• V
BAT
= 1.55 V to 3.6 V
V
BAT
is the power supply when V
DD
is not present (through power switch) for RTC, TAMP, external clock
32 kHz oscillator, backup registers, and optionally backup SRAM.
• V
REF-
, V
REF+
V
REF+
is the input reference voltage for ADCs and DACs. It is also the output of the internal voltage
reference buffer (VREFBUF) when enabled. The VREF+ pin can be grounded when ADC and DAC are not
active.
The internal voltage reference buffer supports four output voltages that are configured with the VRS[2:0]
field in VREFBUF_CSR register:
– V
REF+
around 1.5 V. This requires V
DDA
≥ 1.8 V.
– V
REF+
around 1.8 V. This requires V
DDA
≥ 2.1 V.
– V
REF+
around 2.048 V. This requires V
DDA
≥ 2.4 V.
– V
REF+
around 2.5 V. This requires V
DDA
≥ 2.8 V.
VREF- and VREF+ pins are not available on all packages. When not available, they are bonded to VSSA
and VDDA pins, respectively.
When the VREF+ pin is double-bonded to VDDA in a package, the internal VREFBUF is not available, and
must be kept disabled.
V
REF-
must always be equal to V
SSA
.
• V
DDDSI
= 1.71 V to 3.6 V (only available on STM32U59x/5Ax/5Fx/5Gx devices)
V
DDDSI
is the external power supply for the DSI controller. It is provided externally through the VDDDSI
supply pin, and must be connected to the same supply as VDD pin.
• V
DD11DSI
= 1.0 V to 1.26 V (only available on STM32U59x/5Ax/5Fx/5Gx devices)
V
DD11DSI
is the external power supply for the DSI transceiver and must be connected to VDD11.
The following figures present an overview of the STM32U5 devices power supply, depending on the SMPS
presence.
AN5373
Power supplies
AN5373 - Rev 6
page 4/47
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