AS38-H39E Series

39-Bits Energy Harvesting Multi Turn Encoder

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The AS38-H39E is a multi-turn absolute encoder series available with a high-resolution option of 39 bits (23-bit single-turn and 16-bit multi-turn). The single-turn encoder contains a detector Opto-ASIC that is accompanied by a high-precision amplifier circuitry coupled with a special multi-track code disk that rotates between the emitter and the detector. The multi-turn encoder does not need a battery as its power is generated by the Wiegand-based energy harvesting technology. When the shaft rotates, the magnet mounted on the shaft moves in tandem. The energy harvesting coil module reacts with the moving magnet field, generating count pulses and energy as a result. The beauty is that the same amount of energy is generated independent of the speed of rotation. The generated energy is sufficient to power the revolution tracking circuitry. Therefore, no miss counts occur even in the absence of an external power supply.


  • 39-bits resolution: 16-bits energy harvesting multi-turn & 23-bits optical single-turn
  • Built-in communication protocol (option): BiSS C mode, SSI mode & RS-485 half-duplex
  • Overall encoder outer diameter Ø38 mm and maximum height of 40 mm
  • Supporting ¼ inch, 6mm and 8mm diameter of the blind hollow shaft


  • Robot and Robotic Engineering
  • Factory Automation
  • Angular and Linear Positioning Systems
  • CNC Machine Tools

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Line Driver N
Motion Type Rotary
Optical Method Transmissive
Output Code Binary
Output Type Digital
Shaft Diameter 8
Resolution 39 Bits
Application Note1 i
Data Sheet1 i
Reliability Data Sheet1 i