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NE555 Datasheet(PDF) 8 Page - ARTSCHIP ELECTRONICS CO.,LMITED. |
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NE555 Datasheet(HTML) 8 Page - ARTSCHIP ELECTRONICS CO.,LMITED. |
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8 / 18 page  NE555,SA555,SE555 PRECISION TIMERS www.artschip.com 8 APPLICATION INFORMATION Missing-pulse detector The circuit shown in Figure 15 can be used to detect a missing pulse or abnormally long spacing between consecutive pulses in a train of pulses. The timing interval of the monostable circuit is retriggered continuously by the input pulse train as long as the pulse spacing is less than the timing interval. A longer pulse spacing, missing pulse, or terminated pulse train permits the timing interval to be completed, thereby generating an output pulse as shown in Figure 16. Pin numbers shown are shown for the D, JG, P, PS, and PW package. Figure 15. Circuit for Missing-Pulse Detector Time – 0.1ms/div Figure 16. Completed-Timing Waveforms For Missing-Pulse Detector Frequency divider By adjusting the length of the timing cycle, the basic circuit of Figure 9 can be made to operate as a frequency divider. Figure 17 shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle. Time – 0.1 ms/div Figure 17. Divide-by-Three Circuit Waveforms Pulse-width modulation The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by applying and external voltage (or current) to CONT. Figure 18 shows a circuit for pulse-width modulation. A continuous input pulse train triggers the monostable circuit, and a control signal modulates the threshold voltage. Figure 19 shows the resulting output pulse-width modulation. While a sine-wave modulation signal is shown, any wave shape could be used. |
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