The KMT39 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[gt]25 kA/m. The sensor
contains two parallel supplied Wheatstone bridges, which enclose
a sensitive angle of 45 degrees.
With reduced accuracy, the sensor KMT39 may be used with a
field strength of H0 ≥ 15 kA/m (at room temperature). Most
magnets show a decreasing field strength with temperature while
the magnetic field direction is unchanged.
A rotating magnetic field in the surface parallel to the chip plane will therefore deliver two independent sinusoidal
output signals, one following a cos(2α) and the second following a sin(2α) function, α being the angle between
sensor and the magnetic field direction.
Features:
· AMR sensor with 180° signal period
· for the use at moderate field strengths
· small TDFN package with wetable flanks
· Contactless angular position, ideal for harsh environments
· Design optimized for linearity
· Very high resolution
· High accuracy
· Low power consumption
· Self diagnosis feature
· Attractive small form factor
· User has complete control over signal evaluation
· Extended operating temperature range (-40 °C to +150 °C)
· REACH [&] RoHS compliant (lead free)
Applications:
· Absolute and incremental angle measurement in harsh environments
· Automotive applications (steering angle, steering torque, throttle, wiper, …)
· Position feedback in robotics
· Camera positioning
· Potentiometer replacement
· Position measurement in medical applications
· Motor motion control
