Hardware layout and configuration UM1724
26/55 DocID025833 Rev 4
All the other solder bridges present on the STM32 Nucleo board are used to configure
several IOs and power supply pins for compatibility of features and pinout with STM32 MCU
supported.
All STM32 Nucleo boards are delivered with the solder-bridges configured according to the
target MCU supported.
SB57 (VREF+)
ON VREF+ on STM32 MCU is connected to VDD.
OFF
VREF+ on STM32 MCU is not connected to VDD and can be provided from pin
7 of CN10
SB62, SB63 (USART)
ON
PA2 and PA3 on STM32 MCU are connected to D1 and D0 (pin 7 and pin 8) on
Arduino connector CN9 and ST Morpho connector CN10 as USART signals.
Thus SB13 and SB14 should be OFF.
OFF
PA2 and PA3 on STM32 MCU are disconnected to D1 and D0 (pin 7 and pin 8)
on Arduino connector CN9 and ST Morpho connector CN10.
SB13, SB14
(ST-LINK-USART)
OFF
PA2 and PA3 on STM32F103CBT6 (ST-LINK MCU) are disconnected to PA3
and PA2 on STM32 MCU.
ON
PA2 and PA3 on STM32F103CBT6 (ST-LINK MCU) are connected to PA3 and
PA2 on STM32 MCU to have USART communication between them. Thus
SB61,SB62 and SB63 should be OFF.
SB16,SB50(MCO)
(2)
OFF
MCO on STM32F103CBT6 (ST-LINK MCU) are disconnected to PF0/PD0/PH0
on STM32 MCU.
ON
MCO on STM32F103CBT6 (ST-LINK MCU) are connected to PF0/PD0/PH0 on
STM32 MCU.
1. The default SBx state is shown in bold.
2. Default configuration depends on board version. Please refer to chapter 5.7.1 for details
3. Default configuration depends on board version. Please refer to chapter 5.7.2 for details.
Table 9. Solder bridges (continued)
Bridge State
(1)
Description
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