{"product_id":"2737-lis3mdl-3-axis-magnetometer-carrier-with-voltage-regulator","title":"LIS3MDL 3-Axis Magnetometer Carrier with Voltage Regulator","description":"\u003cp\u003eThis module is a carrier\/breakout board for the ST LIS3MDL three-axis magnetometer. The sensor provides magnetic field strength measurements with a configurable range of ±4 gauss to ±16 gauss that can be read through a digital I²C or SPI interface. The board includes a 3.3 V voltage regulator and integrated level shifters that allow operation from 2.5 to 5.5 V, and the 0.1″ pin spacing makes it easy to use with standard solderless breadboards and 0.1″ perfboards.\u003c\/p\u003e\n\u003cbr\u003e\u003ctable class=\"picture_with_caption right\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J7026.1200.jpg?b1f9257ad563d0db93facfbb273c312f\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id magnetometer carrier with voltage regulator bottom view dimensions. data-picture-id=\"0J7026\" data-picture-longest_side=\"864\" src=\"https:\/\/a.pololu-files.com\/picture\/0J7026.250.jpg?b1f9257ad563d0db93facfbb273c312f\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis board is a compact (0.4″ × 0.9″) breakout board for ST’s LIS3MDL three-axis digital magnetic sensor; we therefore recommend careful reading of the \u003ca href=\"\/file\/0J1089\/LIS3MDL.pdf\"\u003eLIS3MDL datasheet\u003c\/a\u003e (2MB pdf) before using this product.  The LIS3MDL is a great IC, but its small package makes it difficult for the typical student or hobbyist to use.  It also operates at voltages below 3.6 V, which can make interfacing difficult for microcontrollers operating at 5 V.  This carrier board addresses these issues by incorporating additional electronics, including a 3.3 V voltage regulator and level-shifting circuits, while keeping the overall size as compact as possible.  The board ships fully populated with its SMD components, including the LIS3MDL, as shown in the product picture.\u003c\/p\u003e\n\u003cp\u003eThe LIS3MDL has many configurable options, including four selectable sensitivity (gain) settings, a wide choice of output data rates, and a programmable external interrupt signal. The three magnetic field strength readings are available through a digital interface, which can be configured to operate in either I²C (TWI) or SPI mode.\u003c\/p\u003e\n\u003cp\u003eThe carrier board includes a low-dropout linear voltage regulator that provides the 3.3 V required by the LIS3MDL, which allows the sensor to be powered from a 2.5-5.5 V supply.  The regulator output is available on the VDD pin and can supply almost 150 mA to external devices. The breakout board also includes a circuit that shifts the I²C clock and data lines to the same logic voltage level as the supplied VIN, making it simple to interface the board with 5 V systems, and the board’s 0.1″ pin spacing makes it easy to use with standard \u003ca href=\"https:\/\/www.pololu.com\/category\/28\/solderless-breadboards\"\u003esolderless breadboards\u003c\/a\u003e and 0.1″ perfboards.\u003c\/p\u003e\n\u003cp\u003eThis LIS3MDL carrier is pin-compatible with many of our previous ST I²C\/SPI sensor carriers, including our \u003ca href=\"https:\/\/www.pololu.com\/product\/2127\"\u003eLSM303D compass and accelerometer carrier\u003c\/a\u003e, and the orientation of the sensor axes is the same. However, since the ICs contain different sensors with different I²C addresses and configuration registers, code written to interface with another chip will need to be modified to work with an LIS3MDL.\u003c\/p\u003e\n\u003cp\u003eFor sensor fusion applications, our \u003ca href=\"https:\/\/www.pololu.com\/product\/2738\"\u003eMinIMU-9 v5\u003c\/a\u003e and \u003ca href=\"https:\/\/www.pololu.com\/product\/2739\"\u003eAltIMU-10 v5\u003c\/a\u003e inertial measurement units combine this LIS3MDL with an \u003ca href=\"https:\/\/www.pololu.com\/product\/2736\"\u003eLSM6DS33\u003c\/a\u003e 3-axis accelerometer and 3-axis gyro on a single board, providing nine independent readings that can be used to calculate an absolute orientation.  The AltIMU-10 v5 also includes an \u003ca href=\"https:\/\/www.pololu.com\/product\/2867\"\u003eLPS25H\u003c\/a\u003e pressure sensor that can be used to calculate altitude.