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参数资料
| 型号： | C166 |
| 厂商： | SIEMENS AG |
| 元件分类： | 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） |
| 文件页数： | 16/45页 |
| 文件大小： | 654K |
| 代理商： | C166 |
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AP242005 07.99
Crystal Oscillators of the
C500 / C166 Microcontroller Family
The described measurement procedure for R
Qmax
has to be performed for different values of R
X2
,
C
X1
and C
X2
. During the test, the values of the different elements have to be changed one after
another, and the results are noted in a table. A proposal for a protocol table is shown in table 2. For
the first test it is recommended to use C
X1
= C
X2
. A suggestion for the range is given in table 1. The
range of the elements depends on the used quartz crystal and on the characteristics of the printed
circuit board. After the test the measured values should be displayed in a diagram, see figure 7.
The measurement method of start-up and oscillation reliability for 3rd overtone mode needs more
efforts than for fundamental mode. The relation between the values of L
X
and C
X2
is given via the
formulas in chapter 5.3. When C
X
lies within the recommended range it has theoretically no effect
on the start-up behavior of the oscillator, but in a system the parasitic inductive part of C
X
can have
a little influence. C
X
is only needed in order to suppress bias voltage at XTAL2 output.
Recommended values are shown in table 1.
Table 1
Element Range for Test
Element
Range
C
X1
= C
X2
R
X2
3rd Overtone: L
X
3rd Overtone: C
X
0 - 100 pF
0 - 10 k
1 - 15μH
1 - 10nF
Table 2
Proposal for a Protocol Table
R
X2
= ... Ohm
R
Qmax
C
X1
= C
X2
0 pF
I
Q
or P
w
Comment
2.7 pF
. . .
10 pF
. . .
. . .
. . .
47 pF
M e a s u r e m e n t R e s u l t s
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| C1663-012-1 | 制造商:TINNERMAN 功能描述: |
| C1663-012-3B | 制造商:TINNERMAN 功能描述: |
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