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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IMX8MPCEC датащи(PDF) 30 Page - NXP Semiconductors |
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IMX8MPCEC датащи(HTML) 30 Page - NXP Semiconductors |
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30 / 111 page  i.MX 8M Plus Applications Processor Datasheet for Consumer Products, Rev. 0, 03/2021 30 NXP Semiconductors Electrical characteristics capacitors implements a low power oscillator. Figure 4. Crystal model and external components Table 17. 32K crystal specifications Parameter Description Min Typ Max Unit Frequency — 32.768 — kHz Cload1 1 CL is the load capacitance of the crystal that is recommended by the crystal vendors to obtain target clock frequency. CL is given by the following formula: CL = {CL1 x CL2 / (CL1 + CL2)} + PCB strays —12.5 — pF Drive level2 2 Actual working drive level is depend on real design. Please contact crystal vendor for selecting drive level of crystal. —— 1 µW ESR3 3 ESR is the equivalent series resistance of the crystal. — 70K — — Rf (feedback resistor)4 4 Rf is the feedback resistor to bias the amplifier. A larger value of Rf is preferred at lower frequencies. 4.7 — — M Rs (series resistor)5 5 Rs is the series resistor to limit amplifier gain and reduce power dissipation in the crystal. 0— 1 M |
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