STM32U545NET3QTR datasheet(32/283 Pages) STMICROELECTRONICS

32 / 283 page

Functional overview

STM32U545xx

32/283

DS14216 Rev 1

•

Power management

–

Operating modes

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Voltage scaling control

–

Low-power modes

•

VBAT battery charging

•

TrustZone security and privileged protection

3.9.1

Power supply schemes

The devices require a 1.71 V to 3.6 V VDD operating voltage supply. Several independent

supplies can be provided for specific peripherals:

•

VDD = 1.71 V to 3.6 V (functionality guaranteed down to VBORx min value)

VDD is the external power supply for the I/Os, the internal regulator and the system

analog such as reset, power management and internal clocks. It is provided externally

through the VDD pins.

•

VDDA = 1.58 V (COMPs) / 1.6 V (DACs, OPAMPs) / 1.62 V (ADCs) /

1.8 V (VREFBUF) to 3.6 V

VDDA is the external analog power supply for ADCs, DACs, voltage reference buffer,

operational amplifiers and comparators. The VDDA voltage level is independent from

the VDD voltage and must be connected to VDD or VSS pin (preferably to VDD) when

these peripherals are not used.

•

VDDSMPS = 1.71 V to 3.6 V

VDDSMPS is the external power supply for the SMPS step down converter. It is provided

externally through VDDSMPS supply pin and must be connected to the same supply

than VDD.

•

VLXSMPS is the switched SMPS step down converter output.

Note:

The SMPS power supply pins are available only on a specific package with SMPS step

down converter option.

•

VDDUSB = 3.0 V to 3.6 V

VDDUSB is the external independent power supply for USB transceivers. VDDUSB

voltage level is independent from the VDD voltage and must be connected to VDD or

VSS pin (preferably to VDD) when the USB is not used.

•

VDDIO2 = 1.08 V to 3.6 V

VDDIO2 is the external power supply for 14 I/Os (port G[15:2]). The VDDIO2 voltage level

is independent from the VDD voltage and must be connected to VDD or VSS pin

(preferably to VDD) when PG[15:2] are not used.

•

VBAT = 1.65 V to 3.6 V (functionality guaranteed down to VBOR_VBAT min value)

VBAT is the power supply for RTC, TAMP, external and internal clocks 32 kHz

oscillators and backup registers (through power switch) when VDD is not present.

•

VREF-, VREF+

VREF+ is the input reference voltage for ADCs and DACs. It is also the output of the

internal voltage reference buffer when enabled.

VREF+ can be grounded when ADC and DAC are not active.

The internal voltage reference buffer supports four outputs:

–VREF+ around 1.5 V. This requires VDDA ≥ 1.8 V.

–VREF+ around 1.8 V. This requires VDDA ≥ 2.1 V.

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