Q65212-D2504资料

Differential Magnetoresistive SensorFP 212 D 250-22

Features••••

High output voltage

High operating temperatureRobust plastic housingSignal amplitude is speedindependent

•Biasing magnet build in•Marking greenTypical applications•Detection of speed•Detection of position•Detection of sense ofrotation

•Angle encoder

•Linear position sensing

Dimensions in mm

TypeFP 212 D 250-22Ordering CodeQ65212-D2504The differential magnetoresistive sensor FP 212 D 250-22 consists of two series coupledmagneto resistors (D-type InSb/NiSb semiconductor resistors whose value can bemagnetically controlled) which are mounted onto an insulated ferrite substrate. Thesensor is encapsulated in a plastic package and has three connecting terminals. Thebasic resistance of the total system is 2×250Ω. A permanent magnet which supplies abiasing magnetic field is fixed on the base of the sensor.Semiconductor Group

1

07.96

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FP 212 D 250-22

Maximum ratingsParameterOperating temperatureStorage temperaturePower dissipation1)Supply voltage2)Insulation voltage betweenterminals and magnetThermal conductivity(when soldered)Characteristics (TA = 25°C)Nominal supply voltageTotal resistance, (δ =∞,I≤ 1 mA)air gap (δ =∞)Center symmetry3) (δ =∞)Offset voltage4)(atVIN N andδ =∞)Open circuit output voltage5)(at VIN N andδ = 0.2 mm)Cut-off frequencyMeasuring 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 thetemperature dependence of the output voltageVOUT.

SymbolValue– 40/ + 140– 40/ + 15045010> 60≥ 5Unit°C°CmWVVmW/KTATstgPtotVINVIGthAVIN NR1-3MV0Vout ppfc51000…1600≤ 10≤ 130> 1100> 20VΩ%mVmVkHz1)Corresponding to diagramPtot =f(TA)2)Corresponding to diagramVIN =f(TA)3)R1–2–R2–3

M=----------------------------× 100% forR1-2 >R2-3

R1–2

4)Corresponding to measuring circuit inFig. 2

5)Corresponding to measuring circuit inFig. 2 and arrangement as shown inFig. 1

Semiconductor Group2

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FP 212 D 250-22

1. Digital revolution counting

For digital revolution counting, the sensor should be actuated by a magnetically soft irontoothed wheel. The tooth spacing should correspond to about twice the magneto resistorintercenter spacing i.e. 2×1.6 mm (seeFig. 1).

The two resistors of the sensor are supplemented by two additional resistors in order toobtain the sensor output voltage as a bridge voltageVOUT. The output voltageVOUTwithout 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 voltageVOUT waveform

Semiconductor Group3

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FP 212 D 250-22

2. Linear distance measurement

To convert small distances into a proportional electric signal, a small soft iron part ofdefinite 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. Thesinusoidal output signal gives a voltage proportional to distance in the zero crossoverregion (seeFig. 3).

Fig. 3

Arrangement for analogue application

Maximum supply voltageversus temperatureVIN =f(TA)

Semiconductor Group4

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Output voltage (typical) versus

temperatureVOUTpp =f(TA),δ = 0.2 mm

VOUTpp atTA = 25°C=^ 100%Total resistance (typical)

versus temperatureR1-3 =f(TA),δ =∞Semiconductor GroupFP 212 D 250-22

Output voltage (typical) versus

airgapVOUTpp =f(δ),TA = 25°C

VOUTpp atδ = 0.2 mm=^

100%Max. power dissipationversus temperaturePtot =f(TA),δ =∞

5