STM32U535NET3QTR datasheet(35/278 Pages) STMICROELECTRONICS

35 / 278 page

DS14217 Rev 1

35/278

STM32U535xx

Functional overview

Figure 4. Power-up /down sequence

1. VDDX refers to any power supply among VDDA, VDDUSB, and VDDIO2.

3.9.2

Power supply supervisor

The devices have an integrated ultra-low-power BOR (Brownout reset) active in all modes

(except for Shutdown mode). The BOR ensures proper operation of the device after power

on and during power down. The device remains in reset mode when the monitored supply

voltage VDD is below a specified threshold, without the need for an external reset circuit.

The lowest BOR level is 1.71 V at power on, and other higher thresholds can be selected

through option bytes.The devices feature an embedded PVD (programmable voltage

detector) that monitors the VDD power supply and compares it to the VPVD threshold.

An interrupt can be generated when VDD drops below and/or rises above the VPVD

threshold. 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.

In addition, the devices embed a peripheral voltage monitor that compares the independent

supply voltages VDDA, VDDUSB and VDDIO2 to ensure that the peripheral is in its functional

supply range.

The devices support dynamic voltage scaling to optimize its power consumption in Run

mode. The voltage from the main regulator that supplies the logic (VCORE) can be adjusted

according to the system’s maximum operating frequency.

The main regulator operates in the following ranges:

•

Range 1 (VCORE = 1.2 V) with CPU and peripherals running at up to 160 MHz

•

Range 2 (VCORE = 1.1 V) with CPU and peripherals running at up to 110 MHz

•

Range 3 (VCORE = 1.0 V) with CPU and peripherals running at up to 55 MHz

•

Range 4 (VCORE = 0.9 V) with CPU and peripherals running at up to 25 MHz

MSv47490V1

0.3

VBOR0

3.6

Operating mode

Power-on

Power-down

time

VDDX

(1)

VDD

Invalid supply area

VDDX < VDD + 300 mV

VDDX independent from VDD

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