STEMMA QT TMAG5273 (A1) 3D Hall Effect Magnetometer - Adafruit 6489

Description

TMAG5273 (A1) 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 magnetometers for the X, Y, and Z axes. This allows accurate determination of spatial magnetic field orientation and detection of motion and rotation of magnet-equipped objects.

The A1 version provides a measurement range of ±40 mT or ±80 mT, making it especially useful for applications requiring high accuracy in smaller magnetic field ranges. Sensor data is processed using a built-in 12-bit analog-to-digital converter (ADC) and is accessible via the I2C interface, enabling easy integration with microcontrollers, single-board computers, and embedded systems.

The module includes a built-in CORDIC angle calculation engine, allowing determination of angular position across a full 360° range. Calculations can be performed for selected magnetic axes, supporting both on-axis and off-axis measurements. This makes the sensor ideal for magnetic rotary encoders, joysticks, motion control systems, and position sensors. Magnetic sensing provides advantages over mechanical switches, offering higher reliability and no wear.

The sensor also features a temperature sensor for basic temperature monitoring and compensation for temperature effects on magnetic measurements. Thresholds for magnetic field and temperature can be configured to generate interrupt signals.

The breakout board is compatible with 3.3 V and 5 V logic and includes STEMMA QT / Qwiic connectors for quick I2C connection without soldering. Libraries for Arduino, CircuitPython, and Python are available for fast integration. Its small size, low power consumption, and high sampling speed make it suitable for robotics, industrial automation, IoT devices, user interfaces, and educational projects. The sensor is optimized for systems using ferrite or neodymium magnets and is not intended for measuring the Earth's weak magnetic field.

Features

• Chip: Texas Instruments TMAG5273 (A1)
• Sensor type: 3-axis Hall-effect magnetometer (X, Y, Z)
• Magnetic field measurement range (A1): ±40 mT or ±80 mT
• Built-in ADC: 12-bit
• CORDIC engine for angular position detection 0–360°
• Supports on-axis and off-axis measurements
• Integrated temperature sensor
• 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 per axis
• Configurable measurement averaging up to 32× for noise reduction
• Measurement triggering via I2C or INT interrupt pin
• Interrupt support for magnetic 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
• Module dimensions: 25.3 × 17.7 × 4.6 mm
• Weight: 1.7 g

Kit contains

• Adafruit TMAG5273 (A1) 3D Hall Effect Magnetometer module
• 2.54 mm gold pin header