STM32L552CCT3PTR datasheet(32/340 Pages) STMICROELECTRONICS

32 / 340 page

Functional overview

STM32L552xx

32/340

DS12737 Rev 6

3.9

Power supply management

The power controller (PWR) main features are:

•

Power supplies and supply domains

–

Core domains (VCORE)

–

VDD domain

–

Backup domain (VBAT)

–

Analog domain (VDDA)

–

VDDIO2 domain

–

VDDUSB for USB transceiver

•

System supply voltage regulation

–

SMPS step down converter

–

Voltage regulator (LDO)

•

Power supply supervision

–

POR/PDR monitor

–

BOR monitor

–PVD monitor

–

PVM monitor (VDDA, VDDUSB, VDDIO2)

–

Temperature thresholds monitor

–

Upper VDD voltage threshold monitor

•

Power management

–

Operating modes

–

Voltage scaling control

–

Low-power modes

•

VBAT battery charging

•

TrustZone security

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

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 = 1.62 V (ADCs/COMPs) / 1.8 V (DACs/OPAMPs) to 2.4 V (VREFBUF) to 3.6 V

VDDA is the external analog power supply for A/D converters, D/A converters, voltage

reference buffer, operational amplifiers and comparators. The VDDA voltage level is

independent from the VDD voltage and should preferably be connected to VDD when

these peripherals are not used.

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