Solder Bridges; Table 9. Solder Bridges - ST STM32 Nucleo board User Manual

UM1724
5.9

Solder bridges

Bridge
SB54, SB55 (X3 crystal)
SB3,5,7,9 (DEFAULT)
SB4,6,8,10 (RESERVED)
SB48,49
(3)
(X2 crystal)
SB17
(B1-USER)
SB12 (NRST)
SB15 (SWO)
SB11 (STM_RST)
SB1 (USB-5V)
SB2 (3.3 V)
SB21 (LD2-LED)
SB56,SB51 (A4 and A5)
SB46,SB52
(I2C on A4 and A5)
SB45 (VBAT/VLCD)

Table 9. Solder bridges

(1)
State
X3, C33, C34, R35 and R37 provide a clock as shown in
OFF
schematics
(2)
PF0/PD0/PH0, PF1/PD1/PH1 are connected to CN12. (R35, R37 and SB50
ON
ON
OFF
X2, C31, C32, R34 and R36 deliver a 32 kHz clock. PC14, PC15 are not
OFF
ON PC14, PC15 are only connected to CN7. Remove only R34, R36
ON
OFF
The NRST signal of the CN4 connector is connected to the NRST pin of the
ON
The NRST signal of the CN4 connector is not connected to the NRST pin of the
OFF
ON The SWO signal of the CN4 connector is connected to PB3.
OFF
OFF No incidence on STM32F103CBT6 (ST-LINK MCU) NRST signal.
ON STM32F103CBT6 (ST-LINK MCU) NRST signal is connected to GND.
OFF
ON
ON Output of voltage regulator LD39050PU33R is connected to 3.3V.
OFF Output of voltage regulator LD39050PU33R is not connected.
ON Green user LED LD2 is connected to D13 of Arduino signal.
OFF
PC1 and PC0 (ADC in) are connected to A4 and A5 (pin 5 and pin 6) on
ON Arduino connector CN8 and ST Morpho connector CN7. Thus SB46 and SB52
PC1 and PC0 (ADC in) are disconnected to A4 and A5 (pin 5 and pin 6) on
OFF
PB9 and PB8 (I2C) are disconnected to A4 and A5 (pin 5 and pin 6) on Arduino
OFF
PB9 and PB8 (I2C) are connected to A4 and A5 (pin 5 and pin 6) on Arduino
ON connector CN8 and ST Morpho connector CN7 as I2C signals. Thus SB56 and
ON
OFF
DocID025833 Rev 4
Description
PF0/PD0/PH0, PF1/PD1/PH1 are disconnected from CN7.
must not be fitted).
Reserved, do not modify.
Reserved, do not modify.
connected to CN7.
B1 push button is connected to PC13.
B1 push button is not connected to PC13.
STM32 MCU.
STM MCU.
The SWO signal is not connected.
USB power management is functional.
USB power management is disabled.
Green user LED LD2 is not connected.
should be OFF.
Arduino connector CN8 and ST Morpho connector CN7.
connector CN8 and ST Morpho connector CN7.
SB51 should be OFF.
VBAT or VLCD on STM32 MCU is connected to VDD.
VBAT or VLCD on STM32 MCU is not connected to VDD.
Hardware layout and configuration
Chapter 7: Electrical
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