CUI Inc. — Compact, Low Power Absolute Encoders Offer 12-bit or 14-bit Resolutions

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The AMT21 series, featuring high speed RS-485 communication, and the AMT23 series, designed with a Synchronous Serial Interface (SSI), are based on CUI’s proprietary capacitive sensing technology.

The capacitive platform offers a highly durable and accurate position feedback solution that is resilient to the dirt, dust, and oil typically encountered in motion applications. Housed in compact packages measuring as small as 1.53 x 1.12 x 0.40 inches (39 x 28 x 10mm) with a locking hub for easy installation, the two series boast a low current draw of 8mA at 5V and accuracy of ±0.2 mechanical degrees, making them ideally suited for battery-powered industrial, robotics, and automation applications.

Both models come in either radial or axial orientations and carry an operating temperature range from -40°C to +105°C. Thanks to the digital nature of these absolute encoders, the AMT21 and AMT23 are highly customizable and configurable with the ability to program the direction of rotation and zero position via CUI’s AMT Viewpoint™ software. The AMT’s simple design further reduces the time-consuming tasks of mounting and alignment to mere seconds with the One Touch Zero™ feature.

Designed to mate with a broad range of motors, the AMT21 and AMT23 are also featured as a kit that contains 9 sleeve bore options ranging from 2mm to 8mm, two simple mounting tools, and one standard and one wide base plate with multiple pre-drilled mounting hole patterns, offering users the ultimate flexibility in their design.


  • Industrial
  • Robotics
  • Battery-powered equipment
  • Automation applications

  • 12-bit absolute (4096) position or 14-bit absolute (16384) position
  • Resilient to dust, dirt and oil
  • Low current draw
  • Modular locking hub design for simple assembly
  • One Touch Zero set
  • -40°C to +105°C temperature range
  • SSI or RS-485 communication
  • High accuracy
  • Compact design
  • Compatible with AMT Viewpoint GUI