STM32H7 datasheet(29/357 Pages) STMICROELECTRONICS

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DS12110 Rev 10

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STM32H742xI/G STM32H743xI/G

Functional overview

3.5.2

Power supply supervisor

The devices have an integrated power-on reset (POR)/ power-down reset (PDR) circuitry

coupled with a Brownout reset (BOR) circuitry:

•

Power-on reset (POR)

The POR supervisor monitors VDD power supply and compares it to a fixed threshold.

The devices remain in Reset mode when VDD is below this threshold,

•

Power-down reset (PDR)

The PDR supervisor monitors VDD power supply. A reset is generated when VDD drops

below a fixed threshold.

The PDR supervisor can be enabled/disabled through PDR_ON pin.

•

Brownout reset (BOR)

The BOR supervisor monitors VDD power supply. Three BOR thresholds (from 2.1 to

2.7 V) can be configured through option bytes. A reset is generated when VDD drops

below this threshold.

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 6 power

supply levels:

•

Run mode (VOS0 to VOS3)

–

Scale 0: boosted performance (available only with LDO regulator)

–

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.

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