STM32WB15CC datasheet(22/127 Pages) STMICROELECTRONICS

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Functional overview

STM32WB15CC

22/127

DS13258 Rev 4

Figure 4. Power distribution

The SMPS can also be switched on or set in bypass mode at any time by the application

software, for example when very accurate ADC measurement are needed.

3.7.2

Power supply schemes

The device has different voltage supplies (see Figure 6) and can operate within the following

voltage ranges:



VDD = 1.71 to 3.6 V: external power supply for I/Os (VDDIO), the internal regulator and

system functions such as RF, SMPS, reset, power management and internal clocks. It

is provided externally through VDD pins. VDDRF and VDDSMPS must be always

connected to VDD pins.



VDDA = 1.62 (ADC/COMPs) to 3.6 V: external analog power supply for ADC and

comparator. The VDDA voltage level can be independent from the VDD voltage. When

not used VDDA must be connected to VDD.

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



When VDD is below 1 V the other power supply (VDDA), must remain below

VDD + 300 mV



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

MS41409V4

LPR

RFR

SMPS

(not used)

LPR

RFR

VDD

SMPS configuration

LDO configuration

VDD

VDDSMPS

VLXSMPS

VFBSMPS

SMPS

SMPS mode or

BYPASS mode

VDDSMPS

VLXSMPS

VFBSMPS

Table 5. Power supply typical components

Component

Description

Value

SMPS output capacitor(1)

1. e.g. GRM155R60J475KE19.

4.7 µF

L1(2)

2. An extra 10 nH inductor in series with L1 is needed to improve the receiver performance,



e.g Murata LQG15WZ10NJ02D

SMPS inductance

For 8 MHz(3)

3. e.g. Wurth 74479774222.

2.2 µH

For 4 MHz(4)

4. e.g. Murata LQM21FN100M70L.

10 µH

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