STM32WB55CC datasheet(25/165 Pages) STMICROELECTRONICS

25 / 165 page

DS11929 Rev 3

25/165

STM32WB55xx

Functional overview

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 STM32WB55xx devices have different voltage supplies (see Figure 6) and can operate

within the following voltage ranges:

•

VDD = 1.71 V 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 V (ADC/COMPs) to 3.6 V: external analog power supply for ADC,

comparators and voltage reference buffer. The VDDA voltage level can be independent

from the VDD voltage. When not used VDDA should be connected to VDD.

•

VDDUSB = 3.0 V to 3.6 V: external independent power supply for USB transceivers.

When not used VDDUSB should be connected to VDD.

•

VLCD = 2.5 V to 3.6 V: the LCD controller can be powered either externally through the

VLCD pin, or internally from an internal voltage generated by the embedded step-up

converter. This converter can generate a VLCD voltage up to 3.6 V if VDD is higher than

2.0 V.

Table 6. Power supply typical components

Component

Description

Value

SMPS output capacitor(1)

1. e.g. GRM155R60J475KE19.

4.7 µF

SMPS inductance

For 8 MHz(2)

2. e.g. Wurtz 74479774222.

2.2 µH

For 4 MHz(3)

3. e.g. Murata LQM21FN100M70L.

10 µH

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