Broadcom AS20-M42M

Magnetic energy harvesting multi-turn absolute kit encoder

Miniature 20mm diameter full magnetic energy harvesting multi-turn absolute kit encoder.

 

Key features

• High position accuracy magnetic single-turn
• Patented Energy Harvesting technology multi-turn counter
• Typical 42-bit resolution with 18-bit single-turn and 24-bit multi-turn
• Overall encoder outer diameter Ø20 mm and maximum height of 22.5 mm

 

Additional features

• 5V +/- 10 % voltage supply
• Built-in differential communication protocol (option)
  • Standard SSI (10MHz), BiSS-C (10MHz) & RS-485 half-duplex (2.5Mbps/5Mbps/10Mbps)
     
• Single-ended communication protocol: SPI 4-wire (10MHz)
   

The AS20-M42M series encoder is an absolute magnetic encoder comprising a default 18-bit single-turn (ST) and 24-bit multi-turn (MT) counts by Broadcom. In order to improve system integrity and simplicity, a single magnetic solution is responsible for both ST and MT positions generation.

The AS20 encoder is only 20mm in outer diameter, including the external housing, which acts also as the magnetic shield for the overall magnetic encoding system.

The design of this encoder features state-of-the-art Energy Harvesting Multi-turn technology. This technology converts rotating magnetic field into electrical energy, which powers the revolution tracking circuit regardless of the encoder rotation speed and direction. Therefore, there is no loss of revolution count even in the absence of external power supply. Energy Harvesting Multi-Turn does not require periodic maintenance of the battery backup components and the downtime associated with it.

The AS20-M42M series encoder has a selection of built-in communication protocols, which are supported by a full-duplex or half-duplex differential line transmissions drive, offering good noise immunity for more robust transmission of data in SSI/BiSS-C/RS485 protocol up to 10Mbps in harsh industrial applications. SPI 4-wire serial protocol is also available in single-ended output. Being a magnetic technology-based encoder, it is a robust solution against contamination such as dust and fingerprints on the sensing element. As a result, it requires less stringent controls in production handling and harsh environments.

 

Applications

• Stepper, BLDC, AC Servo motor control
• Linear actuator
• Robotic engineering and automation
• Factory and automotive automation
• Automated guided vehicles (AGV)
• Specialized medical and scientific laboratory equipment

 

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