VSSA/VREF- are connected to general ground VSS in one point of the design, thanks to a solder bridge. Other
options are available.
VREF+ is the STM32U5A9NJH6Q input reference voltage for ADCs and DACs. It is connected to VDDA (default
setting). Because VDDA is 1.8 V, VREFBUF cannot be used to power VREF+.
VDD_USB is fixed at 3.3 V (supplied by TPS62140 SMPS as explained below) to enable USB Type-C
®
use.
9.4 Other peripheral power
The 1.8V power rail supplies most of the board peripherals, through a dedicated jumper. The power rail is named
VDD to differentiate with VDD_MCU, dedicated to the microcontroller.
Some components/peripherals need a 3.3 V supply: MCU, expansion connectors, MB1835 LCD board, ToF
sensor, eMMC, and LEDs. A dedicated TPS62140 SMPS provides the 3V3 power rail, to be compatible with the
current design and peripherals.
STLINK-V3E is powered by the 3V3_STLK supply (LD3985 LDO) from different 5V sources. 5.5 V is the
maximum recommended continuous input voltage, up to 6.5 V peak AMR.
UM2967
Other peripheral power
UM2967 - Rev 1
page 24/68
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