Datasheet 搜索 > 微控制器 > ST Microelectronics（意法半导体） > STM32L151VCT6ATR 数据手册 > STM32L151VCT6ATR 产品设计参考手册 6/43 页
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STM32L151VCT6ATR 产品设计参考手册 - ST Microelectronics（意法半导体）
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ST Microelectronics（意法半导体）
分类:
微控制器
封装:
LQFP-100
描述:
STM32 系列 32 位 32 MHz 32 KB Ram 256 kB 闪存 微控制器 - LQFP-100
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STM32L151VCT6ATR数据手册
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Quartz crystal properties and model AN2867
6/43 DocID15287 Rev 11
1 Quartz crystal properties and model
A quartz crystal is a piezoelectric device transforming electric energy into mechanical
energy and vice versa. The transformation occurs at the resonant frequency. The quartz
crystal can be modeled as shown in Figure 1.
Figure 1. Quartz crystal model
• C
0
: represents the shunt capacitance resulting from the capacitor formed by the
electrodes
• L
m
: (motional inductance) represents the vibrating mass of the crystal
• C
m
: (motional capacitance) represents the elasticity of the crystal
• R
m
: (motional resistance) represents the circuit losses
The impedance of the crystal is given by the following equation (assuming that R
m
is
negligible):
(1)
Z
j
w
----
w
2
L
m
× C
m
× 1–
C
0
C
m
+()w
2
L
m
× C
m
× C
0
×–
------------------------------------------------------------------------------------------
×=
Figure 2 represents the impedance in the frequency domain.
Figure 2. Impedance representation in the frequency domain
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