\u003c\/p\u003e\n\u003ch3 class=\"clear\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\t\u003cli\u003eDimensions: 0.4″ × 0.9″ × 0.1″ (10 × 23 × 3 mm)\u003c\/li\u003e\n\t\u003cli\u003eWeight without header pins: 0.6 g (0.02 oz)\u003c\/li\u003e\n\t\u003cli\u003eOperating voltage: 2.5 V to 5.5 V\u003c\/li\u003e\n\t\u003cli\u003eSupply current: 3 mA\u003c\/li\u003e\n\t\u003cli\u003eOutput format (I²C\/SPI): one 16-bit reading per axis\u003c\/li\u003e\n\t\u003cli\u003eSensitivity range (configurable): ±4, ±8, ±12, or ±16 gauss\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIncluded components\u003c\/h3\u003e\n\u003cp\u003eA 1×9 strip of \u003ca href=\"https:\/\/www.pololu.com\/product\/965\"\u003e0.1″ header pins\u003c\/a\u003e and a 1×9 strip of \u003ca href=\"https:\/\/www.pololu.com\/product\/967\"\u003e0.1″ right-angle header pins\u003c\/a\u003e are included, as shown in the picture below.  You can solder the header strip of your choice to the board for use with \u003ca href=\"https:\/\/www.pololu.com\/category\/70\/crimp-connector-housings\"\u003ecustom cables\u003c\/a\u003e or \u003ca href=\"https:\/\/www.pololu.com\/category\/28\/solderless-breadboards\"\u003esolderless breadboards\u003c\/a\u003e, or you can solder wires directly to the board itself for more compact installations.\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J7028.1200.jpg?15b28a0e021c906748efa26e3c77199d\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id magnetometer carrier with voltage regulator included optional headers. data-picture-id=\"0J7028\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J7028.300.jpg?15b28a0e021c906748efa26e3c77199d\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp\u003eThe board has one mounting hole that works with #2 and M2 \u003ca href=\"https:\/\/www.pololu.com\/category\/101\/nuts-and-screws\"\u003escrews\u003c\/a\u003e (not included).\u003c\/p\u003e\n\u003ch2 class=\"clear\"\u003eUsing the LIS3MDL\u003c\/h2\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cp\u003eRegardless of the interface being used to communicate with the LIS3MDL, its VIN pin should be connected to a 2.5 V to 5.5 V source, and GND should be connected to 0 volts. (Alternatively, if you are using the board with a 3.3 V system, you can leave VIN disconnected and bypass the built-in regulator by connecting 3.3 V directly to VDD.)\u003c\/p\u003e\n\u003cp\u003eA minimum of two logic connections are necessary to use the LIS3MDL in I²C mode (this is the default mode): SCL and SDA.  These pins are connected to built-in level-shifters that make them safe to use at voltages over 3.3 V; they should be connected to an I²C bus operating at the same logic level as VIN.  The remaining pins are \u003cins\u003enot\u003c\/ins\u003e connected to level-shifters on the board and are \u003cins\u003enot\u003c\/ins\u003e 5V-tolerant, but our \u003ca href=\"https:\/\/www.pololu.com\/product\/2595\"\u003e4-channel bidirectional logic level shifter\u003c\/a\u003e can be used externally with those pins to achieve the same effect.\u003c\/p\u003e\n\u003cp\u003eTo use the LIS3MDL in SPI mode, four logic connections are typically used: SPC, SDI, SDO, and CS. These should be connected to an SPI bus operating at the same logic level as VIN. The SPI interface operates in 4-wire mode by default, with SDI and SDO on separate pins, but it can be configured to use 3-wire mode so that SDO shares a pin with SDI.\u003c\/p\u003e\n\u003ctable class=\"side_by_side_pics\"\u003e\n\t\u003ctr\u003e\n\t\t\u003ctd\u003e\u003ctable class=\"picture_with_caption center\"\u003e\n\u003ctr\u003e\u003ctd style=\"max-width: 275px\"\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J7027.1200.jpg?6eed6ffeebe7ef8a9be702f80dbf49b5\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id magnetometer carrier with voltage regulator labeled top view. data-picture-id=\"0J7027\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J7027.275.jpg?6eed6ffeebe7ef8a9be702f80dbf49b5\"\u003e\u003c\/a\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth style=\"max-width: 275px\"\u003e\u003cp\u003eLIS3MDL 3-Axis Magnetometer Carrier with Voltage Regulator, labeled top view.\u003c\/p\u003e\u003c\/th\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/td\u003e\n\t\t\u003ctd\u003e\u003ctable class=\"picture_with_caption center\"\u003e\n\u003ctr\u003e\u003ctd style=\"max-width: 275px\"\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J7029.1200.jpg?a9844032eb83220d2d49ced558f52991\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id magnetometer carrier with voltage regulator in a breadboard. data-picture-id=\"0J7029\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J7029.275.jpg?a9844032eb83220d2d49ced558f52991\"\u003e\u003c\/a\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth style=\"max-width: 275px\"\u003e\u003cp\u003eLIS3MDL 3-Axis Magnetometer Carrier with Voltage Regulator in a breadboard.