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STM32WB55CC Datasheet(PDF) 26 Page - STMicroelectronics

Part # STM32WB55CC
Description  Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5.2 and 802.15.4 radio solution
PDF  193 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32WB55CC Datasheet(HTML) 26 Page - STMicroelectronics

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Functional overview
STM32WB55xx STM32WB35xx
26/193
DS11929 Rev 11
Figure 4. External components for the RF part
Note:
For more details refer to AN5165 “Development of RF hardware using STM32WB
microcontrollers” available on www.st.com.
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 reference: NX2016SA 32 MHz EXS00A-CS06654.
32 MHz
Antenna filter
Antenna filter and matching network
Refer to AN5165, on www.st.com
Antenna
2.4 GHz band antenna
-
MS53575V1
STM32WB
microcontroller
VDD
OSC_IN
OSC_OUT
VDDRF
VSSRF
RF1
Antenna
Cf1
Cf2
Lf1
Lf2
X1
C1
Antenna filter
(including exposed pad)
32 MHz



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