Solder bridge Definition
State
(1)
Comment
SB2 3.3 V LDO output
ON
U6 LDO output provides
3.3 V.
OFF
U6 LDO output does not
provide 3.3 V.
SB27/SB31/
SB32/SB33
UART for VCP
SB27/SB32 ON,
SB31/SB33 OFF
USART2 from PA2/PA3
SB27/SB32 OFF,
SB31/SB33 ON
USART1 from PB6/PB7
SB30 AVDD
ON
VDD provides power to
AVDD.
OFF
VDD does not provide power
to AVDD.
SB28 AGND
ON AGND is connected to GND.
OFF
AGND is not connected to
GND.
SB5/SB6 HSE CLK selection
ON (R33/R34 OFF) PF0 and PF1work as GPIOs.
OFF
PF0 and PF1work as HSE
pins.
SB3/SB4 LSE CLK selection
ON (R31/R32 OFF)
PC14 and PC15 work as
GPIOs.
OFF
PC14 and PC15 work as LSE
pins.
SB7/SB8
SB9/SB10
ADC/I
2
C
SB8/SB9 ON
SB7/SB10 OFF
CN8 pins 5 and 6 work as
ADC.
SB8/SB9 OFF
SB7/SB10 ON
CN8 PIN5/6 works as I
2
C.
SB26 User LED
ON PA5 controls LD4.
OFF LD4 is isolated.
SB25 AVDD
ON
AVDD is connected to CN5
pin 8.
OFF
AVDD is disconnected from
CN5 pin 8.
1. Default solder bridge state is shown in bold.
UM2953
Solder bridge configuration
UM2953 - Rev 1
page 18/32
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