參數資料
型號: C500
廠商: SIEMENS AG
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 14/55頁
文件大小: 495K
代理商: C500
14 of 55
AP242401 04.99
Ceramic Resonator Oscillators of the
C500 / C166 Microcontroller Family
6.2
Suppression of RC and LC Oscillation
If the ceramic resonator works just as a capacitor then changing the external circuit condition can
disable this irregular oscillation. This can be achieved by:
ì
Change the values of the loading capacitors with the relation C
X1
= C
X2
ì
Change the values of the loading capacitors with the relation C
X1
C
X2
ì
Add a series damping resistor R
x2
ì
Add an external feedback resistor R
f
If no solution is found a re-layout of the PCB might be required.
Note: A small inductance of the printed pattern (oscillator) may enable oscillation by creating LC
oscillation at high frequency. In such cases, it appears as if the circuit does not start-up when
powered on, however, a small R
x2
of 10 - 20
may solve the problem.
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