STM32G031C4 datasheet(16/117 Pages) STMICROELECTRONICS

16 / 117 page

Functional overview

STM32G031x4/x6/x8

16/117

DS12992 Rev 2

•

VDDIO1 = VDD

VDDIO1 is the power supply for the I/Os. VDDIO1 voltage level is identical to VDD voltage

as it is provided externally through VDD/VDDA pin.

•

VBAT = 1.55 V to 3.6 V. VBAT is the power supply (through a power switch) for RTC,

TAMP, low-speed external 32.768 kHz oscillator and backup registers when VDD is not

present. VBAT is provided externally through VBAT pin. When this pin is not available

on the package, VBAT bonding pad is internally bonded to the VDD/VDDA pin.

•

VREF+ is the analog peripheral input reference voltage, or the output of the internal

voltage reference buffer (when enabled). When VDDA < 2 V, VREF+ must be equal to

VDDA. When VDDA ≥ 2 V, VREF+ must be between 2 V and VDDA. It can be grounded

when the analog peripherals using VREF+ are not active.

The internal voltage reference buffer supports two output voltages, which is configured

with VRS bit of the VREFBUF_CSR register:

–VREF+ around 2.048 V (requiring VDDA equal to or higher than 2.4 V)

–VREF+ around 2.5 V (requiring VDDA equal to or higher than 2.8 V)

VREF+ is delivered through VREF+ pin. On packages without VREF+ pin, VREF+ is

internally connected with VDD, and the internal voltage reference buffer must be kept

disabled (refer to datasheets for package pinout description).

•

VCORE

An embedded linear voltage regulator is used to supply the VCORE internal digital

power. VCORE is the power supply for digital peripherals, SRAM and Flash memory.

The Flash memory is also supplied with VDD.

Figure 2. Power supply overview

MSv47940V1

VDDA domain

RTC domain

A/D converter

Standby circuitry

(Wakeup logic,

IWDG)

Voltage regulator

Core

SRAM

Digital

peripherals

Low-voltage

detector

LSE crystal 32.768 KHz osc

BKP registers

RCC BDCR register

RTC

Voltage reference buffer

I/O ring

VCORE domain

Temp. sensor

Reset block

PLL, HSI

Flash memory

VDDIO1

VREF+

VDD domain

VCORE

VSS

VDD

VBAT

VDDA

VREF+

VSSA

VSS

VDD

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