Qwiic Dynamic NFC/RFID Tag

The Qwiic Dynamic NFC/RFID Tag is built around the STMicroelectronics ST25DV64KC, a dual-interface NFC/RFID tag IC with 64-kbit (8 KB) of EEPROM. The memory is accessible over both I²C and RF (NFC), meaning you can read and write tag data from a microcontroller via I²C and from a smartphone via NFC — even when the board is powered off.

The tag conforms to ISO/IEC 15693 and is NFC Forum Type 5 certified. Its EEPROM can be divided into up to four areas with independent read/write protection and password control, giving you fine-grained access management for different data types.

Key Features

• Dual Interface – Access memory via I²C (from a microcontroller) or RF/NFC (from a smartphone)
• 64-kbit EEPROM – 8 KB of non-volatile storage with 40-year data retention
• NFC Forum Type 5 Certified – ISO/IEC 15693 compliant
• NDEF Record Support – Read/write URI, Wi-Fi credential, and text records via the Arduino library
• Password-Protected Areas – Up to four configurable memory zones with independent access control
• Energy Harvesting – Can harvest energy from the NFC RF field
• GPO Interrupt Pin – Configurable on multiple RF and I²C events
• Qwiic I²C Connector – Plug-and-play wiring to compatible controllers

Specifications

• Tag IC – STMicroelectronics ST25DV64KC
• Memory – 64-kbit (8 KB) EEPROM
• RF Standard – ISO/IEC 15693, NFC Forum Type 5
• RF Read Speed – Up to 53 kbit/s (fast read)
• Write Time – ~5 ms (1–16 bytes via I²C, 1 block via RF)
• Write Endurance – 400,000–1,000,000 cycles
• Data Retention – 40 years
• Supply Voltage – 1.8–5.5 V (Qwiic bus operates at 3.3 V)
• I²C Addresses – User: 0x53, System: 0x57, RF Off: 0x51, RF On: 0x55

Ideal For

• Storing data via I²C and reading it back with a smartphone (even when powered off)
• Writing Wi-Fi credentials from a phone to configure IoT devices
• Interactive posters and NFC-enabled product packaging
• Diagnostic data logging accessible by field technicians

Compatible Apps

Tested with ST's "NFC Tap" app, available on the Apple App Store and Google Play.

Resources

• Arduino Library Documentation
• Arduino Library (GitHub)
• Hardware Design Files (GitHub)
• Schematic (PDF)
• Board Dimensions
• Eagle Files

Package Contents

• 1× Qwiic Dynamic NFC/RFID Tag Board