KMT36H-TD Measurement Specialties Inc/Schaevitz, KMT36H-TD Datasheet - Page 5

• Manufacturer Part Number: KMT36H-TD
• Description: SENSOR ANGULAR 360 DEGREES TDFN8
• Manufacturer: Measurement Specialties Inc/Schaevitz

Specifications of KMT36H-TD

• Position - Sensing: 360°
• Sensor Type: Angular - Magnetoresistive
• Voltage - Supply: 12V
• Operating Temperature: -40°C ~ 125°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 356-1084-2; G-MRCO-021

0
KMT36H 360° Angular Sensor
TYPICAL PERFORMANCE CURVES
SIGNAL EVALUATION
180° EVALUATION
As output voltages (V
(see fig. 3). At first the true offsets must be subtracted from the raw signals. The field angle
180° -range then can be calculated in the following manner:
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.
360° EVALUATION
In order to distinguish between
positive, the other with negative coil current. In the next step the change in the signals due to the
influence of the coil current must be calculated. The sign of these coil-induced output voltage changes
gives the 360° -information by case differentiation (see figure 4). In principle, this 360° discrimination
needs to be computed only once at start up. Nevertheless, it is recommended to check the
measurement periodically.
KMT36H Rev 2
V1 = Vo2-Vo1
90
Figure 3: output voltages
field angle in deg
V2 = Vo3-Vo2
1
180
, V
2
, V
3
) we use the three possible differences between the three signal outputs
270
V3 = Vo1 -Vo3
and
1
2
arctan
+180° two additional measurements are needed: one with
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2
0
Figure 4: output voltage change due to coil influence
Vm
Vn
3
V1 (+Icoil) - V1 (-Icoil)
V3(+Icoil) - V3(-Icoil)
1
90
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




field angle in deg
180
V2(+Icoil) - V2(-Icoil)
270
august_2010
in a
360