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6.4.4.3
JP5 VDD voltage selection 1V8/3V3 power sources
The JP5 jumper selects the VDD voltage:
•
Set JP5 on [1-2] to set VDD to 3.3 V.
•
Set JP5 on [2-3] to set VDD to 1.8 V.
The consumption on this jumper includes the MCU power pins connected to the VDD_MCU power line and the
other features supplied by VDD, such as the level shifter power supply pins for STLINK-V3EC, the user button,
®
ARDUINO
shield on the IOREF pin, and power supply pins on the ST morpho connector.
6.4.5
MCU power supply
The default configuration of the MCU power pins is described in
Solder bridge
configuration
JP5[1‑2]/JP5[2‑3]
JP4[12]/ammeter
SB27 ON
SB13 ON
SB33 ON
SB25 ON
Warning:
INTERNAL V
CORE
The power figures in the Run mode are significantly improved, by generating the V
internal DC/DC converter (this function is only available on '-Q' suffixed boards).
For all general information concerning design recommendations for STM32U5 with internal SMPS and design
guide for ultra‑low‑power applications with performance, refer to the application note Getting started with
STM32U5 series MCU hardware development (AN5373) at the
6.4.6
VDD_MCU IDD measurement
The labeled IDD jumper (JP4) is used to measure the consumption of the STM32 microcontroller by removing the
jumper and by connecting an ammeter or any other current measurement tool.
•
Jumper ON: STM32 microcontroller is powered (default).
•
Jumper OFF: An ammeter or external 3.3V power source must be connected to power and measure the
STM32 microcontroller consumption.
The IDD jumper can be used to perform the current consumption for both 3.3 and 1.8 V MCU voltages.
UM3062 - Rev 1
Table 8.
VDD selection: Jumper selection for VDD 3V3 or 1V8
IDD: JP4 ON to supply the MCU or connected with an ammeter to do the current measurement.
SB for VDDSMPS input voltage
SB for VDDA input voltage
SB for VDDUSB input voltage (directly on 3V3 because VDDUSB is not compatible with 1V8
configuration)
SB for VBAT input voltage
On this Nucleo-64 board, the power
given as an example and might not follow the recommended power
to the application note Getting started with STM32U5 series MCU hardware development
(AN5373) and STM32U5xx product datasheets for power on sequencing.
SMPS power supply
Table
8.
MCU power configuration
MCU power supply
‑ on sequence implementation for the 1.8 V use case is
www.st.com
UM3062
Power supply and power selection
‑ on sequencing. Refer
logic supply from the
core
website.
page 24/45
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