STM32WB15CC datasheet(27/127 Pages) STMICROELECTRONICS

27 / 127 page

DS13258 Rev 4

27/127

STM32WB15CC

Functional overview

The system clock after wakeup is 16 MHz, derived from the HSI16. This low power

mode is not selectable for Radio activity.



Shutdown

The Shutdown mode allows to achieve the ultimate 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

wakeup, timestamp, tamper).

The system clock after wakeup is 4 MHz, derived from the MSI.

This low-power mode is not selectable for Radio activity.

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 6 summarizes the peripheral features over all available modes. Wakeup capability is

detailed in gray cells.

Table 6. Functionalities depending on system operating mode(1)

Peripheral

Stop0

Stop1

Standby Shutdow

CPU1

CPU2

Radio-system (BLE)

Y-

Flash memory

-R

SRAM1

Y O(2) YO(2)

-R

-O(2)

SRAM2a

Y O(2) YO(2)

-R

-O(2)

SRAM2b

Y O(2) YO(2)

-R

-O(2)

Backup registers

-R

Brown-out reset (BOR)

Y-

Brown-out SMPS



force bypass (BOR)

YYY

Y-

Programmable voltage detector

(PVD)

O-

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