data sheet 1 2000-07-01 the differential magnetoresistive sensor fp 210 d 250-22 consists of two series coupled d-type insb/nisb semiconductor resistors. the resitance value of the mrs, which are mounted onto an insulated ferrite substrate, can be magnetically controlled. the sensor is encapsuled in a plastic package with three in-line contacts extending from the base. the basic resistance of the total system in the unbiased state is 2 250 w . a permanent magnet which supplies a biasing magnetic field is built into the housing. type ordering code fp 210 d 250-22 q65210-d250-w5 differential magnetoresistive sensor fp 210 d 250-22 version 2.0 dimensions in mm features ? high operating temperature ? high output voltage ? robust cylindrical housing ? biasing magnet build in ? signal amplitude independent of speed ? easily connectable typical applications ? detection of speed ? detection of position ? detection of sense of rotation ? angle encoder ? linear position sensing
data sheet 2 2000-07-01 fp 210 d 250-22 absolute maximum ratings electrical characteristics ( t a = 25 c) 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 v out . parameter symbol limit values unit operating temperature t a C 40 / + 140 c storage temperature t stg C 40 / + 150 c power dissipation 1) p tot 400 mw supply voltage 2) v in 7.5 v insulation voltage between terminals and casing v i > 100 v thermal conductivity g tha 3 5 mw/k nominal supply voltage v in n 5v total resistance, ( d = , i 1 ma) r 1-3 1000 ? 1600 w center symmetry 3) ( d = ) m 10 % offset voltage 4) (at v in n and d = ) v 0 130 mv open circuit output voltage 5) (at v in n and d = 0.2 mm) v out pp > 1100 mv cut-off frequency f c > 20 khz 1) corresponding to diagram p tot = f ( t a ) 2) corresponding to diagram v in = f(t a ) 3) 4) corresponding to measuring circuit in fig. 2 5) corresponding to measuring circuit in fig. 2 and arrangement as shown in fig. 1 m r 12 C r 23 C C r 12 C ---------------------------- = 100% for r 1-2 > r 2-3
data sheet 3 2000-07-01 fp 210 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 (see figure 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 v out . the output voltage v out without excitation then is 0 v when the offset is compensated. figure 1 schematic representation of a toothed wheel actuating an fp 210 d 250-22 figure 2 measuring circuit and output voltage v out waveform
data sheet 4 2000-07-01 fp 210 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 figure 3 ). figure 3 arrangement for analogue application maximum supply voltage versus temperature v in = f ( t a ), d =
data sheet 5 2000-07-01 fp 210 d 250-22 output voltage (typical) versus temperature v outpp = f ( t a ), d = 0.2 mm v outpp at t a = 25 c 100% total resistance (typical) versus temperature r 1-3 = f ( t a ), d = output voltage (typical) versus airgap v outpp = f ( d ), t a = 25 c v outpp at d = 0.2 mm 100% max. power dissipation versus temperature p tot = f ( t a ), d = ^ = ^ =
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