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參數(shù)資料
| 型號(hào)： | STM32F102C6T6XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, FLASH, 48 MHz, RISC MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 0.5 MM PITCH, ROHS COMPLIANT, LQFP-48 |
| 文件頁(yè)數(shù)： | 35/69頁(yè) |
| 文件大小： | 809K |
| 代理商： | STM32F102C6T6XXX |
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Electrical characteristics
STM32F102x4, STM32F102x6
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 4 to 16 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on characterization
results obtained with typical external components specified in Table 21. 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).
Figure 17.
Typical application with an 8 MHz crystal
1.
REXT value depends on the crystal characteristics. Typical value is in the range of 5 to 6RS.
Table 21.
HSE 4-16 MHz oscillator characteristics(1)(2)
1.
Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2.
Based on characterization results, not tested in production.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC_IN
Oscillator frequency
4
8
16
MHz
RF
Feedback resistor
200
k
Ω
CL1
CL2
(3)
3.
For CL1 and CL2 it is recommended to use high-quality 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. 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.
Recommended load capacitance
versus equivalent serial
resistance of the crystal (RS)
(4)
4.
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 Ω
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)
(5)
5.
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
ai14976
OSC_OU T
OSC_IN
fHSE
CL1
RF
STM32F102xx
8 MH z
resonator
RESONATOR WITH
IN TEGRATED CAPAC ITORS
Bias
controlled
gain
REXT(1)
CL2
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