In the field of magnetic sensing technology, three-axis Hall sensors are sparking a precision revolution. This type of sensor achieves true three-dimensional spatial magnetic vector measurement by simultaneously detecting the magnetic field strength in the X, Y, and Z axes, completely breaking through the limitation of traditional single axis Hall sensors that can only detect vertical magnetic fields. The core technology lies in depositing special magnetic flux concentration materials (IMC®) onto the surface of CMOS chips. Enable sensors to capture magnetic field components parallel to the chip surface, combined with high-precision signal chain processing, to achieve 360° full angle position detection. This non-contact measurement method avoids mechanical wear and significantly improves long-term stability and reliability in harsh environments, bringing unprecedented precision control capabilities to modern industry and consumer electronics.

 Core Technological Advantages: High Precision, Strong Robustness, and Flexibility

■  High Precision and Resolution: The resolution reaches 14 bits (digital signal), equivalent to a resolution of 0.022 °, which is much higher than traditional optical encoders. The typical linearity error is ±1°, and the accuracy is maintained at 10 bits (0.35 °) after temperature drift compensation.  The G830 angle sensor even achieves 16 bit ADC accuracy, with an angle error of only 0.02 ° and a temperature drift of 0.002 °/C, reaching the international leading level.

■  Exceptional Environmental Robustness: With strong temperature adaptability, resistance to mechanical tolerances and stray magnetic fields, the working temperature range can reach -40 ° C to+160 ° C, and is insensitive to magnet eccentricity and air gap changes (± 50% tolerance). The third-generation technology can resist stray field interference of 4 kA/m (such as electric vehicle motor magnetic field) and eliminate external interference through differential algorithms.

■  System Integration and Cost Optimization: No PCB packaging, supports direct soldering solutions such as DMP-4 (dual-mode packaging) and SMP-3 (single-mode packaging), eliminates the need for PCB boards, improves EMC/ESD reliability, and reduces system costs. Flexible magnetic circuit design, compatible with various types of magnets with radial/axial magnetization (ferrite, neodymium iron boron, etc.), smaller size and no need for complex calibration.

Application Reach: From Automotive Core to Industrial Frontiers

In the field of automotive electronics, three-axis Hall sensors have penetrated into key nodes of power transmission:

■   Chassis and safety system: steering wheel torque/steering angle detection (EPS), electronic brake pedal position sensing, accuracy directly affects the stability control efficiency of the vehicle body.  

■   Powertrain control: Electronic throttle body, EGR valve angle feedback, with an error of ± 1° to ensure precise emission control.  

■   New electric architecture: motor rotor position detection (replacing photoelectric encoders), gearbox gear position sensor.

The industrial sector is also experiencing a wave of innovation:

■   Robot joint coding: realizes the detection of robotic arm posture, real-time monitoring of collaborative robot joint angles (0.1° repeatability accuracy), and adapts to industrial environments with anti oil pollution characteristics.  

■   Motor control: BLDC motor commutation angle detection, replacing optical encoders. 

■   Heavy machinery equipment positioning: Crane arm angle sensing, forklift lifting height detection, agricultural machinery steering angle feedback, IP equivalent protection against dust and water vapor erosion.

Three Axis Hall Angle Sensor Related Products

Micro-Magic Inc has produced a series of angle sensor products based on three-axis Hall technology, ranging from low to high precision, from low to high cost. Each product undergoes calibration, reverse and anti pulse peak voltage protection, and long-term aging stability testing before leaving the factory. Each process is precise and rigorous, ensuring reliability under different working conditions and long-term use cycles.

Angle Sensor Performance Indicators

Conclusion

The three-axis Hall angle sensor, with its non-contact, high-precision, and multi-dimensional technological advantages, is quietly reshaping the underlying architecture of multiple industries. With the breakthrough of technological bottlenecks, especially the improvement of anti-interference ability and the integration of edge intelligence, this technology will develop towards miniaturization and intelligence, providing a more reliable "spatial perception eye" for the era of Internet of Things.

• Предыдущий пост

  Why is the IIC interface open-drain output?

• Следующий пост

  LDO overcurrent protection mechanism