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| 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(shù)： | 23/55頁 |
| 文件大?。?/td> | 495K |
| 代理商： | C500 |
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AP242401 04.99
Ceramic Resonator Oscillators of the
C500 / C166 Microcontroller Family
7.3.2 Procedure of a Loop Gain (Safety Factor) Test in the Application
When the values for C
X1
, C
X2
, R
x2
and R
f
are already qualified then the analysis of the Safety Factor
is performed. This is done with a typical ceramic resonator and by variation of temperature and
supply voltage. For the analysis V
DD
of the system (oscillator) is periodically switched on and off as
shown in figure 4 of chapter ’Oscillator start-up Time’.
The value of R
Q
is increased until the oscillation does not start any more. From the state of no
oscillation R
Q
is then decreased until oscillation starts again. This final value of R
Q
(R
Qmax
) is used
for further calculations of the Safety Factor SF. The principle how to analyze and calculate the
safety factor is shown in ApNote 2420xx.
The calculation of the Safety Factor for a ceramic resonator requires also the equivalent circuit
constants of the device. Because of knowing the problems to get the real values for the test ceramic
resonator this ApNote offers a minimum value for R
Q
(R
Qmin
). For a rough estimation of the start-up
reliability used during evaluation it is sufficient when the measured maximum R
Q
(R
Qmax
) is at least
the value of R
Qmin
shown in the table below. If the primary way results in more different values for
the load capacitors then the configuration with the measured maximum R
Q
resistor is selected for
the application.
Note: The R
Qmin
values in table 8 are only for evaluation systems and show an order of this values.
The Safety Factor of the final board for mass production should be verified by Murata.
Table 8
Ceramic Resonator Types and recommended R
Qmin
Type
C
X1
= C
X2
[pF]
30
R
Qmin
[
]
1400
CSA4.00MG
100
1400
CSA8.00MTZ
30
800
100
500
CSA10.0MTZ
30
600
100
400
CSA20.00MXZ040
CSACV20.00MXJ040
5
300
15
300
30
300
CSA40.00MXZ040
CSACV40.00MXJ040
5
200
15
100
22
300
P
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C-500 | 制造商:MISCELLANEOUS 功能描述: 制造商:EGS ELECTRICAL GROUP 功能描述:3/8 IN 2 SCR CONNECTOR |
| C5000 | 制造商:TE Connectivity 功能描述:TRANSFORMER - Tape and Reel |
| C50-0001-031 | 制造商:Harris Corporation 功能描述: |
| C5000322-2 | 制造商:Glenair Inc 功能描述:COMPONENT PART - Bulk |
| C5000AV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
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