Solder Bridges; Table 5. Solder Bridges - ST STM32F401 User Manual

UM1669
Oscillator from external PC14 (from external oscillator trough the pin 9 of P2 connector)
The configuration needed is:
–
–
–
4.12

Solder bridges

Bridge
SB14,16 (X2 crystal)
SB3,5,7,9 (Default)
SB2,4,6,8 (Reserved) OFF
SB17,18 (X3 crystal)
SB1 (B2-RESET)
SB21 (B1-USER)
SB13 (NRST)
SB15 (SWO)
SB10,11 (RX,TX)
SB12 (STM_RST)
SB19 (BOOT0)
SB20 (BOOT1)
SB17closed
SB18 closed
R21 and R22 removed

Table 5. Solder bridges

(1)
State
X2, C18, C19, R24 and R25 provide a clock.
OFF
PH0, PH1 are disconnected from P2
PH0, PH1 are connected to P2
ON
R24, R25 and R66 must not be fitted).
ON Reserved, do not modify
Reserved, do not modify
X3, C20, C28, R21 and R22 deliver a 32 KHz clock.
OFF
PC14, PC15 are not connected to P2.
ON PC14, PC15 are only connected to P2. Remove only R21, R22
ON B2 pushbutton is connected to the NRST pin of the STM32F401VCT6 MCU
OFF B2 pushbutton is not connected to the NRST pin of the STM32F401VCT6 MCU
ON B1 pushbutton is connected to PA0
OFF B1 pushbutton is not connected to PA0
NRST signal of the CN2 connector is connected to the NRST pin of the
ON
STM32F401VCT6 MCU
NRST signal of the CN2 connector is not connected to the NRST pin of the
OFF
STM32F401VCT6 MCU
ON SWO signal of the CN2 connector is connected to PB3
OFF SWO signal is not connected
OFF Reserved, do not modify
ON Reserved, do not modify
OFF No incidence on STM32F103C8T6 (ST-LINK/V2) NRST signal
ON STM32F103C8T6 (ST-LINK/V2) NRST signal is connected to GND
BOOT0 signal of the STM32F401VCT6 MCU is held low through a 510
ON
down resistor
BOOT0 signal of the STM32F401VCT6 MCU is held high through a 10 K
OFF
up resistor
The BOOT1 signal of the STM32F401VCT6 MCU is held high through a 10 K
OFF
pull-up resistor
The BOOT1 signal of the STM32F401VCT6 MCU is held low through a 510
ON
pull-down resistor
DocID025174 Rev 1
Description
Hardware layout
Ω
pull-
Ω
pull-
Ω
Ω
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