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KMI16 Datasheet(PDF) 4 Page - NXP Semiconductors |
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KMI16 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 12 page 2000 Sep 05 4 Philips Semiconductors Product specification Integrated rotational speed sensor KMI16/1 FUNCTIONAL DESCRIPTION The KMI16/1 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 KMI16/1 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 (see Fig.4). The digital output signal level is independent of the sensing distance within the measuring range (see Fig.10). A (3-wire) output current enables safe transfer of the sensor signal to the detecting circuit (see Fig.5). The integrated circuit housing is separated from the sensor element housing to optimize the sensor behaviour at high temperatures. handbook, halfpage y z xx IC sensor magnet with direction of magnetization MBK767 Fig.2 Component detail of the KMI16/1. handbook, full pagewidth gear wheel magnet magnetic field lines (a) (b) (c) direction of motion (d) MRA957 sensor y z Fig.3 Functional principle. |
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