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AksIM™ rotary absolute encoder module


AksIM™ rotary absolute encoder module

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Not recommended for new design. Please go to AksIM-2™ off-axis rotary absolute encoder.


AksIMTM is a non-contact high performance off-axis absolute rotary encoder designed for integration into space-constrained applications. A hollow ring, true absolute functionality and high speed operation make this encoder suitable for many applications.


The AksIMTM board level encoder is specifically designed for integration into applications where there is no space for the classic AksIMTM readhead with T-shaped housing. An external case (provided by the customer) must serve as environmental protection of the encoder.


The board level encoder system consists of an axially magnetised ring and a readhead board.
The encoder has a built-in advanced self-monitoring function, continually checking several internal parameters. Error reporting, warnings and other status signals are available on all digital interfaces and are visualised with the on-board LED.


The encoder system is suitable for use in industrial and medical applications. A typical application is a robotic arm joint with a cable feed running through the ring or a precision gearbox where the ring is attached onto the main transmission shaft. Custom readhead board design service for OEM integration is also available.

All output types (SG, PW, SD, DD, SP and FC)
Reading type Axial reading
Resolution From 15 to 20 bit
Maximum speed > 10,000 rpm
Encoder accuracy ±0.05° (before installation - errors caused by mounting inaccuracy of the readhead, ring and drive shaft are not included)
Final system accuracy Typ. ±0.1°
Hysteresis Less than unit of resolution
Repeatability Better than unit of resolution
All output types (SG, PW, SD, DD, SP and FC)
Supply voltage 4 V to 6 V (3.3 V option available upon request)
Set-up time 10 ms (first data ready after switch-on)
Current consumption Typ. 115 mA, max. 150 mA
Connection FPC/FFC connector, 6 pins, 1 mm pitch
Output load Max. ±20 mA
ESD protection HBM, Class 2, max. 2 kV
Electrical connections Asynchronous serial, SPI slave simple, SPI slave advanced, I2C slave, SSI, BiSS, PWM
All output types (SG, PW, SD, DD, SP and FC)

Available ring sizes
(outer diameter)

49 mm (ring MRA7)
80 mm (ring MRA8)
Ring material type EN 1.4005 / AISI416 or EN 1.4104 / AISI430F
with glued NBR rubber filled with ferrite particles
Readhead thickness 4.3 mm
System thickness
With MRA7D049AA025B00 or MRA8D080AA055B00 8.4 ± 0.3 mm
With MRA7D049AB025E00 or MRA8D080AB055E00 6.5 ± 0.3 mm
Readheads: MBA7 2.6 g, MBA8 2.9 g

MRA7D049AA025B00 32 g, MRA7D049AB025E00 15 g, MRA7D049AB034A00 11g,
MRA8D080AA055B00 64 g, MRA8D080AB055E00 26 g, MRA8D095AD068B00 72 g


MRA7D049AA025B00 13.1 kg×mm2, MRA7D049AB025E00 5.5 kg×mm2,
MRA7D049AB034A00 4.8 kg×mm2, MRA8D080AA055B00 79.1 kg×mm2,
MRA8D080AB055E00 31.2 kg×mm2, MRA8D095AD068B00 114 kg×mm2

All output types (SG, PW, SD, DD, SP and FC)
Operating -30 °C to +70 °C
Storage -40 °C to +85 °C
Humidity 0 % to 70 % non-condensing
Environmental protection None (conformal coating available upon request)
External magnetic field Max. ±3 mT (DC or AC) on top side of readhead


Not recommended for new design.
Please go to AksIM-2™ off-axis rotary absolute encoder.

  • True absolute system
  • Custom magnetic sensor ASIC
  • No hysteresis
  • Resolution to 20 bits
  • High speed operation
  • Low profile, non-contact
  • Built-in self-monitoring
  • Integrated status LED
  • SSI, SPI, PWM, BiSS, asynchronous serial communication interfaces
  • I2C available upon request
  • Corrosion resistant magnetic ring