Absolute angle encoder reference design with Hall-effect sensors for precise motor position control


Design files


The TIDA-060040 reference design demonstrates a method for absolute angle encoding typical in precision motor-control applications, such as robotic arm control. Angle encoding can be achieved using various magnetic sensing technologies. This is done by detecting two magnetic flux density, B-field, vector components that are naturally 90° out of phase. As the magnet spins, the sensor inputs are sinusoidal, which allows for calculations using trigonometric properties.

However, due to electrical and mechanical characteristics of the system, it is often necessary to correct the final result to achieve the greatest accuracy. Typically, in most precision motor-control applications, the final target error is less than 0.1°. This design explores the process for selecting a magnet, determining placement and correcting for system-level imperfections to achieve a highly-accurate angle measurement.

  • Measure angle in on-axis, in-plane and off-axis alignments for flexible alignment and sensor placement
  • Calibration process for accuracy of 0.1°
  • Selectable digital SPI communication or analog output
  • Design files with sensor-placement guidance
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUC07.PDF (1494 K)

Reference design overview and verified performance test data

TIDMA58.PDF (241 K)

Detailed schematic diagram for design layout and components

TIDMA59.PDF (134 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDMA60.PDF (192 K)

Detailed overview of design layout for component placement

TIDMA62.ZIP (2571 K)

Files used for 3D models or 2D drawings of IC components

TIDCG50.ZIP (878 K)

Design file that contains information on physical board layer of design PCB

TIDMA61.PDF (560 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Multi-axis linear & angle position sensors

TMAG5170High-precision, linear 3D Hall-effect sensor with SPI bus interface

Data sheet: PDF | HTML
Linear Hall-effect sensors

DRV5055Ratiometric linear hall effect sensor with analog output

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Abs. Angle Encoder Ref. Des. W/ Hall-Effect Sensors for Precise Motor Pos. Cont. PDF | HTML Mar. 16, 2022

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