Datenblatt-Suchmaschine für elektronische Bauteile |
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KA3016D Datenblatt(PDF) 10 Page - Fairchild Semiconductor |
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KA3016D Datenblatt(HTML) 10 Page - Fairchild Semiconductor |
10 / 18 page KA3016D CD-ROM PRODUCTS 10 MIC-99D001 January 1999 5. ROTATIONAL DIRETION DETECTION • The forward and the reverse rotations of the CD are simply detected by using the D-F/F and the truth table is shown in the above table. • The rotational direction of the CD can be explained by the output waveforms of the hall sensors. Let the three outputs of hall sensors be H1, H2 and H3 respectively. When the spindle rotates in reverse direction, the hall sensor output waveforms are shown in Fig.(a). Thus the phases orderd in H1 →H2→H3 with a 120°C phase difference. On the other hand, if the spindle rotates in forwand rotation, the phase relationship is H3 →H2→H1 as shown in fig.(b). Therefore, the output of the rotational direction detector is low, when the spindle rotates forward, while high as in the case of the reverse rotation. 20 + − + − VCC DIR D-F/F D Q CK H2+ H3+ H3 − H2 − Rotation DIR Forward Low Reverse High 20 ( a) Reverse rotation H1 H2 H3 ( b) Forward rotaion H1 H2 H3 |
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Ähnliche Beschreibung - KA3016D |
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