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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8325 датащи(PDF) 49 Page - Wolfson Microelectronics plc |
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WM8325 датащи(HTML) 49 Page - Wolfson Microelectronics plc |
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49 / 254 page  Production Data WM8325 w PD, February 2012, Rev 4.0 49 13.3 CRYSTAL OSCILLATOR CONNECTIONS The crystal oscillator generates a 32.768kHz reference clock, which is used to provide reference clock for the Real Time Clock (RTC) in the WM8325. The oscillator requires an external crystal on the XTI and XTO pins, as well as two capacitors, connected as shown in Figure 17. XTO WM8325 Crystal Oscillator XTI C1 C2 32kHz Cp Cxt Lxt Rxt Crystal Model XOSCGND Figure 17 Crystal Oscillator A suitable crystal oscillator should be selected in accordance with the following requirements: PARAMETER MIN MAX UNITS Nominal frequency 32.768 kHz Series resistance 50 70 k Maximum driving level 0.5 W Table 18 Selection of Crystal Oscillator Component The load capacitors C1 and C2 should be selected according to the recommended load capacitance, CL of the crystal, which is given by the following equation: Assuming C1 = C2 and CSTRAY = 2.75pF (typical pad i/o capacitance), then: C1 = C2 = 2 x (CL - 2.75pF). For example, if the crystal has a load capacitance CL = 9pF, then C1 = C2 = 12.5pF. If a suitable 32.768kHz clock is already present elsewhere in the system, it is possible for the WM8325 to use that external clock instead. The external clock should be applied to pin XTI, and the XTO pin left floating in this case. |
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