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STMicroelectronics Discovery kit for STM32L100 Value line - with STM32L100RC MCU STM32L100C-DISCO STM32L100C-DISCO Fiche De Données

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STM32L100C-DISCO
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Hardware and layout
UM1656
DocID025091 Rev 1
4.8 Solder 
bridges
         
Table 4. Solder bridge settings
Bridge State
(1)
 Description 
SB16,17
(X2 crystal)
(2)
OFF 
X2, C13, C14, R22 and R23 provide a clock. PH0, PH1 are disconnected 
from P1. 
ON 
PH0, PH1 are connected to P1 (R22, R23 and SB18 must not be fitted). 
SB6,8,10,12 (Default) 
ON 
Reserved, do not modify. 
SB5,7,9,11 (Reserved) 
OFF 
Reserved, do not modify. 
SB20,21
(X3 crystal)
OFF 
X3, C15, C16, R24 and R25 deliver a 32 KHz clock. PC14, PC15 are not 
connected to P1.
ON 
PC14, PC15 are only connected to P1 (R24, R25 must not be fitted).
SB4
(B2-RESET) 
ON 
B2 push button is connected to the NRST pin of the STM32L100RCT6 
MCU. 
OFF 
B2 push button is not connected the NRST pin of the STM32L100RCT6 
MCU. 
SB3
(B1-USER) 
ON 
B1 push button is connected to PA0. 
OFF 
B1 push button is not connected to PA0. 
SB1
(VBAT powered from VDD) 
ON 
VBAT is permanently powered from VDD.
OFF 
VBAT is not powered from VDD but pin3 of P1.
SB14,15
(RX,TX) 
OFF 
Reserved, do not modify. 
ON 
Reserved, do not modify. 
SB19
(NRST) 
ON 
NRST signal of the CN3 connector is connected to the NRST pin of the 
STM32L100RCT6 MCU. 
OFF 
NRST signal of the CN3 connector is not connected to the NRST pin of the 
STM32L100RCT6 MCU. 
SB22
(T_SWO) 
ON 
SWO signal of the CN3 connector is connected to PB3. 
OFF 
SWO signal is not connected. 
SB13
(STM_RST) 
OFF 
No incidence on STM32F103C8T6 (ST-LINK/V2) NRST signal. 
ON STM32F103C8T6 
(ST-LINK/V2) 
NRST signal is connected to GND. 
SB2
(BOOT0) 
ON 
BOOT0 signal of the STM32L100RCT6 MCU is held low through a 
510 Ohm pull-down resistor. 
OFF 
BOOT0 signal of the STM32L100RCT6 MCU can be set high through a 
10 K
Ω pull-up resistor R27 to solder.
SB18
(MCO)
ON 
Provides the 8 MHz for OSC_IN from MCO of STM32L100RCT6.
OFF 
See SB16, SB17 description.
1.
Default SBx state is shown in bold.
2.
OSC_IN clock comes from MCO if SB18 is ON and SB16,17 are OFF
and comes from X2 if SB18 is OFF and SB16,17 are ON.