ST STM32L5 Nucleo-144 board User Manual page 31

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