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STM32F405RG 参数 Datasheet PDF下载

STM32F405RG图片预览
型号: STM32F405RG
PDF下载: 下载PDF文件 查看货源
内容描述: ARM的Cortex- M4 32B MCUFPU , 210DMIPS ,高达1MB闪存/ 1924KB RAM , USB OTG HS / FS [ARM Cortex-M4 32b MCUFPU, 210DMIPS, up to 1MB Flash/1924KB RAM, USB OTG HS/FS]
分类和应用: 闪存
文件页数/大小: 185 页 / 5432 K
品牌: STMICROELECTRONICS [ ST ]
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Electrical characteristics  
Symbol  
STM32F405xx, STM32F407xx  
(1) (2)  
Table 31. HSE 4-26 MHz oscillator characteristics  
Parameter  
Conditions  
Min  
Typ  
Max Unit  
fOSC_IN Oscillator frequency  
4
-
-
26  
-
MHz  
RF  
Feedback resistor  
200  
kΩ  
VDD=3.3 V,  
ESR= 30 ,  
CL=5 pF@25 MHz  
-
-
449  
532  
-
-
IDD  
HSE current consumption  
µA  
VDD=3.3 V,  
ESR= 30 ,  
CL=10 pF@25 MHz  
gm  
Oscillator transconductance  
Startup time  
Startup  
5
-
-
-
-
mA/V  
ms  
(3)  
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. 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 32). 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 .  
C
L1  
L2  
Note:  
For information on electing the crystal, refer to the application note AN2867 “Oscillator  
design guide for ST microcontrollers” available from the ST website www.st.com.  
Figure 32. 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
STM32F  
OSC_OUT  
(1)  
R
EXT  
C
L2  
ai17530  
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 32. 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 resonator manufacturer for more details on the resonator  
characteristics (frequency, package, accuracy).  
98/185  
DocID022152 Rev 4  
 
 
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