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.
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.
Common ground for power and logic.
I2C clock pin. Connect to the microcontroller I2C clock line; the board has a 10K pullup on this pin.
I2C data pin. Connect to the microcontroller I2C data line; the board has a 10K pullup on this pin.
STEMMA QT / Qwiic connector path for I2C connection to compatible development boards or accessories.
General purpose output configurable to provide RF activity information. Adafruit notes it needs an external pullup resistor above 4.7 kΩ.
Analog energy-harvesting voltage output available when energy harvesting is enabled and RF field strength is sufficient. Adafruit notes this voltage is not regulated.
| Pin | 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 | I2C | I2C clock pin. Connect to the microcontroller I2C clock line; the board has a 10K pullup on this pin. | |
| SDA | I2C | I2C data pin. Connect to the microcontroller I2C data line; the board has a 10K pullup on this pin. | |
| STEMMA QT | Unknown | 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 |
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.
Common ground for power and logic.
I2C clock pin. Connect to the microcontroller I2C clock line; the board has a 10K pullup on this pin.
I2C data pin. Connect to the microcontroller I2C data line; the board has a 10K pullup on this pin.
STEMMA QT / Qwiic connector path for I2C connection to compatible development boards or accessories.
General purpose output configurable to provide RF activity information. Adafruit notes it needs an external pullup resistor above 4.7 kΩ.
Analog energy-harvesting voltage output available when energy harvesting is enabled and RF field strength is sufficient. Adafruit notes this voltage is not regulated.
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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