STM32G473MB datasheet(24/229 Pages) STMICROELECTRONICS

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Functional overview

STM32G473xB STM32G473xC STM32G473xE

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DS12712 Rev 5

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.

3.11.4

Low-power modes

By default, the microcontroller is in Run mode after system or power Reset. It is up to the

user to select one of the low-power modes described below:

•

Sleep mode: In Sleep mode, only the CPU is stopped. All peripherals continue to

operate and can wake up the CPU when an interrupt/event occurs.

•

Low-power run mode: This mode is achieved with VCORE supplied by the low-power

regulator to minimize the regulator's operating current. The code can be executed from

SRAM or from flash, and the CPU frequency is limited to 2 MHz. The peripherals with

independent clock can be clocked by HSI16.

•

Low-power sleep mode: This mode is entered from the low-power run mode. Only the

CPU clock is stopped. When wakeup is triggered by an event or an interrupt, the

system reverts to the Low power run mode.

•

Stop mode: In Stop mode, the device achieves the lowest power consumption while

retaining the SRAM and register contents. All clocks in the VCORE domain are

stopped. The PLL, as well as the HSI16 RC oscillator and the HSE crystal oscillator are

disabled. The LSE or LSI keep running. The RTC can remain active (Stop mode with

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