2Board component description and configuration
2.1 Connectors
The X-NUCLEO-USBPDM1 expansion board is equipped with USB Type-C™ connector (CN1).
VBUS can supply:
• the power connector (CN2) in normal mode
• STM32 when LDO (U2) output is connected to 3.3 V pin
2.2 Jumpers
To select the STM32 Nucleo development board to be used with the X-NUCLEO-USBPDM1 expansion board,
use JP1 jumper (UCPD peripheral selection) and CC lines (CC1 and CC2) connection:
•For the NUCLEO-G071RB development board, use STM32 UCPD transceiver CC lines connection to ST
morpho connector (CN10–23 and CN10–26).
• For the NUCLEO-G474RE development board, use STM32 UCPD transceiver CC lines connection to ST
morpho connector (CN10–17 and CN10–27).
Other connections among the two boards are configured by JP2 jumpers.
The global jumper setup is the following:
•LDO OUT – 3.3 V to connect the LDO output to 3.3 V on the X-NUCLEO-USBPDM1. The STM32 is
powered by the USB Type-C connector.
Note: In this mode, the only way to program the STM32 Nucleo development board is to power the ST-LINK and
disconnect the LDO output.
•3.3 V is common between X-NUCLEO-USBPDM1 and STM32 Nucleo development boards.
•3.3 V – NRST to force the STM32 I/O negative reset to level ‘1’. It must be connected when the STM32 is
powered by the X-NUCLEO-USBPDM1 and when the STM32 Nucleo development board ST-LINK is
connected. When programming or when ST-LINK is physically disconnected from the STM32 Nucleo
development board, 3.3 V – NRST must be disconnected.
•FLT – FLT_IN to connect the TCPP01-M12 fault report (open drain) to a pull-up output and to the ST
morpho connector (CN10 – 18, PC0 of NUCLEO-G071RB and PB11 of NUCLEO-G474RE).
The TCPP01-M12 supply options are:
•VCC – 3.3V to supply the TCPP01-M12 VCC with 3.3 V.
•VCC – VCC_OUT to supply the TCPP01-M12 VCC via a GPIO on ST morpho connector (CN7 – 1, PC10 of
NUCLEO-G071RB and NUCLEO-G474RE). This case is useful with battery powered devices as the
TCPP01-M12 can be powered only when an attachment is detected (low power mode).
• Integrated dead battery management for fully depleted battery devices.
Dead battery management options are:
•DB – 3.3 V to remove the TCPP01-M12 dead battery clamp when 3.3 V is present.
•DB – DB_OUT to remove the TCPP01-M12 dead battery clamp when GPIO is connected on ST morpho
connector CN10 – 24. In this case, the STM32 MCU manages dead battery clamp removal.
2.3 LEDs
Two LEDs are mounted on the X-NUCLEO-USBPDM1 expansion board top side:
•A red LED to indicate the USB Type-C VBUS voltage is present (voltage on CN2 and LDO powered).
• A green LED to indicate that 3.3 V is present and can be supplied by the STM32 Nucleo development board
or by the X-NUCLEO-USBPDM1 LDO.
2.4 VBUS overvoltage protection setup
On the X-NUCLEO-USBPDM1 expansion board bottom side, a zero Ohm resistor (R0) selects a 22 V OVP
threshold.
UM2668
Board component description and configuration
UM2668 - Rev 2 page 4/19
