參數(shù)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(shù): 28/55頁
文件大?。?/td> 495K
代理商: C500
28 of 55
AP242401 04.99
Ceramic Resonator Oscillators of the
C500 / C166 Microcontroller Family
10
Recommendations of the Ceramic Resonator Manufacturer Murata
The preceding chapters have shown the principle of how to find the appropriate values for the circuit
components of a ceramic resonator oscillator circuitry which ensure a problem-free operation.
Similar tests were done in a cooperation between
Infineon Technologies
(MD AE) and
Murata
.
Results are available for different Infineon Technologies microcontrollers. The specialists from
Murata have done the analyses with the aid of the microcontroller development group of Infineon
Technologies. The results of this cooperation are presented in the appendix of this Application Note.
The cooperation will be continued and further results will be added to this Application Note step by
step.
Because of knowing the effort necessary to find the right composition of external circuit and the right
type of ceramic resonator, Murata offers the service to check the original PCB of the customer and
gives a recommendation for the right type of resonator and appropriate external circuits.
Note: The appendix shows recommendations for the appropriate circuit composition of the
oscillator which run in most of all applications but it is recommended to use the service of
Murata because every design can have specific influences on the oscillator (noise, layout
etc.).
11
General Information using the Appendix
The Appendix includes general recommendations for the right composition of external circuits for
the C500 Family and the C166 Family. Each recommendation for the external circuits is only
one
of
more different possibilities. The decision which composition is the right one, is not ’digital’ (go or no
go) but has to be done in an ’analog’ way which offers more different results which fits to the system.
Depending on the system demands different criteria have to be considered: safety factor (loop
gain), start-up behavior, ceramic resonator specification, frequency, EMC, layout demands etc.
These facts are the base for the trade-off which external circuits fit best to the individual application
system.
The general recommendations in the appendix are based on a safety margin concerning the loading
capacitance variation of +/- 50% or more. This is necessary because the appendix includes general
recommendations and not recommendations fitting to a specific application.
Recommendations for a specific application can only be obtained from an analysis of the respective
system (support offered by Murata).
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