Solder Bridges; Table 6. Solder Bridges - ST STM32F334C8 User Manual

UM1735
5.11

Solder bridges

Bridge State
OFF
SB13, 15 (X2 crystal)
ON
SB3,5,8,10 (default) ON
SB2,4,7,9 (reserved) OFF
ON
SB20 (B2-RESET)
OFF
ON
SB21 (B1-USER)
OFF
OFF
SB14, 16
(2)
(VCP RX, TX)
ON
ON
SB18 (Vext)
OFF
ON
SB22 (L3)
OFF
ON
SB1 (ST-LINK/V2-1
PWR)
OFF
ON
SB19 (LED)
OFF
ON
SB11 (NRST)
OFF
OFF
SB17 (SWO)
ON
OFF
SB6 (STM_RST)
ON
ON
SB12 (MCO)
OFF
1. The default value is in bold.
2. The default state is OFF for boards labeled MB1142 B-01 and older.

Table 6. Solder bridges

(1)
Description
X2, C20, C21, R29 and R30 provide a clock. PF0 and PF1 are disconnected from
P1.
PF0, PF1 are connected to P1 Remove only R29 and R30
Reserved, do not modify
Reserved, do not modify
B2 Push Button is connected to NRST of STM32F334C8T6
B2 Push Button is not connected to NRST of STM32F334C8T6
B1 Push Button is connected to PA0
B1 Push Button is not connected to PA0
PA2, PA3 of STM32F103CBT6 are not connected to PB4, PB3 of
STM32F334C8T6
PA2, PA3 of STM32F103CBT6 are connected to PB4, PB3 of STM32F334C8T6,
then SW0 cannot be used and SB17 must be OFF
LED Buck is powered from 5V_OUT
LED Buck is powered from CN4
Default position.
Use CN6 for Current measurement.
ST-LINK/V2-1 module is powered
ST-LINK/V2-1 module is not powered
Default position.
Use it connecting 2 wires for Current measurement.
T_NRST signal from connector CN2 and STM32F103CBT6, is connected to
NRST of STM32F334C8T6
T_NRST signal is not connected
SWO signal is not connected
SWO signal of connector CN3 is connected to PB3, then USART_TX cannot be
used and SB16 must be OFF
No incidence on NRST signal of STM32F103CBT6
NRST signal of STM32F103CBT6 is connected to GND
MCO clock signal from STM32F103CBT6 is connected to OSC_IN of
STM32F334C8T6.
MCO signal of STM32F103CBT6 is not used.
UM1735 Rev 3
Hardware layout
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