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
  • 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's 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's 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
  • AD0 - I2C Address pin and jumper. Pulling this pin high or bridging the solder jumper on the back will change the I2C address from 0x68 to 0x69

SPI Logic pins:

All pins going into the breakout have level shifting circuitry to make them 3-5V logic level safe. Use whatever logic level is on Vin!

  • SCL (SCK)- This is also the SPI Clock pin, it's an input to the chip
  • SDA (MOSI) - this is also the Serial Data In / Microcontroller Out Sensor In pin, for data sent from your processor to the sensor
  • AD0 (MISO) - this is the Serial Data Out / Microcontroller In Sensor Out pin, for data sent from the sensor to your processor. 
  • CS - this is the Chip Select pin, drop it low to start an SPI transaction. Its an input to the chip

If you want to connect multiple ICM20649's to one microcontroller, have them share the SDA, SDO and SCL pins. Then assign each one a unique CS pin.

Other Pins

  • INT1 -The first interrupt pin. You can setup the ICM20649 to pull this low when certain conditions are met such as a value exceeding a threshold. Consult the datasheet for usage
  • INT2 -The second interrupt pin. You can setup the ICM20649 to pull this low when certain conditions are met such as a value exceeding a threshold. Consult the datasheet for usage
  • FSYNC_IN - Used to sync the sensor with an external source. Consult the datasheet for usage. Connected to GND by default. Cut the jumper on the bottom of the breakout to use the external pin
  • SDE, SCE Pins for advanced users to connect the ICM20649 to another, external I2C sensor. Consult the datasheet for usage

This guide was first published on Mar 02, 2020. It was last updated on Mar 02, 2020.

This page (Pinouts) was last updated on Dec 01, 2021.

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