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FAMAS- Magnetic Angle Sensor

SENIS AG

SENA2Dx-Evaluation Kit

SENIS AG

SENA2Dx-Evaluation Kit

Features

  • Angle and speed measurements at up to 400,000 rpm
  • Direct angle information (no need for external ADC)
  • High resolution: better than 0.08°
  • Fast response: typically 0.6us
  • Magnetic field range: 20mT – 400mT

The SENIS® Fast Magnetic Angle Sensor (FAMAS) SENA2Dx is an integrated magnetic field sensor that allows the measurement of the rotation angle of the in-plane components of a magnetic field, such as that of a permanent magnet attached on-axis to a rotating shaft1. The co-integrated signal processing circuit represents a servo loop to track the external field which directly converts the angular position of the magnetic field to digital information. Thus, the angular position of the magnetic field, rotation direction, and angular velocity are available after less than 1 µs delay time. There are three modes of operation available - fast, balanced and high resolution – to offer optimal performance for the required application.

The SENA2Dx Eval Kit is designed for evaluation of the fast magnetic angle sensor (FAMAS) sensor to measure the rotation angle of the in-plane components of a magnetic field. Figure 2 shows the location of the field sensitive volume (FSV) which dimensions are about 100 x 100 x 10 µm3. The kit allows users to run and test the SENA2Dx sensor quickly and it includes the mounted sensor on a printed circuit board (PCB), a control box with a RaspberryPi (RasPI) to communicate and configure the sensor as well as cable and power supply (Table 1). There is green LED on the PCB to indicate if the sensor is powered. For details, please consult the data sheet of the SENA2Dx sensor chip https://www.senis.ch/sensors.

 

Features Typical Application
  • Contactless angle sensor 0–360°
  • Hall-based principle with patented direct angle-to-digital conversion (no angle calculation necessary)
  • Three selectable magnetic field strengths: low (20 mT), medium (100 mT) and high (400 mT)
  • High magnetic fields of more than 500 mT do not cause damage to the sensor
  • Small angle sensing volume of 100 x 100 x 10 µm3 12-bit representation of angle value, i.e., resolution 0.088°
  • Fast response time, signal propagation delay < 1 µs Measures the direction, angle and rotation speed of the magnetic field, from DC up to 400 krpm
  • On-chip offset, sensitivity and angle error correction
  • On-chip temperature compensation of offset and sensitivity
  • Non-volatile memory for permanent configuration and correction programming
  • Interfaces: 4-wire SPI (5V), Quadrature interface with Index (ABZ), Commutation signals (UVW)
  • Customer programming functions (SPI) Set zero rot. position • Digital output format selection: ABZ or UVW • Selectable resolution from 8 to 12 bit • Angle error correction • UVW configurable for 2, 4, 6 and 8 pole magnets
  • Low magnetic field threshold detection
  • Absolute rotary position sensor
  • Motor controlled applications • Robotic systems • DC brushless motors • Motor feedback/motion control • Rotational speed control
  • Optical encoder replacement
  • Potentiometer replacement
  • High speed machining tools

Application Note

FAMAS Presentation