SmartElex MLX90393 Triple Axis Magnetometer High-Precision Magnetic Field Sensor
🔍 Overview
The module is based on the MLX90393 3-axis magnetometer IC, a high-resolution digital magnetic field sensor.
Measures magnetic field along:
X-axis
Y-axis
Z-axis
Provides precise vector magnetic field data
Suitable for:
Compass applications
Position sensing
Magnetic field analysis
👉 It is a 3D magnetic sensing solution with high sensitivity and flexibility.
⚙️ Working Principle
🧠 Hall / Magneto-Resistive Sensing
Uses Triaxis® Hall-based sensing technology
Detects magnetic field by measuring changes in internal sensor properties due to magnetic flux
🔄 Signal Processing
Magnetic field interacts with sensing elements
Generates small electrical signal
Internal amplifier boosts signal
ADC converts it into digital output
👉 Outputs represent magnetic field strength in each axis.
📊 Measurement Characteristics
Magnetic Field Range (Selectable)
±5 mT
±16 mT
±50 mT
👉 Wide range allows detection of:
Weak Earth’s magnetic field
Strong nearby magnets
Resolution
Up to 16-bit digital resolution
High sensitivity:
Detects very small field changes
Output Data
3-axis magnetic field values:
X, Y, Z components
⚡ Electrical Characteristics
Supply voltage: 2.2V to 3.6V
Low power consumption
Designed for embedded systems
🔗 Communication Interface
I²C interface
SPI interface
👉 Flexible digital communication with microcontrollers.
🧠 Internal Features
✔ Programmable Gain
Adjust sensitivity based on application
✔ Adjustable Resolution
Trade-off between:
Speed
Precision
✔ Temperature Compensation
Reduces drift due to temperature changes
✔ Multi-Axis Measurement
Simultaneous measurement of X, Y, Z fields
✔ Low Noise Design
Ensures stable and accurate readings
🔄 Operating Behavior
✔ Magnetic Field Detection
Measures both:
Static magnetic fields
Dynamic changes
✔ Vector Measurement
Provides direction + magnitude of magnetic field
✔ Orientation Detection
Can be used to determine:
Heading (compass direction)
Rotation relative to Earth
🌡️ Environmental Characteristics
Stable across wide temperature ranges
Maintains accuracy with internal compensation
⚠️ Limitations
Sensitive to:
External magnetic interference
Nearby electronics
Requires calibration for:
Accurate compass readings
Cannot measure:
Distance directly (only field strength)
🔌 Typical Pin Configuration
VCC → Power supply
GND → Ground
SDA / MOSI → Data
SCL / SCK → Clock
CS → Chip select (SPI mode)
🧩 Functional Role
The module acts as a:
Magnetic field sensor
Digital compass sensor
Position/orientation detector
Magnetic interaction measurement device
🏁 Summary
The SmartElex MLX90393 Magnetometer Breakout is a high-precision 3-axis magnetic sensing module that:
Measures magnetic field in X, Y, Z axes
Uses Hall-based sensing technology
Provides high-resolution digital output
Supports I²C and SPI communication
Offers programmable range and sensitivity
Is optimized for precision magnetic field and orientation sensing
