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參數(shù)資料
| 型號： | C166 |
| 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(shù)： | 17/45頁 |
| 文件大?。?/td> | 654K |
| 代理商： | C166 |
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AP242005 07.99
Crystal Oscillators of the
C500 / C166 Microcontroller Family
6.3
Safety Factor
The Safety Factor SF is the relation between maximum test resistance R
Qmax
, which can be added
in series to the quartz crystal but it is still oscillating, and the maximum load resonance resistance
R
Lmax
. It gives a feeling of how much the resistance of the passive part of the oscillator circuitry can
be increased (caused by the drive level dependence of the crystal) until the oscillation does not start
any more. Depending on production quality and long time behavior of all parts of the oscillator
circuitry, the Safety Factor needs a certain minimum value to grant a problem-free operation of the
oscillator for mass production and during life time. The qualification of the Safety Factor shown in
table 3 is based on the experience of the Tele Quarz Group.
Safety Factor:
Load Resonance Resistance:
Note: For oscillation frequencies higher than 24MHz it is strongly recommended to check whether
the Safety Factor which can be achieved is sufficient for the system. In case the Safety
Factor is not sufficient in fundamental mode, it is possible to use 3rd overtone mode (see
appendix).
Table 3
Qualification of the Safety Factor
Safety Factor
Qualification
SF < 1.5
1.5
≤
SF
<
2
2
≤
SF
<
3
3
≤
SF
<
5
SF
≥
5
unsuitable
risky
suitable
safe
very safe
SF
RLmax
RQmax
=
RLmax
R1max
1
C0typ
CL
----------------
+
2
=
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