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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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FS9721_LP3 Fiches technique(PDF) 32 Page - Fortune Semiconductor Corp. |
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FS9721_LP3 Fiches technique(HTML) 32 Page - Fortune Semiconductor Corp. |
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32 / 39 page  FS9721_LP3 Rev. 2.1 32/39 15.14 Capacitance Measurement R21 57.4k R19 900k RCAP SMV SGND PTC 1k Cap COM CX FS9721_LP3 J3 J5 DO- DO+ DO- DO+ CMP DO+ DO- + - VDD AGND 3/4VDD 1/4VDD R31 10k Input Typical Waveforms 3/4VDD 1/4VDD VDD Tdo Diagram 31 Capacitance Measurement Capacitance measurement is to charge/discharge the measuring capacitance through R21 to form a oscillation, then calculate the cycle of oscillation to get the capacitance value. To adjust R21 can calibrate the value in capacitance measurement. J3 and J5 are mode switches. When doing capacitance measurement, J3 and J5 are close. 15.15 Frequency Measurement ADP SGND R29 1M COM Hz FS9721_LP3 R27 100k J6 J8 PTC 1k R31 10k C15 10uF Diagram 32 Frequency Measurement |
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