SparkFun TMAG5273 Arduino Library

This is the SparkFun Arduino library for the Texas Instruments TMAG5273 low-power linear 3D Hall-effect sensor with I²C interface.

This SparkFun Arduino Library for the Texas Instruments TMAG5273 linear 3D Hall-effect sensor provides access to the core functionality of the sensor. The sensor itself includes three Hall-effect sensors, providing readings around the X, Y and Z axes of the device.

The Texas Instruments TMAG5273 is available on the following SparkFun breakout development boards:

• SparkFun IoT Brushless Motor Driver (ESP32 WROOM, TMC6300)
• SparkFun Linear 3D Hall-Effect Sensor - TMAG5273 (Qwiic)
• SparkFun Mini Linear 3D Hall-Effect Sensor - TMAG5273 (Qwiic)

Functionality

SparkFun Arduino Library for the TMAG5273 provides access to the a majority of the functionality provided by the the TMAG5273 device. This includes:

• Access to X, Y and Z Hall-effect sensor readings
• Data digitized via an integrated 12-bit ADC
• Integrated temperature sensor
• Configurable to enable any combination of magnetic axes and temperature measurements
• Integrated angle calculation engine (CORDIC) provides full 360 degree position information
• Magnetic gain and offset correction settings
• Configurable I2C address, with a default value of 0x22

Implemented, but not supported functionality

The TMAG5273 supports several advance features that this library does not support. These are namely:

Feature	Notes
CRC Communication Checks	This library contains a method to enable and disable this feature on the device, but the I2C communication implemented by the library will not read or check any provided CRS values
I2C Read/Write Methods	The TMAG5273 supports different format options for I2C operations. While this library provides a method to change the I2C configuration on the device, this library only uses standard I2C operations

While the library include configuration methods for the above features, these features are not supported. The methods are maintained only to provide backward compatibility with earlier versions (< 2.0) of this library.

Notes on Library Versions 2.0 and Above

Version 2.0 of this library involved a large "refactor" of the library to address existing issues, improve the overall implementation and form a foundation for easier library maintenance in the future. As part of this effort, several existing library methods were modified such that they are not backward compatible with earlier (1.*) library versions. These changes include the following:

• The method readWakeUpAndSleepData() no longer takes pointers as parameters. References are used to simplify use.
• Various methods that used float type parameters and return values, now use int8_t types to reflect the actual sensor data.
• Equations for data values, sensor temperature and offsets were validated and updated based on the TMAG5273 datasheet. Key intermediate data typing was also validated as needed to provide correct results.

Using the Library

The first step is to add the class named TMAG5273 to the implementation. An example of how to declare the sensor object is as follows:

TMAG5273 sensor; // Declare the hall-effect sensor

In the startup section of the implementation, the sensor is initialized by calling the begin() method with the address of the sensor and the Arduino Wire port to use.

// If begin is successful (0), then start example
    if (sensor.begin(TMAG5273_I2C_ADDRESS_INITIAL, Wire) == 1)
    {
        Serial.println("Sensor Detected and Initialized");
    }
    else 
    {
        Serial.println("Sensor failed to start!");
    }

Note: If using the defaults, the begin method can be called with no parameters.

At this point the sensor can be configured for your specific use.

Values from the sensor are read as follows:

    // read data values
    float magX = sensor.getXData();
    float magY = sensor.getYData();
    float magZ = sensor.getZData();
    float temp = sensor.getTemp();

    // output the values to the serial console
    Serial.print("Data -  Magnetic: [ X: ");
    Serial.print(magX);
    Serial.print(", Y: ");
    Serial.print(magY);
    Serial.print(", Z: ");
    Serial.print(magZ);
    Serial.print(" ] mT,    Temp: ");
    Serial.print(temp);
    Serial.println(" C");

Documentation

Reference	Description
Quick Reference	A quick reference API for the the main library object
Full Documentation	The full documentation and API for this Arduino library
SparkFun Hall-Effect Sensor - TMAG5273	Hardware GitHub Repository
Hall-Effect Sensor Hook Up Guide	Hardware Overview and Quick Start for the SparkFun Hall-Effect Sensor - TMAG5273
SparkFun IoT Brushless Motor Driver (ESP32 WROOM, TMC6300)	Hardware GitHub Repository
SparkFun IoT Brushless Motor DriverHook Up Guide	Hardware Overview and Quick Start for the SparkFun IoT Brushless Motor Driver

Examples

The following examples are provided with the library

Example	Description
Basic Readings	Shows basic sensor setup and value reading
Interrupt Triggered Reading	Demostraights how to use a interrupt to trigger data reading
Angle Calculations	Setting up and reading Angle Calculations from the sensor
I2C Address Setting	How to change the I2C address of the sensor
IOT Motor Driver Readings	Using the TMAG5273 with the SparkFun IoT Brushless Motor development board

License Information

This product is open source!

This product is licensed using the MIT Open Source License.