STM32U385CG datasheet(89/224 Pages) STMICROELECTRONICS

89 / 224 page

Figure 25. STM32U385xx power supply scheme (with SMPS)

VDDIO2

VDD

Kernel logic

(CPU, digital

and memories)

logic

Backup circuitry

(LSE, RTC, TAMP,

backup registers)

OUT

GPIOs

OUT

GPIOs

n x 100 nF

+ 10 µF

m x100 nF

logic

+ 4.7 µF

m x VDDIO2

m x VSS

n x VSS

n x VDD

VBAT

VCORE

Power switch

VDDIO2

VDDIO1

ADCs/

DACs/

OPAMPs/

COMPs/

VREFBUF

VREF+

VREF-

VDDA

100 nF

+ 1 µF

VDDA

VSSA

VREF

100 nF+ 1 µF

VSSSMPS

1-2 x VDD11

VLXSMPS

VDDSMPS

VDD

2.2 µH

4.7 μF, or

2 x 2.2 µF

10 µF

SMPS ON

SMPS OFF

LDO

SMPS

VDDUSB

3.3 V

100 nF

Voltage regulator

100 nF

1.65 – 3.6 V

Note:

SMPS and LDO regulators provide, in a concurrent way, the VCORE supply depending on application

requirements. However, only one of them is active at the same time. When SMPS is active, it feeds the VCORE

on the two VDD11 pins supplied by the filtered SMPS VLXSMPS output pin. A 2.2 μH coil and a 2.2 μF capacitor

on each VDD11 pin are then required. When LDO is active, it supplies the VCORE and regulates it using the

same decoupling capacitors on VDD11 pins.

Note:

It is recommended to add a decoupling capacitor of 100 nF near each VDD11 pin/ball, but it is not mandatory.

The external capacitors on VDD11 pins require the following characteristics:

•

COUT = 2 × 2.2 μF ±20%

•

COUT ESR < 20 mΩ at 3 MHz

•

COUT rated voltage ≥ 10 V

STM32U385xx

Electrical characteristics

DS14830 - Rev 2

page 89/224

STM32U385CG Datasheet(PDF) 89 Page - STMicroelectronics

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