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KMT32B Magnetic Angle Sensor
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AMR Sensor with 180° period
high accuracy
high resolution
for the use at moderate field strengths
tiny TDFN package
TDFN
SO8
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ROHS & REACH compliant
DESCRIPTION
The KMT32B is a magnetic field sensor based on the anisotropic magneto resistance effect, i.e. it is sensing
the magnetic field direction independently on the magnetic field strength for applied field strengths
H>25 kA/m. The sensor contains two parallel supplied Wheatstone bridges, which enclose a sensitive angle
of 45 degrees.
A rotating magnetic field in the surface parallel to the chip (x-y plane) will therefore deliver two independent
sinusoidal output signals, one following a cos(2 ? ) and the second following a sin(2 ? ) function, ? being the
angle between sensor and field direction (see Figure 2).
The KMT32B magnetic field sensor is suited for high precision angle measurement applications at a regular
field strength of H 0 ≥ 25 kA/m (generated for example with magnet 67. 044 from Magnetfabrik Bonn at a
distance of 5.2 mm at room temperature). With reduced accuracy, the sensor KMT32B may be used with a
field strength of H 0 ≥ 14 kA/m (at room temperature; be aware of the influence of the earth magnetic field!).
Most magnets show a decreasing field strength with temperature while the magnetic field direction is
unchanged.
FEATURES
APPLICATIONS
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Contactless angular position, ideal for harsh
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Absolute and incremental angle measurement
environments
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Design optimized for linearity
High accuracy
Low cost, low power
Self diagnosis feature
Attractive SMD packages
User has complete control over signal
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Automotive (steering angle, torque)
Robotics
Camera positioning
Potentiometer replacement
Position measurement in medical applications
Motor motion control
evaluation
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Extended operating temperature range
(-40 °C to +150 °C, +160°C on request)
REACH & RoHS compliant (lead free)
KMT32B Rev 6
www.meas-spec.com
1/6
2013-July
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