• Vin - this is the power pin. Since the sensor chip uses 3VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it to 3VDC. 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.
• 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

• SCK/SCL - the I2C clock pin, connect to your microcontroller's I2C clock line.
• SDI/SDA - the I2C data pin, connect to your microcontroller's I2C data line.
• STEMMA QT - These connectors allow you to connectors to dev boards with STEMMA QT connectors or to other things with various associated accessories

Leave the CS pin disconnected for I2C use.

The SDO pin is also the I2C address select pin. Connecting this pin to GND will make the I2C address 0x76 instead of the default 0x77.

On the back of the SPA06-003 breakout there is an addr jumper for the SDO pin that can be soldered closed to change the I2C address to 0x76 more permanently.

If this jumper is not soldered closed then the I2C address will be 0x77.

• SCK - This is the SPI Clock or SCK pin, its an input to the chip and can use 3 - 5V logic.
• SDO - this is the Serial Data Out / Microcontroller In Sensor Out pin, for data sent from the SPA06-003 to your processor.
• SDI - this is the Serial Data In / Microcontroller Out Sensor In pin, for data sent from your processor to the SPA06-003. Its an input to the chip and can use 3 - 5V logic.
• CS - this is the Chip Select pin, drop it low to start an SPI transaction. It's an input to the chip and can use 3 - 5V logic.

On the top left of the board between the left STEMMA QT connector and mounting hole is a small power LED that will turn on whenever adequate power is being provided to the breakout.