The default I2C address is 0x29.

Power Pins

• VIN - This is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V.
• GND - This is common ground for power and logic.

I2C Logic Pins

• SCL - I2C clock pin, connect to your microcontroller's I2C clock line. This pin can use 3-5V logic, and there's a 10K pullup on this pin.
• SDA - I2C data pin, connect to your microcontroller's I2C data line. This pin can use 3-5V logic, and there's a 10K pullup on this pin.
• STEMMA QT - These connectors allow you to connectors to dev boards with STEMMA QT connectors or to other things with various associated accessories

Other Pins

• INT -  the interrupt pin. It is an open-drain interrupt.
• EN - the enable pin. The pin is active high. If you pull the pin low, it turns off the TMF8801 and all memory content is lost
• IO0 and IO1 - these are general purpose input and output pins. They default to output low. They are 3V tolerant only!

Power LED and LED Jumper

• Power LED - In the upper left corner, above the STEMMA connector, on the front of the board, is the power LED, labeled on. It is a green LED.
• LED jumper - This jumper is located on the front of the board, the the right of the LED. Cut the trace on this jumper to cut power to the "on" LED.