Solder Bridges; Table 6. Virtual Communication Configuration; Table 7. Solder Bridges - ST STM32 NUCLEO-F042K6 User Manual

UM1956
Bridge
SB2
SB3
1. The default configuration is reported in bold style.
6.8

Solder bridges

Bridge
SB10 (VREF+)
SB15 (LD3-LED)
SB9 (NRST)
SB11(PB2/VSS)
SB13(PB8/VSS)
SB12(PB8 /BOOT0)
SB16

Table 6. Virtual communication configuration

State
(1)
PA2 is connected to CN4 pin 5 as Arduino Nano Analog input A7 and
OFF
disconnected from ST-LINK USART.
ON PA2 is connected to ST-LINK as Virtual com TX (default).
OFF PA15 is not connected.
ON PA15 is connected to ST-LINK as Virtual com RX (default).

Table 7. Solder bridges

State
(1)
ON VREF+ on STM32 is connected to VDD.
VREF+ on STM32 is not connected to VDD and is provided by pin
OFF
13 of CN4.
ON Green user LED LD3 is connected to D13 of Arduino Nano signal.
OFF Green user LED LD3 is not connected.
The NRST signal of ST-LINK is connected to the NRST pin of the
ON
STM32.
The NRST signal of ST-LINK is not connected to the NRST pin of
OFF the STM32, when used external power (+3V3, +5V) as power
supply.
ON Pin 16 of STM32 (U2) is connected to VSS.
Pin 16 of STM32 (U2) is not connected to VSS, and used as GPIO
OFF
PB2 for STM32F031.
ON Pin 32 of STM32 (U2) is connected to VSS.
Pin 32 of STM32 (U2) is not connected to VSS, and used as GPIO
OFF
PB8 for STM32F031.
Pin 31 of STM32 (U2) is connected to GND via 10K pull-down and
ON
used as BOOT0.
Pin 16 of STM32 (U2) is not connected and is GPIO PB8 for
OFF
STM32F042.
STM32 PB6 is connected to CN4 pin 7 for I2C SDA support on
ON Arduino Nano A5. In such case STM32 PB6 does not support
Arduino Nano D5 and PA6 must configured as Input floating.
CN4 pin 7 is used as Arduino Nano analog input A5 without I2C
OFF
support and CN3 pin 8 is available as Arduino Nano D5.
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Hardware layout and configuration
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