The Adafruit ST25DV16K I2C RFID EEPROM Breakout is a unique NFC solution that combines traditional RFID functionality with the flexibility of I2C reprogramming. Acting as an ISO/IEC 15693 NFC Forum Type 5 tag, it can be read by most mobile phones and tablets while also offering direct reprogrammability from a microcontroller. With 16Kb of EEPROM memory, this module allows you to write and update data such as URLs or IDs dynamically over I2C. It supports fast transfer mode, enabling quick data exchanges between RF and I2C interfaces, making it suitable for advanced wireless data projects. The breakout includes a PCB antenna, standard 2.54mm headers, and STEMMA QT/Qwiic connectors for quick, solder-free setup. Designed with durability in mind, the ST25DV16K ensures up to 1 million write cycles and 40-year retention, making it perfect for smart tags, IoT applications, and dynamic NFC projects. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Dual Interface – ISO/IEC 15693 NFC tag with I2C reprogrammability.
Dynamic Updates – Reprogram tag contents via I2C for flexible applications.
EEPROM Memory – 16Kb capacity with high endurance (up to 1M cycles).
Fast Transfer Mode – Enables rapid I2C-to-RF data exchange.
Cross-Platform – Readable by Android and iOS NFC-enabled devices.
User-Friendly Breakout – Includes PCB antenna, 0.1" headers, and STEMMA QT connectors.
Reliable Performance – 40-year data retention and robust write cycles.
Wide Voltage Range – Operates on 1.8V–5.5V with I2C up to 1MHz.
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Applications:
Smart NFC Tags – Store and dynamically update links, IDs, or product data.
IoT Projects – Wireless communication bridge between microcontrollers and mobile devices.
Access & Authentication – Use for secure, password-protected tag systems.
Data Logging – Store sensor data and retrieve it wirelessly via NFC.
Educational Tools – Demonstrates EEPROM, NFC, and I2C integration for learners.
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| General Specifications |
| Product Model | Adafruit ST25DV16K I2C RFID EEPROM Breakout |
| Memory | 16Kb EEPROM |
| Frequency | 13.56MHz (ISO/IEC 15693, NFC Type 5) |
| Interfaces | I2C (1MHz max), RF (ISO15693) |
| I2C Addresses | 0x2D, 0x53 (user), 0x57 (system) |
| Supply Voltage | 1.8V – 5.5V |
| Write Cycles Endurance | 1M @ 25°C, 600k @ 85°C, 500k @ 105°C |
| Data Retention | 40 years |
| Transfer Mode | Fast transfer between I2C and RF |
| Security | Configurable passwords for read/write protection |
| Dimensions | 31.7 × 25.3 × 4.6 mm |
| Connectors | PCB antenna, 2.54mm headers, STEMMA QT/Qwiic |
| Shipment Weight | 0.0042 kg |
| Shipment Dimensions | 3 × 3 × 2 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
I2C interface
- Two-wire I2C serial interface supports 1MHz protoc
- Uses multiple I2C addresses 0x2D, 0x53 (user memory) and 0x57 (system memory)
- Single supply voltage: 1.8V to 5.5V
- Multiple byte write programming (up to 256 bytes)
Contactless interface
- Based on ISO/IEC 15693
- NFC Forum Type 5 tag certified by the NFC Forum
- Supports all ISO/IEC 15693 modulations, coding, sub-carrier modes and data rates
- Custom fast read access up to 53 Kbit/s
- Single and multiple blocks read (same for Extended commands)
- Single and multiple blocks write (up to 4) (same for Extended commands)
- Internal tuning capacitance: 28.5 pF
Memory
- 16-kbits of EEPROM
- I2C interface accesses bytes
- RF interface accesses blocks of 4 bytes
Write time:
- From I2C: typical 5ms for 1 byte
- From RF: typical 5ms for 1 block
- Data retention: 40 years
Write cycles endurance:
- 1 million write cycles at 25 °C
- 600k write cycles at 85 °C
- 500k write cycles at 105 °C
- 400k write cycles at 125 °C
Fast transfer mode
- Fast data transfer between I2C and RF interfaces
- Half-duplex 256-byte dedicated buffer
Energy harvesting
- Analog output pin to power external components
Data protection
- User 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
- System configuration: protected in write by a 64-bit password in RF and a 64-bit password in I2C
Revision History:
- As of Nov 1, 2023 – we've updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen - you may get the new PCB or the older version with vector fonts - both are identical other than the fancy silkscreen.
Package Includes:
1 x Adafruit ST25DV16K I2C RFID EEPROM Breakout
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