STM32WB35CEU6A datasheet(27/196 Pages) STMICROELECTRONICS

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DS11929 Rev 14

27/196

STM32WB55xx STM32WB35xx

Functional overview

Figure 5. 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 devices have different voltage supplies (see Figure 7 and Figure 8) 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,

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

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

•

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

not used VDDUSB must be connected to VDD or ground.

•

VLCD = 2.5 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. Note that the LCD is available only on STM32WB55xx devices.

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 6. Power supply typical components

Component

Description

Value

SMPS output capacitor(1)

1. Such as GRM155R60J475KE19.

4.7 µF

L1(2)

2. To improve the receiver performance an extra 10 nH inductor (e.g Murata LQG15WZ10NJ02D) in series

with L1 is needed.

SMPS inductance

For 8 MHz(3)

3. Such as Wurth 74479774222.

2.2 µH

For 4 MHz(4)

4. Such as Murata LQM21FN100M70L.

10 µH

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