STM32G474PBY3XXX datasheet(24/236 Pages) STMICROELECTRONICS

24 / 236 page

Functional overview

STM32G474xB STM32G474xC STM32G474xE

24/236

DS12288 Rev 5

•

VBAT = 1.55 V to 3.6 V

VBAT is the power supply for RTC, external clock 32 kHz oscillator and backup registers

(through power switch) when VDD is not present.

•

VREF-, VREF+

VREF+ is the input reference voltage for ADCs and DACs. It is also 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.

The internal voltage reference buffer supports three output voltages, which are

configured with VRS bits in the VREFBUF_CSR register:

–VREF+ = 2.048 V

–VREF+ = 2.5 V

–VREF+ = 2.95 V

VREF- is double bonded with VSSA.

3.11.2

Power supply supervisor

The device has an integrated ultra-low-power brown-out reset (BOR) 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 device features an embedded programmable voltage detector

(PVD) that monitors the VDD power supply and compares it to the VPVD threshold. An

interrupt can be generated when VDD drops below the VPVD threshold and/or when VDD is

higher than 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 device embeds a peripheral voltage monitor which compares the

independent supply voltages VDDA, with a fixed threshold in order to ensure that the

peripheral is in its functional supply range.

3.11.3

Voltage regulator

Two embedded linear voltage regulators, main regulator (MR) and low-power regulator

(LPR), supply most of digital circuitry in the device. The MR is used in Run and Sleep

modes. The LPR is used in Low-power run, Low-power sleep and Stop modes. In Standby

and Shutdown modes, both regulators are powered down and their outputs set in high-

impedance state, such as to bring their current consumption close to zero.

The device supports 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 (MR) operates in the following ranges:

•

Range 1 boost mode with the CPU running at up to 170 MHz.

•

Range 1 normal mode with CPU running at up to 150 MHz.

•

Range 2 with a maximum CPU frequency of 26 MHz.

STM32G474PBY3XXX Datasheet(PDF) 24 Page - STMicroelectronics

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