible in this mode, such as simplifying bluetooth pairing. When a user brings two devices close to each other, the two NFC chips establish a P2P connection and exchange data that facilitates the Bluetooth pairing, seamlessly — the user doesn’t have to type passwords or set configurations. The following diagram shows the protocols that correspond to each operating mode: RF protocols supported: • NFCIP-1, NFCIP-2 protocol • ISO/IEC 14443A, ISO/IEC 14443B PICC mode via host interface • ISO/IEC 14443A, ISO/IEC 14443B PCD designed according to NFC Forum digital protocol T4T platform and ISO-DEP • FeliCa PCD mode • MIFARE PCD encryption mechanism (MIFARE 1K/4K) • NFC Forum tag 1 to 4 (MIFARE Ultralight, Jewel, Open FeliCa tag, DESFire) • ISO/IEC 15693/ICODE VCD mode Supported host interfaces: • NCI protocol interface according to NFC Forum standardization • I2C-bus High-speed mode Additional notes Note that NFC is a subset of RFID working on 13.54 MHz. Therefore, an NFC IC can read/write ISO14443 RFID tags, and vice verca — compatible RFID readers (such as RFID click can read NFC tags or NFC devices functioning in card emulation mode. The board has one SMD Jumper (ADDR SEL.) which is used to determine the I2C address. By default is on 0. 2 NFC click 3 Pinout diagram This table shows how the pinout on NFC click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes mikroBUStm NC Reset of the PN7120 RST 1 AN X PWM 16 NC 2 RST INT 15 INT NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 SCL NC 6 MOSI SDA 11 SDA I2C-bus serial data +3.3V power input +3.3V 7 +3.3V +5V 10 NC Ground GND GND 9 8 GND Interrupt request output I2C-bus serial clock input This click supports 3.3V only GND Ground Programming The Libstock example shows the Read/Write and Card Emulation modes of NFC click. A tag or phone is detected when it approaches the field of NFC click (2-3cm). The example is available for both clicker 2 and Hexiwear. const char NDEF_RECORD[] = { 0xD1, // MB / ME / CF / 1 / IL / TNF 0x01, // TYPE LENGTH 51, // PAYLOAD LENTGH 'T', // TYPE 0x02, // Status 'e', 'n', // Language 13, 10, 13, 10, 32, 32, 32, 32, 32, 'M', 'i', 'k', 'r', 'o', 'E', 'l', 'e', 'k', 't', 'r', 'o', 'n', 'i', 'k', 'a', 13, 10, 13, 10, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 'N', 'F', 'C', ' ', 'c', 'l', 'i', 'c', 'k' }; Code examples for NFC click, written for MikroElektronika hardware and compilers are available on Libstock [4]. NFC click Resources • • • • PN7120 data sheet [1] Demo code / Library [4] RFID tutorial (relevant to NFC as well) [5] mikroBUS™ standard specifications [6] References [1] [2] [3] [4] [5] [6] http:/ / www. nxp. com/ documents/ data_sheet/ PN7120. pdf http:/ / www. mikroe. com/ click/ nfc/ http:/ / cdn-docs. mikroe. com/ images/ f/ ff/ Nfc-click-schematic_v101. pdf http:/ / libstock. mikroe. com/ projects/ view/ 1943/ nfc-click http:/ / learn. mikroe. com/ what-is-rfid/ http:/ / www. mikroe. com/ mikrobus/ 4 Article Sources and Contributors Article Sources and Contributors NFC click  Source: http://docs.mikroe.com/index.php?oldid=1894  Contributors: Andrea.galizia, Srdjan.misic Image Sources, Licenses and Contributors File:Nfc-click-front-shop-crop.jpg  Source: http://docs.mikroe.com/index.php?title=File:Nfc-click-front-shop-crop.jpg  License: unknown  Contributors: Vojislav.gvozdic File:PN7120 modes.png  Source: http://docs.mikroe.com/index.php?title=File:PN7120_modes.png  License: unknown  Contributors: Srdjan.misic File:mikrobus logo.png  Source: http://docs.mikroe.com/index.php?title=File:Mikrobus_logo.png  License: unknown  Contributors: Vojislav.gvozdic License Creative Commons Attribution https:/ / creativecommons. org/ licenses/ by/ 4. 0/ 5