TL915 TMR FixPitch sensor for angle measurement

The TL915 is a FixPitch sensor based on the Tunnel MagnetoResistive (TMR) effect. 

The sensor offers

  • Extremely low harmonic output signals
  • Non-contacting measurement
  • A large working distance
  • High signal amplitudes with simultaneously low offset voltages
  • High stability across the temperature application range

The sensor is FixPitch sensor that can be used on a fixed magnetic pole pitch.

The sensor design 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

General information

The TL915 consists of two Wheatstone bridges at an angle of 90° to each other. The sensor delivers a sine and a cosine output signal (one period ) at a north and a south pole (pole pair)

The TL915 features PerfectWave technology and delivers extremely low harmonic output signals.

NameHousingAmplitudeOffsetBridge resistor
TL915ACAChip100 mV/V±15 mV/V12 kΩ

TL915

The TL915 is a FixPitch sensor for use with a pole ring at the shaft circumference or a linear magnetic scale.

The sensor is available as a bare die and suitable for COB assembly on a PCB edge.

The sensor is currently under development.

Please ask us for further information or samples.

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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 resistors 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.