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参数资料
| 型号： | STM32F100CBT7BTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 24 MHz, RISC MICROCONTROLLER, PQFP48 |
| 封装： | 7 X 7 MM, ROHS COMPLIANT, LQFP-48 |
| 文件页数： | 44/86页 |
| 文件大小： | 1198K |
| 代理商： | STM32F100CBT7BTR |
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STM32F100x4, STM32F100x6, STM32F100x8, STM32F100xB
Electrical characteristics
Doc ID 16455 Rev 3
Note:
For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5 pF to
15 pF range 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.
Load capacitance CL has the following formula: CL = CL1 x CL2 / (CL1 + CL2) + Cstray where
Cstray is the pin capacitance and board or trace PCB-related capacitance. Typically, it is
between 2 pF and 7 pF.
Caution:
To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended
to use a resonator with a load capacitance CL 7 pF. Never use a resonator with a load
capacitance of 12.5 pF.
Example: if you choose a resonator with a load capacitance of CL = 6 pF, and Cstray = 2 pF,
then CL1 = CL2 = 8 pF.
Figure 21.
Typical application with a 32.768 kHz crystal
Table 22.
LSE oscillator characteristics (fLSE = 32.768 kHz)
(1)
1.
Based on characterization, not tested in production.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RF
Feedback resistor
5
M
CL1
CL2
(2)
2.
Refer to the note and caution paragraphs above the table.
Recommended load capacitance
versus equivalent serial
resistance of the crystal (RS)
(3)
3.
The oscillator selection can be optimized in terms of supply current using an high quality resonator with
small RS value for example MSIV-TIN32.768 kHz. Refer to crystal manufacturer for more details
RS = 30 K
15
pF
I2
LSE driving current
VDD = 3.3 V
VIN = VSS
1.4
A
gm
Oscillator transconductance
5
A/V
tSU(LSE)
(4)
4.
tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized
32.768 kHz 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
3
s
ai14129b
OSC32_OU T
OSC32_IN
fLSE
CL1
RF
STM32F10xxx
32.768 KH z
resonator
Resonator with
integrated capacitors
Bias
controlled
gain
CL2
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