STM32WB55RCU6TR 查看數據表（PDF） - STMicroelectronics

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STM32WB55RCU6TR

Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5 and 802.15.4 radio solution

STMicroelectronics 

Functional overview

STM32WB55xx STM32WB35xx

During power up/down, the following power sequence requirements must be respected:

 When VDD is below 1 V the other power supplies (VDDA, VDDUSB, VLCD), must remain

below VDD + 300 mV

 When VDD is above 1 V all power supplies are independent.

Figure 6. Power-up/down sequence

V

3.6

VDDX(1)

VDD

VBOR0

1

Note:

0.3

Power-on

Invalid supply area

Operating mode

VDDX < VDD + 300 mV

Power-down

VDDX independent from VDD

1. VDDX refers to any power supply among VDDA, VDDUSB and VLCD.

time

MSv47490V1

During the power down phase, VDD can temporarily become lower than other supplies only

if the energy provided to the MCU remains below 1 mJ. This allows the external decoupling

capacitors to be discharged with different time constants during the power down transient

phase.

VDD, VDDRF and VDDSMPS must be wired together, so they can follow the same voltage

sequence.

28/193

DS11929 Rev 10

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