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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD404849FS датащи(PDF) 45 Page - Renesas Technology Corp |
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HD404849FS датащи(HTML) 45 Page - Renesas Technology Corp |
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45 / 127 page  HD404849 Series 43 Table 22 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 oscillator GND Ceramic oscillator: CSA4.00MG (Murata) R f = 1 MΩ ± 20% C 1 = C2 = 30 pF ± 20% Crystal oscillator (OSC 1,OSC2) L S C RS C0 OSC1 OSC2 OSC 2 C1 2 C OSC 1 Rf Crystal oscillator GND R f = 1 MΩ ± 20% C 1 = C2 = 10 to 22 pF ± 20% Equivalent circuit of crystal oscillator shown at left. C 0: 7 pF max R S: 100 Ω max Crystal oscillator (X1, X2) X1 C1 2 C X2 Crystal oscillator GND L S C RS C0 X1 X2 Crystal: 32.768 kHz: MX38T (Nippon Denpa) C 1 = C2 = 20 pF ± 20% R S: 14 k Ω C 0: 1.5 pF Notes: 1. Circuit constants differ by the different types of crystal oscillators and ceramic oscillators, and with the stray capacitance of the board, so consult the manufacturer of the oscillator to determine the circuit parameters. 2. The wiring between the OSC 1 and OSC 2 pins (X1 and X2 pins) and the other elements should be as short as possible, and must not cross other wiring. Refer to figure 27. 3. If not using a 32.768-kHz crystal oscillator, fix the X1 pin to V CC and leave the X2 pin open. |
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