STM32H747AI datasheet(29/252 Pages) STMICROELECTRONICS

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DS12930 Rev 1

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STM32H747xI/G

Functional overview

The SMPS step-down converter can be used for the following purposes:

•

Direct supply of the VCORE domain

–

the SMPS step-down converter operating modes follow the device system

operating modes (Run, Stop, Standby).

–

the SMPS step-down converter output voltage are set according to the selected

VOS and SVOS bits (voltage scaling)

•

Delivery of an intermediate voltage level to supply the internal voltage regulator (LDO)

–

SMPS step-down converter operating modes

When the SDEXTHP bit is equal to 0 in the PWR_CR3 register, the SMPS step-

down converter follows the device system operating modes (Run, Stop and

Standby).

When the SDEXTHP bit is equal to 1 in PWR_CR3, the SMPS step-down

converter is forced to High-performance mode and does not follow the device

system operating modes (Run, Stop and Standby).

–

The SMPS step-down converter output equals 1.8 V or 2.5 V according to the

selected SD level

•

Delivery of an external supply

–

The SMPS step-down converter is forced to High-performance mode (provided

SDEXTHP bit is equal to 1 in PWR_CR3)

–

The SMPS step-down converter output equals 1.8 V or 2.5 V according to the

selected SD level

3.6

Low-power strategy

There are several ways to reduce power consumption on STM32H747xI/G:

•

Select the SMPS step-down converter as VCORE supply voltage source, as it allows to

enhance power efficiency.

•

Select the adequate voltage scaling

•

Decrease the dynamic power consumption by slowing down the system clocks even in

Run mode, and by individually clock gating the peripherals that are not used.

•

Save power consumption when one or both CPUs are idle, by selecting among the

available low-power mode according to the user application needs. This allows

achieving the best compromise between short startup time, low-power consumption, as

well as available wakeup sources.

The devices feature several low-power modes:

•

CSleep (CPU clock stopped)

•

CStop (CPU sub-system clock stopped)

•

DStop (Domain bus matrix clock stopped)

•

Stop (System clock stopped)

•

DStandby (Domain powered down)

•

Standby (System powered down)

CSleep and CStop low-power modes are entered by the MCU when executing the WFI

(Wait for Interrupt) or WFE (Wait for Event) instructions, or when the SLEEPONEXIT bit of

the Cortex®-Mx core is set after returning from an interrupt service routine.

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