We are building a test card for a host that embeds the STM32L552 microcontroller in it. The data lines are broken out and VDDUSB is tied to the same voltage as the VDD for the MCU. Do we need to use VBUS in this case? Please advise.
Specifically, when T_VCC is not supplied, what state are the pins in for the STLINK-V3SET? We are using the SWDIO, SWCLK, and JTAG pins on the STDC14 connector CN1.
