STM32WB35CEU6A datasheet(33/196 Pages) STMICROELECTRONICS

33 / 196 page

DS11929 Rev 14

33/196

STM32WB55xx STM32WB35xx

Functional overview

The system clock after wake-up is 16 MHz, derived from the HSI16. If used, the SMPS

is restarted automatically. In this mode the RF can be used.

•

Shutdown

This mode achieves the lowest power consumption. The internal regulator is switched

off so that the VCORE domain is powered off.

The RTC can remain active (Shutdown mode with RTC, Shutdown mode without RTC).

The BOR is not available in Shutdown mode. No power voltage monitoring is possible

in this mode, therefore the switch to Backup domain is not supported.

SRAM1, SRAM2a, SRAM2b and register contents are lost except for registers in the

Backup domain.

The device exits Shutdown mode when an external reset (NRST pin), a WKUP pin

event (configurable rising or falling edge), or an RTC event occurs (alarm, periodic

wake-up, timestamp, tamper).

The system clock after wake-up is 4 MHz, derived from the MSI.

In this mode the RF is no longer operational.

When the RF subsystem is active, it changes the power state according to its needs (Run,

Stop, Standby). This operation is transparent for the CPU1 host application and managed by

a dedicated HW state machine. At any given time the effective power state reached is the

higher one needed by both the CPU1 and RF sub-system.

Table 7 summarizes the peripheral features over all available modes. Wake-up capability is

detailed in gray cells.

Table 7. Features over all modes(1)

Peripheral(2)

Stop0/Stop1

Stop 2

Standby Shutdown

CPU1

CPU2

Radio system (Bluetooth

Low Energy, 802.15.4)

YY(3)

Y-

YY(4) Y(4)

Flash memory

Y (5)

YO(6) O(6)

-R

SRAM1

Y(7)

YY(7)

-R

SRAM2a

Y(7)

YY(7)

-R

-R(8)

SRAM2b

Y(7)

YY(7)

-R

Quad-SPI

Backup registers

-R

Brown-out reset (BOR)

Y-

Programmable voltage

detector (PVD)

OOO

O-

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