STM32WB55VC View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32WB55VC

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

STMicroelectronics 

Functional overview

STM32WB55xx STM32WB35xx

Figure 4. External components for the RF part

OSC_IN

OSC_OUT

VDDRF

X1 32 MHz

VDD

STM32WB

microcontroller

VSSRF

C1

(including exposed pad)

Lf1

Cf1

Antenna

Cf2

RF1

AntLefn2na filter

Note:

3.7

3.7.1

MS53575V1

Table 5. Typical external components

Component

Description

Value

C1

X1

Antenna filter

Antenna

Decoupling capacitance for RF

32 MHz crystal(1)

Antenna filter and matching network

2.4 GHz band antenna

100 nF // 100 pF

32 MHz

Refer to AN5165, on www.st.com

-

1. e.g. NDK reference: NX2016SA 32 MHz EXS00A-CS06654.

For more details refer to AN5165 “Development of RF hardware using STM32WB

microcontrollers” available on www.st.com.

Power supply management

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.

26/193

DS11929 Rev 10

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