\u003c\/p\u003e\u003c\/th\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 class=\"clear\"\u003ePinout\u003c\/h3\u003e\n\u003ctable class=\"specifications center\"\u003e\n\t\u003ctr\u003e\n\t\t\u003cth\u003ePIN\u003c\/th\u003e\n\t\t\u003cth\u003eDescription\u003c\/th\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr class=\"odd\"\u003e\n\t\t\u003ctd\u003eVDD\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eRegulated 3.3 V \u003cstrong\u003eoutput\u003c\/strong\u003e. Almost 150 mA is available to power external components. (If you want to bypass the internal regulator, you can instead use this pin as a 3.3 V input with VIN disconnected.)\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr\u003e\n\t\t\u003ctd\u003eVIN\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eThis is the main 2.5 V to 5.5 V power supply connection. The SCL\/SPC and SDA\/SDI level shifters pull the I²C and SPI bus high bits up to this level.\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr class=\"odd\"\u003e\n\t\t\u003ctd\u003eGND\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eThe ground (0 V) connection for your power supply.  Your I²C or SPI control source must also share a common ground with this board.\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr\u003e\n\t\t\u003ctd\u003eSDA\/SDI\/SDO\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eLevel-shifted I²C data line and SPI data in line (also doubles as SDO in 3-wire mode): HIGH is VIN, LOW is 0 V\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr class=\"odd\"\u003e\n\t\t\u003ctd\u003eSCL\/SPC\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eLevel-shifted I²C\/SPI clock line: HIGH is VIN, LOW is 0 V\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr\u003e\n\t\t\u003ctd\u003eSDO\/SA1\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eSPI data out line in 4-wire mode: HIGH is VDD, LOW is 0 V.  \u003cem\u003eThis output is not level-shifted.\u003c\/em\u003e Also used as an input to determine I²C slave address (see below).\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr class=\"odd\"\u003e\n\t\t\u003ctd\u003eCS\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eSPI enable (chip select). Pulled up to VDD to enable I²C communication by default; drive low to begin SPI communication.\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr\u003e\n\t\t\u003ctd\u003eDRDY\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eData ready indicator, a 3.3-V-logic-level output. HIGH (3.3 V) indicates magnetic data can be read. \u003cem\u003eThis output is not level-shifted.\u003c\/em\u003e\n\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\t\u003ctr class=\"odd\"\u003e\n\t\t\u003ctd\u003eINT\u003c\/td\u003e\n\t\t\u003ctd style=\"text-align:left;\"\u003eProgrammable interrupt, a 3.3-V-logic-level output.  \u003cem\u003eThis output is not level-shifted.\u003c\/em\u003e\n\u003c\/td\u003e\n\t\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSchematic diagram\u003c\/h3\u003e\n\u003ctable class=\"picture_with_caption center wide\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J7018.1200.png?8756912958a6512540e6fb4760849251\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"wide zoomable\" data-gallery-pictures=\"[{\" id diagram of the lis3mdl magnetometer carrier with voltage regulator. data-picture-id=\"0J7018\" data-picture-longest_side=\"1050\" src=\"https:\/\/a.pololu-files.com\/picture\/0J7018.600.jpg?8756912958a6512540e6fb4760849251\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp\u003eThe above schematic shows the additional components the carrier board incorporates to make the LIS3MDL easier to use, including the voltage regulator that allows the board to be powered from a single 2.5-5.5 V supply and the level-shifter circuit that allows for I²C and SPI communication at the same logic voltage level as VIN. This schematic is also available as a \u003ca href=\"\/file\/0J1092\/lis3mdl-3-axis-magnetometer-carrier-with-voltage-regulator-schematic.pdf\"\u003edownloadable PDF\u003c\/a\u003e (90k pdf).\u003c\/p\u003e\n\u003ch3\u003eI²C communication\u003c\/h3\u003e\n\u003cp\u003eWith the CS pin in its default state (pulled up to VDD), the LIS3MDL can be configured and its readings can be queried through the I²C bus. Level shifters on the I²C clock (SCL) and data lines (SDA) enable I²C communication with microcontrollers operating at the same voltage as VIN (2.5-5.5V).  