EBx7900 family Sensor modules with an incremental output

The sensor modules of the EBx7900 family are sensor modules with digital incremental output signals. 

The sensor modules offer

  • Various versions for a large range of applications
  • Selectable and/or programmable interpolations
  • Compact design
  • Modules with and without reference signals

This product family has 5 different basic sensor modules for you to choose from:

  • EBI7901 with FreePitch or FixPitch (1 mm) sensor and selectable resolution up to 80 flanks/pitch.
  • EBI7903 with FixPitch (1 mm) sensor and programmable resolution up to 8192 flanks/pitch.
  • EBI7904 is almost identical in design to the EBI7903 but features additional protective diodes.
  • EBR7912 with FixPitch (2 mm) sensor and reference signal as well as programmable resolution.

The sensor modules use FixPitch sensors and are thereby adjusted to the pole pitch of the measurement scale. The EBR7911 sensor module features the SmartFit function and shows the user whether or not the sensor is properly adjusted.

The sensor design of the sensors used is based on PerfectWave technology, which improves the signal quality by suppressing the harmonics.

Suitable for absolute or incremental applications (linear or rotary motion) e.g.:

  • Motor commutation
  • Speed measurement
  • Linear measurement systems

General information

The sensor modules of the EBx7900 family are sensor modules based on the anisotropic MagnetoResistive (AMR) effect. Almost all modules are equipped with FixPitch sensors, which are adapted to a fixed pole pitch on the measurement scale. This ensures an excellent signal quality and high achievable levels of accuracy.

The sensor signals of the sensor modules are processed in an ASIC and can be issued as digital quadrature signals (A/B or A/B/Z). Some modules have differential output signals with line drivers.

The modules with a software-based calibration function are adjusted and optimally calibrated by us during production.

Product variants

NameSensorOutputResolution / pitchCalibrationComments
EBI7901ZAxFreePitch, >2 mmA/Bup to 80 flanksno-
EBI7901CAxFixPitch, 1 mmA/Bup to 80 flanksno-
EBI7903CAxFixPitch, 1 mmA/Bup to 8192 flanksyes-
EBI7904CAxFixPitch, 1 mmA/Bup to 8192 flanksyeswith protective diodes
EBR7912EBxFixPitch, 2 mmA/B/Z (diff.)up to 256 flanksyes-

EBI7901

The sensor modules of the EBI7901 product range consist of an AMR sensor and an ASIC with an interpolation function. When used with a magnetic measurement scale, the modules deliver two square wave signals A and B phase-shifted by 90°. The resolution can be selected between 4 and 80 measurement steps (initial selection on ordering).

The EBI7901ZAx module with an AMR FreePitch sensor can be operated on magnetic measurement scales starting at a pole length of 2 mm.

The EBI7901CAx module with an AMR FixPitch sensor is designed for magnetic measurement scales of a pole length of 1 mm.

EBI7903

The sensor modules of the EBI7903CAx product range consist of an AMR FixPitch sensor and a 13-bit interpolation ASIC. When used with a magnetic measurement scale with a pole length of 1 mm, the modules deliver two differential square wave signals A and B phase-shifted by 90°.

The resolution can be set to up to 8192 measurement steps per pole. The modules are calibrated during production and thus offer higher accuracy.

The sensor module can emit one additional reference pulse per pole pitch.

EBI7904

The sensor modules of the EBI7904CAx product range consist of an AMR FixPitch sensor and a 13-bit interpolation ASIC. When used with a magnetic measurement scale with a pole length of 1 mm, the modules deliver two differential square wave signals A and B phase-shifted by 90°. The modules have additional protective diodes at the outputs and the supply voltage.

The resolution can be set to up to 8192 measurement steps per pole. The modules are calibrated during production and thus offer higher accuracy.

EBR7912

The sensor modules of the EBR7912EBx product range consist of an AMR FixPitch sensor, a GMR reference sensor and an 8-bit interpolation ASIC. When used with a magnetic measurement scale with a pole length of 2 mm, the modules deliver two differential square wave signals A and B phase-shifted by 90°.

The resolution can be set to up to 256 measurement steps per pole. The sensor module is calibrated and offers increased accuracy and lower edge jitter.

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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. 

FixPitch

FixPitch sensors are adjusted to the pole lengths of the measurement scale, i.e. MR strips are geometrically coordinated to a specific pole length. The sine and cosine signals are generated by distributing the Wheatstone bridge resistances along the single pole. This geometric arrangement contributes to the suppression of the harmonics and a reduction in the sensitivity to stray fields. This optimizes the linearity of the sensor. 

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.