STM32L433CB datasheet(21/225 Pages) STMICROELECTRONICS

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DS11449 Rev 5

21/225

STM32L433xx

Functional overview

•

VBAT = 1.55 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and

backup registers (through power switch) when VDD is not present.

Note:

When the functions supplied by VDDA or VDDUSB are not used, these supplies should

preferably be shorted to VDD.

Note:

If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V

tolerant (refer to Table 19: Voltage characteristics).

Note:

VDDIOx is the I/Os general purpose digital functions supply. VDDIOx represents VDDIO1, with

VDDIO1 = VDD.

Figure 2. Power supply overview

During power-up and power-down phases, the following power sequence requirements

must be respected:

•

When VDD is below 1 V, other power supplies (VDDA, VDDUSB, VLCD) must remain

below VDD + 300 mV.

•

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

During the power-down phase, VDD can temporarily become lower than other supplies only

if the energy provided to the MCU remains below 1 mJ; this allows external decoupling

MSv36866V2

Low voltage detector

VDDA

VDDA domain

VSS

VDD

VBAT

A/D converters

Comparators

D/A converters

Operational amplifiers

Voltage reference buffer

VDD domain

I/O ring

VSSA

Reset block

Temp. sensor

PLL, HSI, MSI, HSI48

Standby circuitry

(Wakeup logic, IWDG)

Voltage regulator

VDDIO1

LSE crystal 32 K osc

BKP registers

RCC BDCR register

RTC

Backup domain

Core

Memories

Digital peripherals

VCORE domain

VCORE

LCD

VLCD

USB transceivers

VDDUSB

VSS

VDD12

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