EBx7900 family Sensor modules with an incremental output
General information
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
- Absolute measurement solutions
Product variants
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.
- EBx7914 with different sensors, reference sensor and programmable resolution. Autocalibration.
- EMI7913 especially designed for linear motors. Sensormodule use the motor magnets as the scale.
- EBM7921 for an absolute measuring of 360 degree within off-axis applications.
Design features
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.
Application examples
Suitable for absolute or incremental applications (linear or rotary motion) e.g.:
- Motor commutation
- Speed measurement
- Linear measurement systems
- Linear motors
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
| Name | Sensor | Output | Resolution / pitch | Calibration | Comments |
|---|---|---|---|---|---|
| EBI7901ZAx | FreePitch, >2 mm | A/B | up to 80 flanks | no | - |
| EBI7901CAx | FixPitch, 1 mm | A/B | up to 80 flanks | no | - |
| EBI7903CAx | FixPitch, 1 mm | A/B | up to 8192 flanks | yes | - |
| EBI7904CAx | FixPitch, 1 mm | A/B | up to 8192 flanks | yes | with protective diodes |
| EBR7912EBx | FixPitch, 2 mm | A/B/Z (diff.) | up to 256 flanks | yes | - |
| EBx7914 | FixPitch, 0.5 to 5 mm | A/B/Z (diff.) or SPI | up to 16384 flanks | yes | autocalibration |
| EMI7913 | FixPitch, various | A/B or 1Vpp | up to 4000 flanks | yes | Pitch can adapted to motor magnets |
| EBM7921 | FixPitch 5 mm | SPI | yes | 360 degree absolute |
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.
EBI7914
The compact and high-resolution sensor modules of the Type EBI7914 are equipped with different AMR-FixPitch sensors and a 26-bit interpolation ASIC. Using magnetic scales with different pitches generate two differential signals with a 90-degree phase shift to each other (quadrature signal A/B). To receive high performance and resolution in field the module includes an automatic adjust.
With the exception of one variant to measure a 360-degree absolute angle measurement at the end of the shaft the sensor TA903 which is based on the TMR-effect is mounted on the bottom side.
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.
You can also order this product via RS Components.
EBR7914
In comparison to the EBI7914 sensor modules a TA903 sensor, based on the TMR-effect is mounted on an additional reference PCB. The ASIC generates according to the incremental input a 3 channel differential output signal (A/B/Z).
EMI7913
The EMI7913 is a sensormodule especially designed for linear motors. The module can be adapted to the magnetic pitch of the linear motor and the motor magnets are used as the measurment scale for the sensor module. The sensormodule is equiped with an additional signal conditioning with A/B quadrature output or a 1Vpp interface. To increase the accuracy of the module two different sizes of the module are available to realize the best adaption to the motor magnets.
EBM7921
The sensor module EBM7921 consists of two TMR FixPitch sensors in combination with a signal conditioning IC. Based on the vernier principle with the two TMR FixPitch sensors the module determines a true-power-on 360 degree absolute position information via SPI-interface. The sensor module is ideally suited for hollow shaft applications, e.g. robot joints. There are two pole ring variants with different diameters and pole pairs available.
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Data sheets
- EBx7914
Incremental sensor module with optional reference
- EBI7901CAx
FreePitch 1 mm
- EBI7901ZAx
FreePitch ≥ 2 mm
- EBI7903CAx
FixPitch 1 mm / additional Z pulse
- EBI7904CAx
FixPitch 1 mm / additional protective diodes
- EBR7912EBx
FixPitch 2 mm
- EMI7913
Sensor module for linear motors
CAD drawing
- EBx7900 familiy
3D-PDF
Your contact person
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.