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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC9401 датащи(PDF) 18 Page - Microchip Technology |
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TC9401 датащи(HTML) 18 Page - Microchip Technology |
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18 / 24 page  TC9400/9401/9402 DS21483C-page 18 © 2006 Microchip Technology Inc. 8.0 F/V POWER-ON RESET In F/V mode, the TC9400 output voltage will occasion- ally be at its maximum value when power is first applied. This condition remains until the first pulse is applied to FIN. In most frequency measurement appli- cations, this is not a problem because proper operation begins as soon as the frequency input is applied. In some cases, however, the TC9400 output must be zero at power-on without a frequency input. In such cases, a capacitor connected from Pin 11 to VDD will usually be sufficient to pulse the TC9400 and provide a Power-on Reset (see Figure 8-1 (a) and (b)). Where predictable power-on operation is critical, a more complicated circuit, such as Figure 8-1 (b), may be required. FIGURE 8-1: Power-On Operation/Reset VDD 14 11 1000 pF Threshold Detector 1 k Ω FIN VDD 100 k Ω 1 μF 3 4 8 6 FIN 1 2 5 16 VCC B R C Q VSS A CLRA CD4538 TC9400 (a) (b) To TC9400 |
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