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KMI15 Scheda tecnica(PDF) 4 Page - NXP Semiconductors |
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KMI15 Scheda tecnica(HTML) 4 Page - NXP Semiconductors |
4 / 16 page 2000 Sep 05 4 Philips Semiconductors Product specification Rotational speed sensor KMI15/4 FUNCTIONAL DESCRIPTION The KMI15/4 sensor is sensitive to the motion of ferrous gear wheels or reference marks. The functional principle is shown in Fig.3. Due to the effect of flux bending, the different directions of magnetic field lines in the magnetoresistive sensor element will cause an electrical signal. Because of the chosen sensor orientation and the direction of ferrite magnetization, the KMI15/4 is sensitive to movement in the ‘y’ direction in front of the sensor only (see Fig.2). The magnetoresistive sensor element signal is amplified, temperature compensated and passed to a Schmitt-trigger in the conditioning integrated circuit (Figs 4 and 5). The digital output signal level (see Fig.6) is at a fixed level independent of the sensing distance. A (2-wire) output current enables safe sensor signal transport to the detecting circuit (see Fig.7). The integrated circuit housing is separated from the sensor element housing to optimize the sensor behaviour at high temperatures. The strength of the magnetic field caused by the Ferroxdure 100 magnet in the different sensor directions, measured at the centre of the magnetoresistive bridge, is typically: Hx = 7 kA/m (auxiliary field) and Hz = 17 kA/m (perpendicular to the sensor surface). Hy is zero due to the trimming process. Fig.2 Component detail of the KMI15/4. handbook, halfpage y z xx IC sensor magnet with direction of magnetization MBH779 Fig.3 Functional principle. handbook, full pagewidth gear wheel magnet magnetic field lines (a) (b) (c) direction of motion (d) MRA957 sensor y z |
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