STM32H7B3AI datasheet(15/238 Pages) STMICROELECTRONICS

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Figure 2. Power-up/power-down sequence

0.3

VPDR

3.6

Operating mode

Power-on

Power-down

time

VDDX(1)

VDD

Invalid supply area

VDDX < VDD + 300 mV

VDDX independent from VDD

VPOR

VDDx refers to any power supply among VDDA, VDD33USB and VDD50USB.

VDD and VDDSMPS must be wired together into order to follow the same voltage sequence.

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.

•

Programmable voltage detector (PVD)

The PVD monitors the VDD power supply by comparing it with a threshold selected from a set of predefined

values.

It can also monitor the voltage level of the PVD_IN pin by comparing it with an internal VREFINT voltage

reference level.

•

Analog voltage detector (AVD)

The AVD monitors the VDDA power supply by comparing it with a threshold selected from a set of predefined

values.

•

VBAT threshold

The VBAT battery voltage level can be monitored by comparing it with two thresholds levels.

•

Temperature threshold

A dedicated temperature sensor monitors the junction temperature and compare it with two threshold levels.

STM32H7B3xI

Power supply management

DS13139 - Rev 8

page 15/238

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