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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB2240 датащи(PDF) 35 Page - Microchip Technology |
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USB2240 датащи(HTML) 35 Page - Microchip Technology |
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35 / 43 page  2010 - 2015 Microchip Technology Inc. DS00001979A-page 35 USB224X 10.0 AC SPECIFICATIONS 10.1 Oscillator/Crystal Parallel Resonant, Fundamental Mode, 24 MHz ± 350 ppm. TABLE 10-1: CRYSTAL CIRCUIT LEGEND Note 10-1 C0 is usually included (subtracted by the crystal manufacturer) in the specification for CL and should be set to ‘0’ for use in the calculation of the capacitance formulas in Figure 10-2, "Capacitance Formulas". However, the OEM PCB itself may present a parasitic capacitance between XTAL1 and XTAL2. For an accurate calculation of C1 and C2, take the parasitic capacitance between traces XTAL1 and XTAL2 into account. Note 10-2 Each of these capacitance values is typically approximately 18 pF. FIGURE 10-1: TYPICAL CRYSTAL CIRCUIT SYMBOL DESCRIPTION IN ACCORDANCE WITH C0 Crystal shunt capacitance Crystal manufacturer’s specification (See Note 10-1) CL Crystal load capacitance CB Total board or trace capacitance OEM board design CS Stray capacitance MCHP IC and OEM board design CXTAL XTAL pin input capacitance MCHP IC C1 Load capacitors installed on OEM board Calculated values based on Figure 10-2, "Capacitance Formulas" (See Note 10-2) C2 FIGURE 10-2: CAPACITANCE FORMULAS XTAL1 (CS1 = CB1 + CXTAL1 ) XTAL2 (CS2 = CB2 + CXTAL2 ) C1 C2 CL 1 M Crystal C0 C1 = 2 x (CL – C0) – CS1 C2 = 2 x (CL – C0) – CS2 |
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