MT6835 21-Bit Magnetic Rotary Angle Encoder IC – High-Speed Position Sensor

Overview 

The MT6835 is a fourth-generation magnetic angle encoder IC from MagnTek designed to replace traditional fragile optical encoders. By sensing the direction of a rotating magnetic field in the $x$–$y$ plane, it delivers absolute angular position tracking with up to 21-bit core resolution. Its robust contactless design makes it highly immune to stray magnetic fields, air-gap fluctuations, and mechanical wear.

Key Features 

• Ultra-High Resolution: Provides 21-bit absolute angle positioning via a 4-wire SPI interface alongside high-resolution incremental output.

• High-Speed Performance: Supports maximum rotation speeds of up to 120,000 RPM, making it ideal for high-performance motor commutations.

• Flexible Output Interfaces: Features independent output options including ABZ quadrature (up to 16,384 pulses per revolution), UVW commutation signals, PWM, and SPI.

• Auto-Calibration & Low Nonlinearity: Built-in self-calibration routines compensate for mechanical misalignment to minimize INL errors.

• Stray Field Immunity: AMR sensing technology ensures accuracy is independent of magnetic field strength variations.

Technical Specifications 

Ideal Applications 

• Robotic Actuators & Joints: Precise joint angle feedback for advanced multi-axis robotic arms.

• BLDC & Servo Motor Control: High-speed closed-loop commutation replacing optical encoder setups.

• Industrial Automation: Precision CNC machinery and rotary position tracking systems.