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STM32L151VBT6A 产品设计参考手册 - ST Microelectronics(意法半导体)
制造商:
ST Microelectronics(意法半导体)
分类:
32位控制器
封装:
LQFP-100
描述:
STM32L1 系列 32 位 ARM® Cortex®-M3 微控制器,STMicroelectronics基于 ARM® Cortex™-M3 的 STM32 L1 系列采用 ST 专有超低泄漏工艺技术,具有创新自主的动态电压调节和五个 (5) 低功耗模式,提供了前所未有的平台灵活性以适用任何应用场合。 STM32 L1 系列延伸了超低功耗概念,同时不影响性能。超低功耗模式:300nA,带备份寄存器(3 个唤醒引脚) 超低功耗模式 + 实时时钟 (RTC):900nA,带备份寄存器(3 个唤醒引脚) 低功耗运行模式:低至 9μA 动态运行模式:低至 230μA/MHz
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符号图
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原理图在P10
焊接温度在P37
型号编号列表在P30
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STM32L151VBT6A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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