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IC-MZ Datasheet(PDF) 9 Page - IC-Haus GmbH |
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IC-MZ Datasheet(HTML) 9 Page - IC-Haus GmbH |
9 / 11 page iC-MZ DIFFERENTIAL HALL SWITCH Rev A3, Page 9/11 APPLICATION EXAMPLES Gear wheel scanning Logging the position and rotation of a gear wheel with iC-MZ requires that the gear wheel is made of a soft magnetic basic material with which a magnetic field applied externally through the gear geometry can be modulated. The strength of the modulation is greatest at the gear rim, calling for iC-MZ to be placed at the shortest possible operating distance to the gear wheel. The necessary external bias field is generated by a back bias magnet placed behind iC-MZ. The magnet should be positioned central to the package so that the two Hall sensors are impinged by equal magnetic field strengths and a field strength offset is avoided; the lat- ter would make a greater difference in modulation field strength necessary for switching purposes. Field ho- mogeneity can be improved by placing a pole piece between the magnet and iC-MZ. The strength of the magnetic field modulation depends not just on the operating distance and the intensity of the bias field but also on the module and addendum of the gear wheel. The distance of the teeth along the perimeter of the wheel stipulates the cycle with which the magnetic field strength is modulated. An optimum modulation depth is achieved when the gear wheel ge- ometry is selected so that the two Hall sensors on the chip are opposite a tooth or a gap and the sensors pro- vide signals in antiphase. With the given iC-MZ sensor distance of 2 mm a tooth distance of about 4 mm is ad- vantageous but not imperative. Even if the geometry of the wheel is not adapted to suit the sensor, the signals generated by the two Hall sensors share a fixed phase relation. Figure 9 illustrates the typical course of magnetic in- duction B = µ0 · H at the two Hall sensors, dependent on angle of rotation φ of the gear wheel. In an ensuing amplification process analog signals VA and VNA are formed from the differential signal; digital signals VD and VND are generated by the back-end comparator with hysteresis. P S1 S2 B 1 B 1 B 2 BT,hi B-B 12 B B 2 iC-MZ bias magnet bias field N S gear wheel V P P/2 V NA V A V dc 3P/2 P P/2 3P/2 V D BT,lo VB P P/2 3P/2 V ND VB 0 P/2 0 P 3P/2 Figure 9: Gear wheel scanning |
Similar Part No. - IC-MZ_11 |
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Similar Description - IC-MZ_11 |
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