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PDF KMT36H Data sheet ( Hoja de datos )

Número de pieza KMT36H
Descripción Magnetic Angle Sensor
Fabricantes TE 
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KMT36H 360°
Magnetic Angle Sensor
SPECIFICATIONS
AMR Sensor with 360° capability
TDFN outline 2.5x2.5x0.75 mm3
Three 120° phase-shifted signals
Moderate field strength requirements
The KMT36H is a magnetic field sensor utilizing the anisotropic
magneto resistance effect. Therefore the sensor is sensing the
magnetic field direction rather than the magnetic field strength.
The sensor contains three Wheatstone bridges rotated by 120°. A
rotating magnetic field (typical strength 25 kA/m in the sensor
plane) will result in three sinusoidal output signals with a period of
180°, phase shifted by 60° field angle. By use of a modified atan
algorithm the field angle can be calculated with high accuracy.
As an unique feature, the KMT36H is able to measure full 360° by
utilizing an additional magnetic field which is generated by a planar
coil that is integrated on the chip. The 180°/360° determination is
done by a simple sign distinction and may be computed periodically
or only once at power up.
FEATURES
Ideal for harsh environments due to
magnetic sensing principle
Contactless absolute angular measurement
over 360°
Accuracy better than +/- 0.5°
Three bridge signals with 120° phase
difference
Tiny TDFN-housing 2.5 x 2.5 x 0.8 mm3
APPLICATIONS
Absolute angle measurement
Potentiometer replacement
Motor motion control
Camera positioning
Robotics
SENSOR SOLUTIONS /// KMT36H 360° Rev 5
1/2016
Page 1

1 page




KMT36H pdf
KMT36H 360°
Angular Sensor
TAPE AND REEL PACKAGING INFORMATION
DESCRIPTION
KMT36H
REEL SIZE
7”
UNITS/REEL
3,000
PIN 1 ORIENTATION
NOTE
Top-right of sprocket hole side
KMT36H/SO 13”
2,500
Top-left of sprocket hole side
TYPICAL PERFORMANCE CURVES
0 90 180 270 360 0 90 180 270 360
field angle in deg
V1= Vo2-Vo1
V2 = Vo3-Vo2
V3 = Vo1-Vo3
field angle in deg
V1(+Icoil) - V1(-Icoil)
V2(+Icoil) - V2(-Icoil)
V3(+Icoil) - V3(-Icoil)
Figure 3: output voltages
Figure 4: output voltage change due to coil influence
SIGNAL EVALUATION
180° EVALUATION
As output voltages (V1, V2, V3) we use the three possible differences between the three signal outputs (see fig. 3).
At first the true offsets must be subtracted from the raw signals. The field angle in a 180°-range then can be
calculated in the following manner:
1
2
arctan 
2
Vn
Vm
3
1

Using the three possible combinations of output signals (m,n = 1,2 ; 2,3 ; 3,1) three results are obtained, which can
be averaged to increase accuracy. Comparing the three results gives additional information about their reliability.
SENSOR SOLUTIONS /// KMT36H 360° Rev 5
1/2016
Page 5

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