ST STM32U575I-EV, User Manual, Page: 32 / 105

1V8
Regardless of the 5 V power source, the U31 LDO is used to deliver a fixed 1.8 V voltage, with a current
capability of 150 mA. This voltage source is mainly reserved for the low-power audio codec. This one is not
targeted to supply the MCU. To drive the MCU in low voltage, use the VDD_ADJ supply voltage.
Table 15 details the LDO and associated hardware solder bridge configuration.
Table 15. LDO and associated hardware solder bridge configuration
I/O
Solder
bridge
Definition Setting
(1)
Comment
3V3 SB4 LDO output for 3V3
ON U19 able to provide the main 3V3
OFF U19 output disconnected
VDD_ADJ SB3
LDO output for
VDD_ADJ
ON U18 able to provide the main VDD_ADJ: 1V7 to 3V6
OFF U18 output disconnected
2V8 SB104
LDO output for camera
daughterboard
ON U10 able to provide 2.8 V for camera daughterboard
OFF U10 output disconnected, no 2.8 V for camera daughterboard
1V8 SB7
LDO output for audio
codec
ON U31 able to provide audio 1.8 V
OFF U31 output disconnected, no internal audio 1.8 V source
1. The default configuration is in bold.
7.8.10 VDD_MCU IDD measurement
The labeled IDD JP19 jumper can measure the consumption of the STM32 microcontroller replacing the jumper
by an ammeter or a current measurement tool.
•
Jumper ON: STM32 Microcontroller is powered (default).
• Jumper OFF: an ammeter or an external 3V3 power source must be connected to power and measure the
STM32 microcontroller consumption.
The IDD jumper can perform the current measurement for both 3V3 and 1V8 MCU voltage ranges.
For specific consumption measurement by external tools like STM32 CubeMonitor Power (STM32CubeMonPwr)
or ULPBench probe, where only VDD_MCU is externally powered, (meaning No STLINK, no 5V, no VDD, only
JP19 pin 2 powered by 3V3 or 1V8), it is recommended to configure the STM32U575I-EV Evaluation board to
avoid leakage currents from I/Os connected to unpowered components. This configuration can be used to assure
there is no return consumption from other power sources such as VDD_MCU.
For the software configuration, all I/Os must be set correctly according to the Cube power consumption example.
From the hardware point of view, it is recommended to disconnect the signal RSTN from the unpowered
components.
To measure STM32U575AII6Q consumption with this test bench configuration, the board configuration must be:
•
Removed memory module MB1242 to avoid an average leakage consumption of around 750 µA.
• Removed R211 0 ohm resistor on NRST signal on U47 embedded Octo
‑
SPI Flash memory to avoid an
average leakage consumption of around 180 µA.
• Removed LCD and camera modules to avoid an average leakage consumption of around 2 µA.
• Finally removed D3 on U15 MFX_NRST signal and R69 on U26 STLINK MCU to avoid a leakage
consumption around 0.7 µA.
STM32U575I-EV
Power supply
UM2854 - Rev 1
page 32/105