A detailed explanation of the protocol can be found in the \u003ca href=\"\/file\/0J1089\/LIS3MDL.pdf\"\u003eLIS3MDL datasheet\u003c\/a\u003e (2MB pdf), and more detailed information about I²C in general can be found in \u003ca href=\"\/file\/0J435\/UM10204.pdf\"\u003eNXP’s I²C-bus specification\u003c\/a\u003e (1MB pdf).\u003c\/p\u003e\n\u003cp\u003eIn I²C mode, the sensor’s 7-bit slave address has its \u003cem\u003esecond-least\u003c\/em\u003e significant bit determined by the voltage on the SA1 pin. The carrier board pulls SA1 to VDD through a 10 kΩ resistor, making the second-least significant bit 1 and setting the slave address to 0011110b by default. If the selected slave address happens to conflict with some other device on your I²C bus, or if you want to use two LIS3MDL sensors on the same bus, you can drive SA1 low to set the second-least significant bit to 0 (which sets the slave address to 0011100b).\u003c\/p\u003e\n\u003cp\u003eThe I²C interface on the LIS3MDL is compliant with the I²C fast mode (400 kHz) standard. In our tests of the board, we were able to communicate with the chip at clock frequencies up to 400 kHz; higher frequencies might work but were not tested.\u003c\/p\u003e\n\u003ch3\u003eSPI communication\u003c\/h3\u003e\n\u003cp\u003eTo communicate with the LIS3MDL in SPI mode, the CS pin (which the board pulls to VDD through a 10 kΩ resistor) must be driven low before the start of an SPI command and allowed to return high after the end of the command.  Level shifters on the SPI clock (SPC) and data in (SDI) lines enable SPI communication with microcontrollers operating at the same voltage as VIN (2.5 V to 5.5 V).\u003c\/p\u003e\n\u003cp\u003eIn the default 4-wire mode, the sensor transmits data to the SPI master on a dedicated data out (SDO) line that is \u003cins\u003enot\u003c\/ins\u003e level-shifted. If the SPI interface is configured to use 3-wire mode instead, the SDI line doubles as SDO and is driven by the LIS3MDL when it transmits data to the master. A detailed explanation of the SPI interface on the LIS3MDL can be found in its \u003ca href=\"\/file\/0J1089\/LIS3MDL.pdf\"\u003edatasheet\u003c\/a\u003e (2MB pdf).\u003c\/p\u003e\n\u003ch3\u003eSample Code\u003c\/h3\u003e\n\u003cp\u003eWe have written a basic \u003ca href=\"https:\/\/github.com\/pololu\/lis3mdl-arduino\"\u003eArduino library for the LIS3MDL\u003c\/a\u003e that makes it easy to interface this sensor with an \u003ca href=\"https:\/\/www.pololu.com\/product\/2191\"\u003eArduino\u003c\/a\u003e or Arduino-compatible board like an \u003ca href=\"https:\/\/www.pololu.com\/category\/149\/a-star-programmable-controllers\"\u003eA-Star\u003c\/a\u003e.  The library makes it simple to configure the LIS3MDL and read the raw magnetometer data through I²C.\u003c\/p\u003e\n\u003ch3\u003eProtocol hints\u003c\/h3\u003e\n\u003cp\u003eThe datasheet provides all the information you need to use this sensor, but picking out the important details can take some time.  Here are some pointers for communicating with and configuring the LIS3MDL that we hope will get you up and running a little bit faster:\u003c\/p\u003e\n\u003cul\u003e\n\t\u003cli\u003eThe magnetometer is in power-down mode by default. You have to turn it on by writing the appropriate value to the CTRL_REG3 register.\u003c\/li\u003e\n\t\u003cli\u003eYou can read or write multiple registers in a single I²C command by asserting the most significant bit of the register address to enable address auto-increment.\u003c\/li\u003e\n\t\u003cli\u003eYou can enable the same auto-increment feature in SPI mode by asserting the second bit (bit 1, called the M\u003cspan style=\"text-decoration:overline\"\u003eS\u003c\/span\u003e bit in the datasheet) of an SPI command.\u003c\/li\u003e\n\t\u003cli\u003eIn addition to the datasheet, ST provides an \u003ca href=\"\/file\/0J1090\/LIS3MDL-AN4602.pdf\"\u003eapplication note\u003c\/a\u003e (598k pdf) containing additional information and hints about using the LIS3MDL.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pololu","offers":[{"title":"2-4 Settimane","offer_id":47696596762969,"sku":"POL-2737","price":14.57,"currency_code":"EUR","in_stock":true},{"title":"1 Giorno","offer_id":47885965263193,"sku":"POL-2737\/A","price":14.57,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1009\/7753\/files\/0J7025.1200.jpg?v=1705454279","url":"https:\/\/robot-italy.com\/products\/2737-lis3mdl-3-axis-magnetometer-carrier-with-voltage-regulator","provider":"Robot Italy","version":"1.0","type":"link"}