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MM32F103CET Datasheet(PDF) 54 Page - MindMotion Microelectronics

Part # MM32F103CET
Description  32-bit Micro controller based on ARM Cortex M3
PDF  89 Pages
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Manufacturer  MINDMOTION [MindMotion Microelectronics]
Direct Link  https://www.mindmotion.com.cn/
Logo MINDMOTION - MindMotion Microelectronics

MM32F103CET Datasheet(HTML) 54 Page - MindMotion Microelectronics

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DS_MM32F103xx_o_Ver1.13
Electrical characteristics
the maximum value of CL1 and CL2 (15pF) , it is highly recommended to use a resonator
with a load capacitance of CL ≤ 7pF. A resonator with a load capacitance of 12.5pF cannot
be used. For example, if a resonator with a load capacitance of CL = 6pF is selected and
Cstray = 2pF, then CL1 = CL2 = 8pF.
Table 21. LSI oscillator characteristics (fLSE=32.768KHz)
(
1)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RF
Feedback resistor
25
MΩ
CL1
CL2
(
2)
The proposed load
capacitance corresponds to
the crystal serial impedance
(RS)
(
3)
RS = 30Ω
4
pF
I2
LSE current consumption
VDD = 3.3V
VIN= VSS
0.08
μA
gm
Oscillator transconductance
0.5
μA/V
tSU(HSE)
(
4)
Startup time
VDD is stabilized
1
4
S
1. Guaranteed by design, not tested in production.
2. See the note and warning paragraphs above this table.
3. Selecting a high quality oscillator with a small RS value (such as MSIV-TIN 32.768KHz)
optimizes current consumption. Please consult the crystal manufacturer for details.
4. tSU(HSE) is the start-up time, which is measured from the time the software enables
HSE until a stable 8MHz oscillation is obtained. This value is measured on a standard
crystal resonator, which may vary greatly depending on the crystal manufacturer.
112577
CL2
CL1
32.768KHz
OSC32_IN
OSC32_OUT
fLSE
RF
Figure 17. Typical application with a 32.768 kHz crystal
5.3.7
Internal clock source characteristics
The characteristic parameters given in the table below are measured using ambient tem-
perature and supply voltage in accordance with general operating conditions.
High-speed internal (HSI) oscillator
www.mm32mcu.com
48/83



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