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L1
Inductance
20uH
C4
Capacitance
0.1uF
C8
Capacitance
10pF
C9
Capacitance
10nF
SPI1_MOSI
U2
SPI1_MISO
VDD
VDD
SPI1_SCK
VDD
SPI1_CS
VDD
I2C1_SCL
R4
Resistance
470 Ω
Q1
U3
LED

[Example] STM32F4x Preliminary Design