Adafruit ST25DV16K I2C RFID EEPROM Breakout - STEMMA QT / Qwiic
ST25DV16K dual-interface RFID/NFC tag breakout: readable by phones as an ISO/IEC 15693 (13.56 MHz) tag, and rewritable over I2C from a microcontroller. STEMMA QT / Qwiic connector; 16 Kbit EEPROM.
Pinout
- Vin
Board power input. Adafruit Learn states the chip can safely run from 3-5VDC and should be powered at the same voltage as the host logic level.
Type · powerVoltage · 3V to 5V DC - GND
Common ground for power and logic.
Type · groundVoltage · 0V - SCL
I2C clock pin. Connect to the microcontroller I2C clock line; the board has a 10K pullup on this pin.
Type · signal - SDA
I2C data pin. Connect to the microcontroller I2C data line; the board has a 10K pullup on this pin.
Type · signal - STEMMA QT
STEMMA QT / Qwiic connector path for I2C connection to compatible development boards or accessories.
Type · connector - GPO
General purpose output configurable to provide RF activity information. Adafruit notes it needs an external pullup resistor above 4.7 kΩ.
Type · signal - VEH
Analog energy-harvesting voltage output available when energy harvesting is enabled and RF field strength is sufficient. Adafruit notes this voltage is not regulated.
Type · powerVoltage · unregulated energy-harvesting output
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| Vin | power | Board power input. Adafruit Learn states the chip can safely run from 3-5VDC and should be powered at the same voltage as the host logic level. | 3V to 5V DC | |
| GND | ground | Common ground for power and logic. | 0V | |
| SCL | signal | I2C clock pin. Connect to the microcontroller I2C clock line; the board has a 10K pullup on this pin. | ||
| SDA | signal | I2C data pin. Connect to the microcontroller I2C data line; the board has a 10K pullup on this pin. | ||
| STEMMA QT | connector | STEMMA QT / Qwiic connector path for I2C connection to compatible development boards or accessories. | ||
| GPO | signal | General purpose output configurable to provide RF activity information. Adafruit notes it needs an external pullup resistor above 4.7 kΩ. | ||
| VEH | power | Analog energy-harvesting voltage output available when energy harvesting is enabled and RF field strength is sufficient. Adafruit notes this voltage is not regulated. | unregulated energy-harvesting output |
Start wiring
I2C · UART · SPI · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: Vin, VEH, GND, SCL, SDA, GPO. Schematik maps them to your board in the app.
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