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 make I2C connections to dev boards with STEMMA QT connectors or to other things with various associated accessories
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DO/AD1 Jumper - I2C Address pin. Pulling this pin high or bridging the solder jumper on the back will change the I2C address from 0x1C to 0x1E. See this guide for how to check and verify the set address.
The D0/AD1 pin is pulled to ground with a 10k resistor. For a few samples of the LIS3MDL, this may cause erratic setting of the I2C address. If you encounter the problem, tie the pin directly to ground or to 3.3V at the jumper on the back.
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 - This is also the SPI Clock pin, it's an input to the chip
- SDA - this is also the Serial Data In / Microcontroller Out Sensor In pin, for data sent from your processor to the LIS3MDL
- DO - this is the Serial Data Out / Microcontroller In Sensor Out pin, for data sent from the LIS3MDL 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 LIS3MDL's to one microcontroller, have them share the SDA, SDO and SCL pins. Then assign each one a unique CS pin.
Other Pins
- INT -This is the interrupt pin. You can setup the LIS3MDL to pull this low when certain conditions are met such as a value exceeding a threshold. Consult the datasheet for usage
- DRDY - The data ready pin. When measurement data is available the sensor will pull this pin low
Page last edited March 08, 2024
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