{"product_id":"adafruit-st25dv16k-i2c-rfid-eeprom-breakout-stemma-qt-qwiic","title":"Adafruit ST25DV16K I2C RFID EEPROM Breakout","description":"\u003cp\u003eThis RFID tag is really unique: it works with mobile phones just like other RFID tags, but you can reprogram it over I2C.\u003c\/p\u003e\n\u003cp\u003eThe tag shows up as an ISO\/IEC 15693 (13.56MHz) chip which is readable by phones and tablets. This could be interesting in situations where you want a  tag that can be re-written dynamically when connected to a controller. For example, Adafruit did a test where they had a microcontroller write different URLs a few seconds apart, and the mobile phone detected the different URLs one after the other.\u003c\/p\u003e\n\u003cp\u003eNote that the most popular hobby \u003ca href=\"\/en-eu\/?q=pn532\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eRFID reader\/writer chips like the PN532\u003c\/a\u003e do \u003cstrong\u003enot\u003c\/strong\u003e support ISO15693 so you cannot use those to read the ST25DV tag once programmed! Adafruit used both Apple and Android phones with success to read the tags.\u003c\/p\u003e\n\u003cp\u003eAccording to the datasheet, one can even use it as a 'I2C to RFID' transfer system to wirelessly send and receive data from mobile devices (you'll need to write a custom app for that kind of project, though).\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/github.com\/stm32duino\/ST25DV\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eST has written a handy library that you can easily use to write NFC URLs to the chip over I2C\u003c\/a\u003e. \u003cstrong\u003eYou cannot use an Arduino UNO (ATmega328p) with the ST25DV library, there's not enough RAM\u003c\/strong\u003e. Please use a Metro M0 or other SAMD chip (or better) to communicate with the ST25DV.  There's no Python or CircuitPython library for this chip at this time, only Arduino.\u003c\/p\u003e\n\u003cp\u003eTo make connections easy, this breakout contains an ST25DV04 chip, support circuitry and even a PCB trace antenna. There's standard 0.100”\/ 2.54mm pitch headers for use with a breadboard. Should you wish to avoid soldering, the breakout also includes \u003cstrong\u003e\u003ca href=\"http:\/\/adafruit.com\/stemma\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eStemma QT\u003c\/a\u003e\u003c\/strong\u003e connectors (\u003ca href=\"https:\/\/www.sparkfun.com\/qwiic\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSparkFun Qwiic\u003c\/a\u003e compatible). Using these handy connectors you can simply plug in the sensor and get rolling with your project.\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL DETAILS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eI2C interface\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTwo-wire I2C serial interface supports 1MHz protocol\u003c\/li\u003e\n\u003cli\u003eUses multiple I2C addresses \u003cstrong\u003e0x2D, 0x53\u003c\/strong\u003e (user memory) \u003cstrong\u003eand 0x57\u003c\/strong\u003e (system memory)\u003c\/li\u003e\n\u003cli\u003eSingle supply voltage: 1.8V to 5.5V\u003c\/li\u003e\n\u003cli\u003eMultiple byte write programming (up to 256 bytes)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eContactless interface\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBased on ISO\/IEC 15693\u003c\/li\u003e\n\u003cli\u003eNFC Forum Type 5 tag certified by the NFC Forum\u003c\/li\u003e\n\u003cli\u003eSupports all ISO\/IEC 15693 modulations, coding, sub-carrier modes and data rates\u003c\/li\u003e\n\u003cli\u003eCustom fast read access up to 53 Kbit\/s\u003c\/li\u003e\n\u003cli\u003eSingle and multiple blocks read (same for Extended commands)\u003c\/li\u003e\n\u003cli\u003eSingle and multiple blocks write (up to 4) (same for Extended commands)\u003c\/li\u003e\n\u003cli\u003eInternal tuning capacitance: 28.5 pF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMemory\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e16-kbits of EEPROM\u003c\/li\u003e\n\u003cli\u003eI2C interface accesses bytes\u003c\/li\u003e\n\u003cli\u003eRF interface accesses blocks of 4 bytes\u003c\/li\u003e\n\u003cli\u003eWrite time:\n\u003cul\u003e\n\u003cli\u003eFrom I2C: typical 5ms for 1 byte\u003c\/li\u003e\n\u003cli\u003eFrom RF: typical 5ms for 1 block\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eData retention: 40 years\u003c\/li\u003e\n\u003cli\u003eWrite cycles endurance:\n\u003cul\u003e\n\u003cli\u003e1 million write cycles at 25 °C\u003c\/li\u003e\n\u003cli\u003e600k write cycles at 85 °C\u003c\/li\u003e\n\u003cli\u003e500k write cycles at 105 °C\u003c\/li\u003e\n\u003cli\u003e400k write cycles at 125 °C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFast transfer mode\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFast data transfer between I2C and RF interfaces\u003c\/li\u003e\n\u003cli\u003eHalf-duplex 256-byte dedicated buffer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEnergy harvesting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAnalog output pin to power external components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eData protection\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUser memory: 1 to 4 configurable areas, protectable in read and\/or write by three 64-bit passwords in RF and one 64-bit password in I2C\u003c\/li\u003e\n\u003cli\u003eSystem configuration: protected in write by a 64-bit password in RF and a 64-bit password in I2C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProduct Dimensions: 31.7mm x 25.3mm x 4.6mm \/ 1.2\" x 1.0\" x 0.2\"\u003c\/p\u003e\n","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":32157529702483,"sku":"ADA4701","price":3.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4701-00.jpg?v=1597152722","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-st25dv16k-i2c-rfid-eeprom-breakout-stemma-qt-qwiic","provider":"Pimoroni Ltd","version":"1.0","type":"link"}