Solder Bridges; Table 7. Solder Bridges - ST STM32F072 User Manual

UM1690
5.13

Solder bridges

Bridge
SB17,18 (X3 crystal)
SB13,14 (X2 crystal)
SB19 (MCO)
SB2,4,7,9 (Default)
SB1,3,6,8 (Reserved) OFF
SB24,25 (GND,VDD)
SB11,12 (RX,TX)
SB27,28,29,30,31,32
(touch sensor)
SB20,23 (USB-
USER)
SB21 (B1-USER)
SB22 (B2-RESET)
SB10 (NRST)
SB5 (STM_RST)
SB15 (VBAT)
SB16 (VDDIO2)
SB26 (VDDA)
1. The default state is in bold.

Table 7. Solder bridges

(1)
State
PF0, PF1 are connected to P1 (R36, R37 must not be fitted and SB19 must be
ON
OFF).
X3, C22, C23, R36 and R37 provide a clock. PF0, PF1 are disconnected from
OFF
P1.
ON PC14, PC15 are only connected to P1. Remove only R34, R35
X2, C19, C20, R34 and R35 deliver a 32 KHz clock. PC14, PC15 are not
OFF
connected to P1.
OFF MCO signal of STM32F103C8T6 is not used.
MCO clock signal from STM32F103C8T6 is connected to OSC_IN of
ON
STM32F072RBT6. (SB17 must be OFF).
ON Reserved, do not modify.
Reserved, do not modify.
ON Reserved, do not modify.
OFF Reserved, do not modify
OFF Reserved to the linear touch sensor. PA2,3,6,7 and PB0,1 are not available.
PA2,3,6,7 and PB0,1 are available then remove R38,39,40 and C26,27,28. (the
ON
linear touch sensor is not available)
OFF Reserved to the USB USER CN2. PA11,12 are not available.
ON PA11,12 are available then remove R12,13. (the USB USER CN2)
ON B1 pushbutton is connected to PA0.
OFF B1 pushbutton is not connected to PA0.
ON B2 pushbutton is connected to the NRST pin of the STM32F072RBT6 MCU.
OFF B2 pushbutton is not connected the NRST pin of the STM32F072RBT6 MCU.
T_NRST pin of the STM32F103C8T6 (ST-LINK/V2) and CN4.5 are connected to
ON
the NRST pin of the STM32F072RBT6 MCU.
T_NRST pin of the STM32F103C8T6 (ST-LINK/V2) and CN4.5 are not
OFF
connected to the NRST pin of the STM32F072RBT6 MCU.
OFF No incidence on STM32F103C8T6 (ST-LINK/V2) NRST signal.
ON STM32F103C8T6 (ST-LINK/V2) NRST signal is connected to GND.
ON VBAT Power is supplied by VDD
OFF VBAT Power is supplied by P1.3 connector
ON VDDIO2 Power is supplied by VDD
OFF VDDIO2 Power is supplied by P2.18 connector
ON VDDA Power is supplied by VDD through L1 inductance.
OFF VDDA Power is supplied by P2.19 connector
Description
UM1690 Rev 3
Hardware layout
19/27
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