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: 13/45页
文件大小: 654K
代理商: C166
13 of 45
AP242005 07.99
Crystal Oscillators of the
C500 / C166 Microcontroller Family
5.3
Drive Level Calculation for 3rd Overtone Mode
The calculation of the drive level in 3rd overtone mode is equal to fundamental mode besides the
calculation of the load capacitance. The formulas below show the relations between load
capacitance, circuit components and frequencies in 3rd overtone.
Load Capacitance:
C
X2
rest Capacitance:
Resonance Frequency of C
X2
and L
X
(Thomson Formula):
Relation between f
fund
and f
3rd
:
CL
CX1 CX2rest
CX1
CX2rest
+
-------------------------------------------
CS
+
=
CX2rest
CX2
1
2
π
f3rd
(
)
2
LX
---------------------------------------
=
fLXCX2
1
2
π
LX CX2
-----------------------------------------
=
fLXCX2
-----------------------------
+
2
2 ffund
=
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