STM32U545NET3QTR datasheet(33/283 Pages) STMICROELECTRONICS

33 / 283 page

DS14216 Rev 1

33/283

STM32U545xx

Functional overview

–VREF+ around 2.048 V. This requires VDDA ≥ 2.4 V.

–VREF+ around 2.5 V. This requires VDDA ≥ 2.8 V.

VREF- and VREF+ pins are not available on all packages. When not available, they are

bonded to VSSA and VDDA, respectively.

When the VREF+ is double-bonded with VDDA in a package, the internal voltage

reference buffer is not available and must be kept disabled.

VREF- must always be equal to VSSA.

The STM32U545xx devices embed two regulators: one LDO and one SMPS in parallel to

provide the VCORE supply for digital peripherals, SRAM1, SRAM2, and SRAM4 and

embedded flash memory. The SMPS generates this voltage on VDD11 (two pins), with

a total external capacitor of 4.7 μF typical. SMPS requires an external coil of 2.2 μH typical.

The LDO generates this voltage on VCAP pin connected to an external capacitor of 4.7 μF

typical.

Both regulators can provide four different voltages (voltage scaling) and can operate in

Stop modes.

It is possible to switch from SMPS to LDO and from LDO to SMPS on-the-fly.

Figure 2. STM32U545xxxxQ power supply overview (with SMPS)

MSv70511V2

USB transceiver

Core

SRAM1

SRAM2

SRAM4

Digital

peripherals

LSE crystal 32 kHz oscillator

LSI 32 kHz oscillator

Backup registers

RCC_BDCR and PWR_BDCR1 registers

RTC

TAMP

BKPSRAM

VDDA domain

Backup domain

Standby circuitry

(Wakeup logic, IWDG)

LDO regulator

Low-voltage detector

I/O ring

VCORE domain

Flash memory

VDDUSB

VDDIO2

VDDIO1

I/O ring

PG[15:2]

VDDIO2

VDDA

VSSA

VSS

VDDIO2 domain

VDD domain

VCORE

VSS

VDD

VBAT

2x VDD11

SMPS regulator

Voltage regulator

VLXSMPS

VDDSMPS

VSSSMPS

A/D converters

Comparators

D/A converters

Operational amplifiers

Voltage reference buffer

Temperature sensor

Reset block

3 x PLL

Internal RC oscillators

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