參數(shù)資料
型號(hào)： 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(yè)數(shù)： 20/55頁(yè)
文件大小： 495K
代理商： C500
20 of 55
AP242401 04.99
Ceramic Resonator Oscillators of the
C500 / C166 Microcontroller Family
7.2.4 Stability Matrix for the external feedback Resistor R
f
This stability matrix is used to find an appropriate value for R
f
if the oscillator circuit shows spurious
oscillation and variation of C
X1
= C
X2
and R
x2
does not solve the problem. The way of proceeding
is identical to the stability matrices described in the chapters above. It is recommended to use
values for R
f
within the range of 10 k
≤
R
f
≤
100k
. The table below shows an example for a
stability matrix with R
f
characteristics.
7.2.5 Stability Matrix for a Combination of C
X1
, C
X2
, R
x2
and R
f
If the stability matrices for C
X
\C
X2
, C
X
=C
X2
\R
x2
and C
X
=C
X2
\R
f
do not result in a reliable oscillation
then a stability matrix for a combination of C
X1
, C
X2
, R
x2
and R
f
has to be performed. Depending on
the results of the stability matrices before, two parameters for instance R
x2
and R
f
are set to fix
values and the others C
X1
and C
X2
are used as variables for the analysis in the two dimensional
stability matrix. But this is a very seldom case and is only mentioned for completeness.
Table 7 :
Example for a Stability Matrix (R
f
Charcteristics)
C
X2
= C
X1
\ R
f
10 k
ok
33 k
ok
100 k
1 M
1st
0 pF
10 pF
ok
ok
1st
15 pF
ok
1st
1st
22 pF
ok
1st
1st
33 pF
ok
1st
1st
47 pF
ok
1st
1st
82 pF
ok
1st
1st
100 pF
ok
1st
1st
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