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參數(shù)資料
| 型號(hào)： | STM32F103RCH7XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, FLASH, 72 MHz, RISC MICROCONTROLLER, PBGA64 |
| 封裝： | ROHS COMPLIANT, LFBGA-64 |
| 文件頁(yè)數(shù)： | 67/115頁(yè) |
| 文件大?。?/td> | 1225K |
| 代理商： | STM32F103RCH7XXX |
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STM32F103xC, STM32F103xD, STM32F103xE
Electrical characteristics
55/115
Figure 20.
Typical application with a 8-MHz crystal
1.
REXT value depends on the crystal characteristics. Typical value is in the range of 5 to 6RS.
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 24. 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).
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.
ai14145
OSC_OU T
OSC_IN
fHSE
CL1
RF
STM32F103xx
8 MH z
resonator
REXT(1)
CL2
Resonator with
integrated capacitors
Bias
controlled
gain
Table 24.
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
Ω
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-TIN32.768kHz. Refer to crystal manufacturer for more details
RS = 30 kΩ
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
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