Evaluation Boards Different evaluation boards for AMR, GMR and TMR sensor technology

Different evaluation boards are available for angle and length measurement to help test a possible solutions for your application. AMR, GMR and TMR sensor boards with secondary electronic components for further signal processing:

  • Easy assembly
  • Access to all necessary signal
  • Easy access to xMR technology 
  • Powerful signal processing on some boards

Three evaluation board types are available for evaluating the angle and length measurement

  • EBK7000 Powerful kit with various sensors and measurement scales for angle and length measurement - further including processing
  • GLAM700 evaluation boards for tooth structures
  • TL900 evaluation boards featuring the latest sensor generation  

EBK7000

  • Different AMR FixPitch sensors and GMR reference sensor
  • Adjustable amplifier and powerful interpolator
  • Can be used with an Arduino UNO (Arduino shield) 

GLM700

  • Simple analog signal amplification

TL900

  • Including ESD protection

General information

We offer different evaluation boards for a simple introduction to MR technology for angle and length measurement. The boards are simple to assemble and enable easy access to the sensor signals in order to connect them to your measurement equipment and use them for your application.

The EBK7000 evaluation kit contains various sensors and features extended signal processing. This evaluation board can be used for wide range of applications.

EBK7000

The evaluation kit allows to learn how different factors impact on the resolution of the measurement signal (length of magnetic pole pitch, interpolation factor, etc.)

As a rule of a thumb the distance between the sensor chip and the surface of the pole wheel must not exceed 50% of the magnetic pole length.

The EBK7000 was developed as an extension board for an Arduino microcontroller system. This provides an opportunity for software adjustment of gain and interpolation factor. Analog and digital sensor signals can be received and processed by the microcontroller.

 Signal processing of MR sensor signals is realized by an interpolation ASIC. Basis of the signal conditioning are amplifiers, A/D converters and logic functions. The output signals of the MR sensor are amplified in order to operate the A/D converter in an optimal range. The change of the sensor signal is converted to a square wave with 90 degrees phase shift between sine and cosine channel and the set resolution. Interpolation is a multiplication of the basic period of the System.

Content of the EBK7000

QuantityNameDescription
1EBK7000Evaluation board
1AL796AMR FixPitch sensor with 2 mm polar adjustment
1AL780AMR FixPitch sensor with 5 mm polar adjustment
1GF708GMR field sensor for a reference or index signal
1AA745AMR FreePitch sensor
1MagnetMagnet with diametric magnetization
1MWI0046KACPole ring with 2 mm pole pitch
1MWI0018KAEPole ring with 5 mm pole pitch
1MLI0050UACLinear scale with 2 mm pole pitch
1MLI0020UAELinear scale with 5 mm pole pitch

GLAM700

The amplifier boards of the GLAM700 family are designed for the evaluation of the GLM700ASB tooth sensor modules, making them an excellent and simple product development tool. The amplifier board features the GLM module and an amplifier for a more easily usable signal. There are two through holes for easy assembly of the module. The electrical connection is via a pin strip.

When a ferromagnetic tooth structure with a suitable pitch is used, the module supplies two analog signals (sine and cosine) phase-shifted by 90°. These signals can be interpolated or further processed by analog-to-digital conversion.

Variant of GLAM700

NameDescription
GLAM711Evaluation board for 1 mm tooth pitch
GLAM712Evaluation board for 2 mm tooth pitch
GLAM713Evaluation board for 3 mm tooth pitch
GLAM714Evaluation board for 0.94 mm (module 0.3) tooth pitch
GLAM715Evaluation board for 1.57 mm (module 0.5) tooth pitch

TL900 Evalboard Family

The TL900 Evalboards are very simple sensor chip carriers without special signal conditioning.

These evaluation boards supply only the raw signals of the TMR FixPitch sensors. Use the excellent signal quality of the raw signals to find out how easily TMR technology can take your application to the new level.

Variants of  TL900 Evalboards

NameDescription
TL912 EvalEvaluation board for 1 mm pitch (0.5 mm pole pitch)
TL913 EvalEvaluation board for 2 mm pitch (1 mm pole pitch)
TL915 EvalEvaluation board for 5 mm pitch (2.5 mm pole pitch)

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Design features

Sensitec is increasing the sensor efficiency by means of various design modifications to the chip layout. The patented solutions, described more closely below, also contribute to better signal quality, reduced sensitivity to stray fields and increased control accuracy. 

FreePitch

FreePitch sensors have been optimized to the extent that they can be used independent of the pole length of the measurement scale. This has the benefit of them being particularly compact and coming very close to a point sensor. They are the ideal choice if a particularly cost-effective solution is needed for the measurement task. In order to keep the dimensions as small as possible, the Wheatstone bridges are nested within each other. In order to generate the sine/cosine signals, both bridges are positioned at an angle of 45° to each other.
FreePitch sensors can be used with pole rings or linear scales with almost any pole length, as well as with dipole magnets.

PerfectWave

The PerfectWave design is applied in order to optimize the signal quality of the FreePitch sensors. The MR strips that serve as resistors have a curved form which is used to filter the harmonics when mapping the magnetic field direction in an electric signal. This filtering is implemented using the special geometry and arrangement of the MR strips and does not cause any additional signal propagation delay. The PerfectWave design is particularly effective for small magnetic fields and results in improved linearity, higher accuracy and better signal quality.