STM32L4 datasheet(22/33 Pages) STMICROELECTRONICS

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Power Supply

• DSI power supply for STM32L4R9xx/S9xx

• DSI (Display Serial Interface) power supply pins

• VDDDSI an independent DSI power supply dedicated to

the DSI regulator and MIPI DPHY

•

It must be connected to VDD

•

VCAPDSI the DSI regulator (1.2V) output

•

It must be connected to VDD12DSI.

• VDD12DSI used to supply the MIPI D-PHY, clock and

data lanes

•

A 2.2 µF must be connected to VDD12DSI

• VSSDSI is an isolated ground supply used for DSI sub-

system

• If DSI is not used:

• VDDDSI must be connected to VDD

• VCAPDSI and VDD12DSI can be left floating

• VSSDSI must be grounded

VDDIO2

VDDA

VDDA domain

Core

SRAMs

Digital

peripherals

VDDIO2 domain

LSE crystal 32K osc

BKP registers

RCC BDCR registers

RTC

Backup domain

VSSA

VSS

I/O ring

PG[15:2]

VDDIO2

VSS

DSI

Voltage regulator

VDDDSI

VCAPDSI

DSI PHY

VDD12DSI

VDDUSB

VCORE domain

VDD domain

I/O ring

VDDIO1

Reset block

Temp. sensor

3 x PLL, HIS, MSI

Standby circuitry

(Wakeup logic, IWDG)

Voltage regulator

Flash memory

VCORE

VDD

VSS

VBAT

Low voltage detector

USB transceivers

A/D converter

D/A converter

Comparators

OPAMP

Voltage reference

buffer

The STM32L4R9xx/S9xx devices feature the DSI (Display

Serial Interface) sub-system and it uses several power

supply pins which are independent from the other supply

pins: VDDDSI, VCAPDSI and VDD12DSI.

If DSI peripheral is not used, the VDDDSI must be

connected to VDD while VCAPDSI and VDD12DSI can be

left floating.

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