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STM32F107VCT6TR 参数 Datasheet PDF下载

STM32F107VCT6TR图片预览
型号: STM32F107VCT6TR
PDF下载: 下载PDF文件 查看货源
内容描述: [Mainstream Connectivity line, ARM Cortex-M3 MCU with 256 Kbytes Flash, 72 MHz CPU, Ethernet MAC, CAN and USB 2.0 OTG]
分类和应用: 闪存
文件页数/大小: 103 页 / 1881 K
品牌: STMICROELECTRONICS [ ST ]
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STM32F105xx, STM32F107xx  
Electrical characteristics  
(1) (2)  
Table 22. HSE 3-25 MHz oscillator characteristics  
Symbol Parameter Conditions  
fOSC_IN Oscillator frequency  
Min  
Typ  
Max Unit  
3
25  
MHz  
RF  
Feedback resistor  
200  
30  
kΩ  
Recommended load capacitance  
versus equivalent serial  
C
RS = 30 Ω  
pF  
resistance of the crystal (RS)(3)  
VDD = 3.3 V, VIN = VSS  
with 30 pF load  
i2  
HSE driving current  
1
mA  
gm  
Oscillator transconductance  
Startup time  
Startup  
25  
mA/V  
ms  
(4)  
tSU(HSE  
VDD is stabilized  
2
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.  
2. Based on characterization, not tested in production.  
3. The relatively low value of the RF resistor offers a good protection against issues resulting from use in a  
humid environment, due to the induced leakage and the bias condition change. However, it is  
recommended to take this point into account if the MCU is used in tough humidity conditions.  
4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz  
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly  
with the crystal manufacturer  
For C and C , it is recommended to use high-quality external ceramic capacitors in the  
L1  
L2  
5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match  
the requirements of the crystal or resonator (see Figure 16). C and C are usually the  
L1  
L2  
same size. The crystal manufacturer typically specifies a load capacitance which is the  
series combination of C and C . PCB and MCU pin capacitance must be included (10 pF  
L1  
L2  
can be used as a rough estimate of the combined pin and board capacitance) when sizing  
and C . Refer to the application note AN2867 “Oscillator design guide for ST  
C
L1  
L2  
microcontrollers” available from the ST website www.st.com.  
Figure 16. Typical application with an 8 MHz crystal  
Resonator with  
integrated capacitors  
C
L1  
f
OSC_IN  
HSE  
Bias  
controlled  
gain  
8 MHz  
resonator  
R
F
STM32F10xxx  
OSC_OUT  
(1)  
R
EXT  
C
L2  
ai14128b  
1. REXT value depends on the crystal characteristics.  
Low-speed external clock generated from a crystal/ceramic resonator  
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic  
resonator oscillator. All the information given in this paragraph are based on characterization  
results obtained with typical external components specified in Table 23. In the application,  
the resonator and the load capacitors have to be placed as close as possible to the oscillator  
pins in order to minimize output distortion and startup stabilization time. Refer to the crystal  
Doc ID 15274 Rev 6  
47/104  
 
 
 
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