STM32U073RCY6 datasheet(10/146 Pages) STMICROELECTRONICS

10 / 146 page

Note:

When the functions supplied by VDDA are not used, this supply should preferably be shorted to VDD.

If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V tolerant.

VDDIOx is the I/Os general purpose digital functions supply. VDDIOx represents VDDIO1, with VDDIO1 = VDD.

Figure 2. Power supply overview

Low voltage detector

VDDA

VDDA domain

VSS

VDD

VBAT

A/D converters

D/A converters

Comparators

Operational amplifiers

Voltage reference buffer

VDD domain

I/O ring

VSSA

Reset block

Temp. sensor

PLL, MSI, HSI48,

HSI16

Standby circuitry

(Wakeup logic,

IWDG)

Voltage regulator

VDDIO1

LSE crystal 32 K osc

BKP registers

RCC BDCR register

RTC

Backup domain

Core

Memories

Digital peripherals

VCORE domain

VCORE

USB transceivers

VDDUSB

VSS

3.6.2

Power supply supervisor

The device has an integrated power-on/power-down (POR/PDR) reset active in all power modes except

Shutdown and ensuring proper operation upon power-on and power-down. It maintains the device in reset when

the supply voltage is below VPOR/PDR threshold, without the need for an external reset circuit. Brownout reset

(BOR) function allows extra flexibility. It can be enabled and configured through option bytes, by selecting one of

four thresholds for rising VDD and other four for falling VDD.

The device also features an embedded programmable voltage detector (PVD) that monitors the VDD power

supply and compares it to VPVD threshold. It allows generating an interrupt when VDD level crosses the VPVD

threshold, selectively while falling, while rising, or while falling and rising. The interrupt service routine can then

generate a warning message and/or put the MCU into a safe state. The PVD is enabled by software.

STM32U073x8/B/C

Functional overview

DS14548 - Rev 2

page 10/146

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