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Differential Magnetoresistive Sensor
FP 212 D 250-22
Features * * * * High output voltage High operating temperature Robust plastic housing Signal amplitude is speed independent * Biasing magnet build in * Marking green Typical applications * Detection of speed * Detection of position * Detection of sense of rotation * Angle encoder * Linear position sensing
Dimensions in mm
Type FP 212 D 250-22
Ordering Code Q65212-D2504
The differential magnetoresistive sensor FP 212 D 250-22 consists of two series coupled magneto resistors (D-type InSb/NiSb semiconductor resistors whose value can be magnetically controlled) which are mounted onto an insulated ferrite substrate. The sensor is encapsulated in a plastic package and has three connecting terminals. The basic resistance of the total system is 2x250 . A permanent magnet which supplies a biasing magnetic field is fixed on the base of the sensor. Semiconductor Group 1 07.96
FP 212 D 250-22
Maximum ratings Parameter Operating temperature Storage temperature Power dissipation1) Supply voltage2) Insulation voltage between terminals and magnet Thermal conductivity (when soldered) Characteristics (TA = 25 C) Nominal supply voltage Total resistance, ( = , I 1 mA) air gap ( = ) Center symmetry3) ( = ) Offset voltage4) (at VIN N and = ) Open circuit output voltage5) (at VIN N and = 0.2 mm) Cut-off frequency Measuring arrangements By approaching a soft iron part close to the sensor a change in its resistance is obtained. The potential divider circuit of the magneto resistor causes a reduction in the temperature dependence of the output voltage VOUT. Symbol Value - 40/ + 140 - 40/ + 150 450 10 > 60 5 Unit C C mW V V mW/K
TA Tstg Ptot VIN VI GthA
VIN N R1-3 M V0 Vout pp fc
5 1000...1600 10 130 > 1100 > 20
V % mV mV kHz
1) Corresponding to diagram Ptot = f(TA) 2) Corresponding to diagram VIN = f(TA) 3) R1 - 2 - R2 - 3 M = --------------------------- x 100% for R1-2 > R2-3 R1 - 2 4) Corresponding to measuring circuit in Fig. 2 5) Corresponding to measuring circuit in Fig. 2 and arrangement as shown in Fig. 1
Semiconductor Group
2
FP 212 D 250-22
1. Digital revolution counting For digital revolution counting, the sensor should be actuated by a magnetically soft iron toothed wheel. The tooth spacing should correspond to about twice the magneto resistor intercenter spacing i.e. 2x1.6 mm (see Fig. 1). The two resistors of the sensor are supplemented by two additional resistors in order to obtain the sensor output voltage as a bridge voltage VOUT. The output voltage VOUT without excitation then is 0 V when the offset is compensated.
Fig. 1
Schematic representation of a toothed wheel actuating an FP 212 D 250-22
Fig. 2
Measuring circuit and output voltage VOUT waveform
Semiconductor Group
3
FP 212 D 250-22
2. Linear distance measurement To convert small distances into a proportional electric signal, a small soft iron part of definite width (e.g. b = 1.8 mm) is moved over the face of the sensor. Proportional signals for distances up to 1.5 mm can be obtained in this way. The sinusoidal output signal gives a voltage proportional to distance in the zero crossover region (see Fig. 3).
Fig. 3
Arrangement for analogue application
Maximum supply voltage versus temperature VIN = f(TA)
Semiconductor Group
4
FP 212 D 250-22
Output voltage (typical) versus temperature VOUTpp = f(TA), = 0.2 mm = VOUTpp at TA = 25 C ^ 100%
Output voltage (typical) versus airgap VOUTpp = f(), TA = 25 C = VOUTpp at = 0.2 mm ^ 100%
Total resistance (typical) versus temperature R1-3 = f(TA), =
Max. power dissipation versus temperature Ptot = f(TA), =
Semiconductor Group
5

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