TL915 TMR FixPitch sensor for angle measurement
General information
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
Design features
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.
Application examples
Suitable for absolute or incremental applications (linear or rotary motion) e.g.:
- Motor commutation
- Speed measurement
Product overview
| Name | Housing | Amplitude | Offset | Bridge resistor |
|---|---|---|---|---|
| TL915ACA | Chip | 100 mV/V | ±15 mV/V | 12 kΩ |
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.
Further application possibilities
TL915 at linear measurement scale.
FixPitch Design – sensor structures are adapted to the scale division – this ensures a very good signal quality.
The signal amplitude of a TMR sensor is significantly larger than with AMR or GMR and remains almost constant even over a long working distance.
Thanks to the FixPitch design, the measurement errors are low over a wide working distance range.
Data sheets
- TL915
FixPitch sensor
Product information
- TL915
Evaluation Board
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 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.