STEMMA QT TMAG5273 (A2) 3D Hall Effect Magnetometer - Adafruit 6490

Description

TMAG5273 (A2) 3D Hall Effect Magnetometer is a compact magnetic sensor module designed for precise measurement of magnetic fields along three axes. The device is based on the Texas Instruments TMAG5273 sensor, which integrates three independent Hall-effect sensors for the X, Y, and Z axes, enabling full three-dimensional detection of magnetic field orientation. This allows the module to be used for motion, rotation, and position detection of objects equipped with permanent magnets.

The A2 version provides an extended measurement range of ±133 mT or ±266 mT, allowing operation with stronger ferrite or neodymium magnets. Sensor data is processed using an integrated 12-bit analog-to-digital converter (ADC) and transmitted via the I2C interface, enabling simple integration with microcontrollers and single-board computers.

The device also includes a built-in CORDIC angle calculation engine, allowing precise angular position detection within a full 360° range. This feature supports both on-axis and off-axis measurements, making the sensor suitable for applications such as magnetic rotary encoders, robotic manipulators, joysticks, and motion control systems. Magnetic sensing technology offers the advantage of having no mechanical components subject to wear.

The module additionally integrates a temperature sensor, enabling basic temperature measurement and compensation for temperature effects on magnetic field readings. The sensor also supports configurable magnetic and temperature thresholds that can generate interrupt signals when exceeded.

The board is designed as a convenient breakout module compatible with 3.3 V and 5 V logic levels. Thanks to the integrated STEMMA QT / Qwiic connectors, the sensor can be quickly connected to an I2C bus without soldering. The manufacturer provides libraries for Arduino, CircuitPython, and Python, allowing developers to quickly start working with the module. Due to its wide measurement range and high sampling speed, the sensor is particularly well suited for applications using permanent magnets, such as positioning systems, robotics, user interfaces, and industrial automation. Its small size and low power consumption also make it ideal for portable devices and IoT projects.

Features

• Chip: Texas Instruments TMAG5273 (A2)
• Sensor type: 3-axis Hall-effect magnetometer (X, Y, Z)
• Magnetic field measurement range (A2): ±133 mT or ±266 mT
• Integrated ADC: 12-bit
• Built-in CORDIC angle calculation engine for position detection from 0 to 360°
• Supports both on-axis and off-axis measurements
• Integrated temperature sensor
• Built-in temperature compensation for various magnet types
• Configurable power modes:
  • 2.3 mA – active mode
  • 1 µA – wake-up / sleep mode
  • 5 nA – deep sleep mode
• Maximum conversion rate: 20 kSPS for a single axis
• Configurable measurement averaging up to 32× for noise reduction
• Measurement triggering via I2C bus or INT interrupt pin
• Interrupt signal support for magnetic field or temperature threshold events
• Typical sensitivity drift: 5%
• Communication interface: I2C with CRC support
• Maximum I2C clock frequency: 1 MHz
• Special I2C read frames for increased throughput
• Factory-programmed and configurable I2C addresses (require reconfiguration after reset)
• Logic compatibility: 3.3 V and 5 V
• Connectors: STEMMA QT / Qwiic
• Dimensions: 25.5 × 17.7 × 4.6 mm
• Weight: 1.7 g

Kit contains

• Adafruit TMAG5273 (A2) 3D Hall Effect Magnetometer module
• 2.54 mm gold pin header