ST MB1361, User Manual, Page: 31 / 48

Definition Bridge
Setting
(1)(2) Comment
USB
SB135
OFF
PB5 not connected to Zio CN7 for SPI_B interface: Reserved for
UCPD_DBn
ON
PB5 connected to Zio CN7 for SPI_B interface, can’t be used
for UCPB_DBn
AGND SB9 ON AGND connected to GND. Reserved, do not modify.
SWD interface
(Reserved)
SB100/SB102/
SB104/SN106
OFF Reserved, do not modify
SWD interface
(Default)
SB101/SB103/
SB105/SB107
ON Reserved, do not modify
SWO
SB108
OFF
SWO connected through level shifter to target MCU I/O 1V8
compatibility
ON
SWO not connected through the level shifter. Debug mode only
compatible with MCU I/O 3V3
SB140
OFF PB3 used as I/O on Zio and morpho connector
ON
PB3, used as SWO_MCU, connected between STLINK and
target MCU
Level shifter
SB109
OFF Level shifter not connected to VDD_MCU
ON
Level shifter connected to VDD_MCU (SB110 must be
disconnected)
SB110
OFF Level shifter not connected to 3V3_PER
ON
Level shifter connected to 3V3_PER (SB109 must be
disconnected)
IOREF selection
SB111
OFF IOREF NOT connected to 3V3_PER power supply
ON IOREF connected to 3V3_PER power supply
SB112
OFF IOREF NOT connected to VDD_MCU power supply
ON IOREF connected to VDD_MCU power supply
SB113
OFF IOREF NOT connected to 3V3 power supply
ON IOREF connected to 3V3 power supply
SMPS 1V8 power input SB114
ON SMPS 1V8 U7/U101 powered by 5V
OFF SMPS 1V8 U7/U101 NOT powered
User LED GREEN
SB118
OFF Green user LED green not driven by PC7
ON Green user LED driven by PC7
SB120
OFF Green user LED not driven by PA5
ON Green user LED driven by PA5 with ARD_D13
SDMMC I/O
SB119
OFF
PC8 not connected to morpho CN12 pin 2 to avoid stub on Zio
CN8 SDMMC_D0
ON PC8 connected to morpho CN12 pin 2 and Zio CN8 pin 2
SB122
OFF
PC9 not connected to morpho CN12 pin 1 to avoid stub on Zio
CN8 SDMMC_D1
ON PC9 connected to morpho CN12 pin 1 and Zio CN8 pin 4
Zio SAI_D / SPI_B
interface
SB121
OFF PA4 not connected to Zio CN7 for SAI_D interface
ON PA4 connected to Zio CN7 for SAI_D interface
SB136
OFF PA4 not connected to Zio CN7 for SPI_B interface
ON PA4 connected to Zio CN7 for SPI_B interface
SB134
OFF PB4 not connected to Zio CN7 for SAI_D interface
UM2581
Solder bridge configuration
UM2581 - Rev 2
page 31/48