LIS3MDL 3-axis digital magnetometer I2C/SPI - Pololu 2737

Description

Sensor, compass for measuring a magnetic field in three axes. It is characterized by small size, low energy consumption and usage simplicity. It communicates via the I2C or SPI bus. Thanks to the integrated converters, the sensor operates with a voltage of 3.3 V and 5 V.

 

For communication with the central unit, the popular I2C bus (TWI) or SPI bus is used. The module has necessary for the correct operation of the system, passive elements. Pins are the solder fields for self-assembly of goldpin connectors (included) for connecting the sensor viawiresor to directly attach to thebreadboard.

    

 

The module has a built-in step-down converter, whereby it is possible to work with voltages from 2.5 V to 5.5 V. The regulator's output is available on the pin VDD and can power external systems with the current of up to 150 mA

 

The product is compatible with Arduino

The manufacturer has prepareda libraryfor users ofArduino on the GitHub.

 

Pins

The sensor has 9 pins for mounting the connectors ofgoldpintype - pitch of 2.54 mm (included). SCL and SDA pins tolerate voltage higher than 3.3 V, as they are attached to the voltage converter. The remaining pins are not connected and do not tolerate 5 V voltages, therefore they must be connected through an external logic level converter.

 

 

Name

Description

VDD Regulated output of 3.3 V, max. 150 mA. VIN

The power supply of the system is from 2.5 V to 5.5 V. The converter aligns the SCL and SDA pins for the I2C and SPI bus to that level.

GND The ground of the system. SDA / SDI / SDO Data line for I2C and input line for SPI. High status is equal to VIN, low status is 0 V. SCL / SPC Clock line for I2C and SPI. High status is equal to VIN, low status is 0 V. SDO / SA1 Data output line for SPI. High status is equal to VDD, low status is 0 V. It's working with the voltage of 3.3 V. CS The choice of the data bus. High status (VDD) turns on the I2C communication (set by default). Low status turns on the SPI bus. DRDY Ready data indicator. High status informs that the data is ready for reading. It works with a voltage of 3.3 V. INT Programmable interrupts. It works with a voltage of 3.3 V. The details inthe documentation.

 

Specification

• Supply voltage: 2.5 V to 5.5 V
• Current consumption: 3 mA
• Three axes: X, Y, Z
• Communication interface:
  • I2C - addressing: 0011110b or 0011100b
  • SPI
• Resolution: 16 bits for each axis
• Measurement range (customizable): ±4, ±8, ±12, ±16 gauss
• Board dimensions: 23 x 10 mm

 

Useful links

• The website of the manufacturer: Pololu #2737
• Documentation of LIS3MDL
• Diagram of the module
• User manual
• Library for Arduino