Datasheet

DS12556 Rev 2 23/201
STM32H750VB STM32H750IB STM32H750XB Functional overview
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3.5.3 Voltage regulator
The same voltage regulator supplies the 3 power domains (D1, D2 and D3). D1 and D2 can
be independently switched off.
Voltage regulator output can be adjusted according to application needs through 5 power
supply levels:
• Run mode (VOS1 to VOS3)
– Scale 1: high performance
– Scale 2: medium performance and consumption
– Scale 3: optimized performance and low-power consumption
• Stop mode (SVOS3 to SVOS5)
– Scale 3: peripheral with wakeup from Stop mode capabilities (UART, SPI, I2C,
LPTIM) are operational
– Scale 4 and 5 where the peripheral with wakeup from Stop mode is disabled
The peripheral functionality is disabled but wakeup from Stop mode is possible
through GPIO or asynchronous interrupt
.
3.6 Low-power strategy
There are several ways to reduce power consumption on STM32H750xB:
• Decrease dynamic power consumption by slowing down the system clocks even in
Run mode and individually clock gating the peripherals that are not used.
• Save power consumption when the CPU is 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.
A domain can enter low-power mode (DStop or DStandby) when the processor, its
subsystem and the peripherals allocated in the domain enter low-power mode.
If part of the domain is not in low-power mode, the domain remains in the current mode.
Finally the system can enter Stop or Standby when all EXTI wakeup sources are cleared
and the power domains are in DStop or DStandby mode.
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