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MSM9802 Datasheet(PDF) 40 Page - OKI electronic componets |
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MSM9802 Datasheet(HTML) 40 Page - OKI electronic componets |
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40 / 52 page  40/51 MSM9802/03/05-xxx ¡ Semiconductor 5.1 Determining RC constants The RC oscillation frequency characteristics are shown in Figure 5.2. If fosc is set to 256 kHz, use the following values as a guide (see Figure 5.2) to set the C and R2 that fit the printed-circuit board type used. R1=100 kW, R2=30 kW, C=30 pF When choosing RC oscillation, the RC oscillation frequency varies according to the fluctuation of the external C and R2. 5.2 Fluctuation of RC oscillation frequencies When choosing RC oscillation, the error of RC oscillation frequency due to process variations of the IC is ±4% maximum, and the fluctuation of the RC oscillation frequency when using a capacitor (C) of ±1% accuracy and a resistor (R2) of ±2% accuracy is a maximum of ±7% approximately. 6. Ceramic Oscillation Figure 6.1 shows an external circuit using a ceramic oscillator. OSC1 OSC2 C1 C2 Figure 6.1 Ceramic Oscillation Diagram |
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