Tinker Tailor
Adafruit RFID tag: ST25DV16K I2C EEPROM Breakout
Adafruit RFID tag: ST25DV16K I2C EEPROM Breakout
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A unique RFID/NFC breakout built around the ST25DV04 chip — it shows up as an ISO/IEC 15693 (13.56MHz) tag readable by phones and tablets, but unlike standard passive tags it can be reprogrammed over I2C from a microcontroller. This makes it ideal for dynamic applications where you want to update the tag's content in real time.
Ships next business day from Nova Scotia · 30-day returns · Questions? cmoz@tinkertailor.ca
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Details
For example: a microcontroller can write different URLs a few seconds apart, and a phone will detect each one in sequence. Includes a PCB trace antenna, STEMMA QT connector (SparkFun Qwiic compatible), and standard 2.54mm headers for breadboard use.
Important notes:
- Popular hobby RFID chips like the PN532 do not support ISO15693 — you cannot use those to read the ST25DV once programmed
- Requires a SAMD-based board (Metro M0 or better) — Arduino UNO (ATmega328p) does not have enough RAM
- No CircuitPython library available — Arduino only
- QT cable not included
- ST Arduino library for writing NFC URLs over I2C
I2C Interface
- 1MHz I2C protocol, addresses 0x2D, 0x53 (user memory), 0x57 (system memory)
- Supply voltage: 1.8V – 5.5V
- Multiple byte write up to 256 bytes
Contactless Interface
- ISO/IEC 15693, NFC Forum Type 5 certified
- Fast read up to 53 Kbit/s
- Internal tuning capacitance: 28.5pF
Memory
- 16Kbit EEPROM | Data retention: 40 years
- Write endurance: 1M cycles @ 25°C
- Energy harvesting: analog output pin to power external components
Dimensions: 31.7 × 25.3 × 4.6mm
Related products
- Need a standard RC522 reader? See the RFID RC522 Board and Tags.
- Want flat card-style tags? Try the Black 13.56MHz RFID Tag.
- Need a SAMD board to drive it? See the Adafruit Gemma M0 or QT Py SAMD21.
