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SFH7740 Datasheet(PDF) 8 Page - OSRAM GmbH |
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SFH7740 Datasheet(HTML) 8 Page - OSRAM GmbH |
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8 / 14 page ![]() SFH 7740 2009-01-14 8 Figure 2 Startverhalten Start-up sequence OHF03836 t Out t t1 1 t High Low For reflector For absorber or no reflector dd V Vdd_start max dd_start min V Default Low 60 ms - t 120 ms + 1 Undefined high or low output impedance Der Ausgang ist immer hochohmig, wenn an V dd keine Spannung angeschlossen ist. Wenn die Versorgungsspannung V dd, start erreicht, bleibt der Ausgang für 60ms < tstart <120ms auf „low“. Anschließend findet etwa alle 90ms eine Messung des reflektierten Signals statt und der Ausgang wird entprechend geschalten (Figure 3). If the supply voltage at V dd is not connected, the output is always high ohmic. When supply voltage reaches V dd, start , the sensor output stays low for 60ms < tstart <120ms. Subsequently approx. every 90ms the reflected signal is measured and the output is set accordingly (Figure 3). Figure 3 Timing diagram OHF03835 t Out t tpulse refresh t High Low For reflector For absorber or no reflector f Ι |
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