The default I2C address is 0x60.

Power Pins

• VIN - this is the power pin. Since the clock generator chip may use 3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V.
• 3Vo - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like.
• GND - common ground for power and logic.

I2C Logic Pins

• SCL - I2C clock pin, connect to your microcontroller I2C clock line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
• SDA - I2C data pin, connect to your microcontroller I2C data line. This pin is level shifted so you 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.

Clock Out Pins

• 0, 1, and 2 - These are the 3 independent clock generated outputs. They are square waves, from 0-3V.

Clock output 1 is also brought out to an SMA edge-launch connector on the other side of the PCB. You can purchase and solder on an edge-launch SMA connector if you want to pipe the signal into an RF cable.

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 the green LED.
• LED jumper - This jumper is located on the back of the board. Cut the trace on this jumper to cut power to the "on" LED.