Power Pins

• VIN - this is the power pin. Since the sensor chip uses 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
• 1V8 - this is the 1.8V 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
• SDO/ADR Jumper - I2C Address pin. Pulling this pin high or bridging the solder jumper on the back will change the I2C address from 0x69 to 0x68

SPI Logic pins

• SCL - This is also the SPI Clock pin / SCK, it's an input to the chip
• SDA - this is also the Serial Data In / Microcontroller Out Sensor In / MOSI pin, for data sent from your processor to the ICM20948
• SDO - this is the Serial Data Out / Microcontroller In Sensor Out / MISO pin, for data sent from the ICM20948 to your processor. 
• CS - this is the Chip Select pin, drop it low to start an SPI transaction. It's an input to the chip

If you want to connect multiple ICM20948s to one microcontroller, have them share the SCL, SDA, and DO pins. Then assign each one a unique CS pin.

Other Pins

• INT -This is the primary interrupt pin. You can setup the ICM20948 to pull this low or high when certain conditions are met such as new measurement data being available. Consult the datasheet for usage
• AC - Auxillary I2C bus clock. Advanced users can consult the datasheet to learn how to use this pin to communicate with sensors on the ICM20948's auxillary bus. 1.8V Logic Only!
• AD - Auxillary I2C bus data. Advanced users can consult the datasheet to learn how to use this pin to communicate with sensors on the ICM20948's auxillary bus. 1.8V Logic Only!
• FS - External frame sync. Advanced users can consult the datasheet to learn how to use this pin to synchronize measurements with additional sensors. 1.8V Logic Only!