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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD404339FS датащи(PDF) 30 Page - Renesas Technology Corp |
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HD404339FS датащи(HTML) 30 Page - Renesas Technology Corp |
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30 / 80 page  HD404339 Series 28 Table 4 Oscillator Circuit Examples Circuit Configuration Circuit Constants External clock operation External oscillator OSC Open 1 OSC 2 Ceramic oscillator (OSC 1, OSC 2) OSC 2 C1 2 C OSC 1 Rf Ceramic GND Ceramic oscillator: CSA4.00MG (Murata) R f = 1 MΩ ±20% C 1 = C2 = 30 pF ±20% Crystal oscillator (OSC 1, OSC 2) OSC 2 C1 2 C OSC 1 Rf Crystal GND L S C RS C0 OSC1 OSC2 R f = 1 MΩ ±20% C 1 = C2 = 10 to 22 pF ±20% Crystal: Equivalent to circuit shown below C 0 = 7 pF max. R S = 100 Ω max. Crystal oscillator (X1, X2) X1 C1 2 C X2 Crystal GND L S C RS C0 X1 X2 Crystal: 32.768 kHz: MX38T (Nippon Denpa) C 1 = C2 = 20 pF ±20% R S = 14 kΩ C 0 = 1.5 pF Notes: 1. Since the circuit constants change depending on the crystal or ceramic oscillator and stray capacitance of the board, the user should consult with the crystal or ceramic oscillator manufacturer to determine the circuit parameters. 2. Wiring among OSC 1, OSC 2, X1, X2 and elements should be as short as possible, and must not cross other wiring (see figure 19). 3. When a 32.768-kHz crystal oscillator is not used, fix pin X1 to GND and leave pin X2 open. |
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