The default I2C address is 0x58.

Power Pins

• VCC - this is the power pin. Since the DAC chip uses 3-5 VDC 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.
  
• +12V - this is the 12V output from the small on-board DC/DC converter. You can grab up to 100mA if you need to power something externally.
• GND - 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

DAC Outputs

• OUT0/V0 and OUT1/V1 - The analog voltage outputs from the DAC. They are available along the bottom edge of the board (OUT0 and OUT1) or via the terminal block (V0 and V1). You can get an output of 0-5V or 0-10V, with an output voltage error of 0.2%. Note that the DAC outputs have 10uF caps on them (as indicated by the datasheet), so they aren't going to be terribly fast.

Address Pins

On the back of the board are three address jumpers, labeled A0, A1, and A2. These jumpers allow you to chain up to 8 of these boards on the same pair of I2C clock and data pins. To do so, you solder the jumpers "closed" by connecting the two pads.

The default I2C address is 0x58. The other address options can be calculated by “adding” the A0/A1/A2 to the base of 0x58.

A0 sets the lowest bit with a value of 1, A1 sets the next bit with a value of 2 and A2 sets the next bit with a value of 4. The final address is 0x58 + A2 + A1 + A0 which would be 0x5F.


So for example if A2 is soldered closed and A0 is soldered closed, the address is 0x58 + 4 + 1 = 0x5D.


If only A0 is soldered closed, the address is 0x58 + 1 = 0x59


If only A1 is soldered closed, the address is 0x58 + 2 = 0x5A


If only A2 is soldered closed, the address is 0x58 + 4 = 0x5C

The table below shows all possible addresses, and whether the jumper(s) should be high (closed) or low (open).

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, labeled LED on the board silk, is located on the back of the board, on the right. Cut the trace on this jumper to cut power to the "on" LED.