Power Pins

  • Vin - this is the power pin. Since the sensor chip uses 3.3 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

Other Common Pins

  • IA1 - Tthe accelerometer's first interrupt pin. 3V logic only
  • IA2 - The accelerometer's second interrupt pin. 3V logic only

LSM303AGR Only

  • INTM - The interrupt pin for the magnetometer. 3V logic only
  • CSA - The accelerometer's CS pin. 3V logic only
  • CSM - The magnetometer's CS pin. 3V logic only
Please note that while the LSM303AGR breakout has CS pins, it only supports 3-wire SPI which we were not able to get working. The adventurous of spirit may consult the datasheet and give it a try! PRs are welcome ;)

LSM303DLH Only

  • DRDY - This is the data ready pin. 3V logic only
This guide was first published on Mar 10, 2013. It was last updated on Mar 10, 2013. This page (Pinouts) was last updated on Mar 28, 2020.