參數(shù)資料
型號(hào)： STM32F103R8T7TR
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 1.25 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, ROHS COMPLIANT, QFP-64
文件頁數(shù)： 46/92頁
文件大?。?/td> 1212K
代理商： STM32F103R8T7TR
Electrical characteristics
STM32F103x8, STM32F103xB
Doc ID 13587 Rev 11
For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the
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 22). CL1 and CL2 are usually the
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of CL1 and CL2. PCB and MCU pin capacitance must be included (10 pF
can be used as a rough estimate of the combined pin and board capacitance) when sizing
CL1 and CL2. Refer to the application note AN2867 “Oscillator design guide for ST
microcontrollers” available from the ST website www.st.com.
Figure 22.
Typical application with an 8 MHz crystal
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
resonator manufacturer for more details on the resonator characteristics (frequency,
package, accuracy).
Table 22.
HSE 4-16 MHz oscillator characteristics(1) (2)
1.
Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2.
Based on characterization, not tested in production.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC_IN
Oscillator frequency
4
8
16
MHz
RF
Feedback resistor
200
k
C
Recommended load capacitance
versus equivalent serial
resistance of the crystal (RS)
(3)
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.
RS = 30
30
pF
i2
HSE driving current
VDD = 3.3 V, VIN =VSS
with 30 pF load
1mA
gm
Oscillator transconductance
Startup
25
mA/V
tSU(HSE
(4)
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
startup time
VDD is stabilized
2
ms
ai14145
OSC_OU T
OSC_IN
fHSE
CL1
RF
STM32F103xx
8 MH z
resonator
REXT(1)
CL2
Resonator with
integrated capacitors
Bias
controlled
gain
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STM32F103R8T7XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
STM32F103R8U6TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
STM32F103R8U6XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
STM32F103R8U7TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
STM32F103R8U7XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces
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