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STM32WB55CC bảng dữ liệu(PDF) 26 Page - STMicroelectronics

tên linh kiện STM32WB55CC
Giải thích chi tiết về linh kiện  Multiprotocol wireless 32-bit MCU Arm
PDF  165 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STM32WB55CC bảng dữ liệu(HTML) 26 Page - STMicroelectronics

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Functional overview
STM32WB55xx
26/165
DS11929 Rev 3
During power up/ down, the following power sequence requirements must be respected:
•
When VDD is below 1 V, other power supplies (VDDA, VDDUSB, VLCD), must remain
below VDD + 300 mV
•
When VDD is above 1 V, all power supplies are independent.
Figure 5. Power-up/down sequence
1. VDDX refers to any power supply among VDDA, VDDUSB, VLCD.
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.
Note:
VDD, VDDRF and VDDSMPS must be wired together, so they follow the same voltage
sequence.



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