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STM32WB55CC Datasheet(PDF) 24 Page - STMicroelectronics |
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STM32WB55CC Datasheet(HTML) 24 Page - STMicroelectronics |
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24 / 165 page  Functional overview STM32WB55xx 24/165 DS11929 Rev 3 Figure 3. STM32WB55xx external components for the RF part 3.7 Power supply management 3.7.1 Power supply distribution The device integrate an SMPS step-down converter to improve low power performance when the VDD voltage is high enough. This converter has an intelligent mode that automatically enters in bypass mode when the VDD voltage falls below a specific BORx (x = 1, 2, 3 or 4) voltage. By default, at Reset the SMPS is in bypass mode. The device can be operated without the SMPS by just wiring its output to VDD. This is the case for applications where the voltage is low, or where the power consumption is not critical. Table 5. Typical external components Component Description Value C1 Decoupling capacitance for RF 100 nf // 100 pF X1 32 MHz crystal(1) 1. e.g. NDK refernce: NX2016SA 32 MHz EXS00A-CS06654. 32 MHz Antenna filter Antenna filter and matching network Refer to AN5165 Antenna 2.4 GHz band antenna - |
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