STM32WBA62CG datasheet(32/185 Pages) STMICROELECTRONICS

32 / 185 page

Functional overview

STM32WBA6xxx

32/185

DS14736 Rev 1

Figure 5. Power-up /down sequence

1. VDDX refers to power supplies VDDA,VDDIO2, and VDDUSB.

3.12.2

Power supply supervisor

The devices have an integrated ultra-low-power BOR (brownout reset) active in all modes.

The BOR ensures proper operation after power on and during power down. The devices

remain 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 devices feature an embedded PVD (programmable voltage

detector) that monitors the VDD power supply and compares it to the VPVD threshold.

An interrupt can be generated when VDD drops below and/or rises above 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.

The devices support dynamic voltage scaling to optimize 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 operates in the following ranges:

•

Range 1 (VCORE = 1.2 V) with CPU and peripherals running at up to 100 MHz

•

Range 2 (VCORE = 0.9 V) with CPU and peripherals running at up to 16 MHz

Low-power modes

The devices support different low-power modes to achieve the best compromise between

low-power consumption, startup time, available peripherals, and available wake-up sources.

MSv47490V1

0.3

VBOR0

3.6

Operating mode

Power-on

Power-down

time

VDDX

(1)

VDD

Invalid supply area

VDDX < VDD + 300 mV

VDDX independent from VDD

STM32WBA62CG Datasheet(PDF) 32 Page - STMicroelectronics

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