STM32L433CB datasheet(22/225 Pages) STMICROELECTRONICS

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Functional overview

STM32L433xx

22/225

DS11449 Rev 5

capacitors to be discharged with different time constants during the power- down transient

phase.

Figure 3. Power-up/down sequence

1. VDDX refers to any power supply among VDDA, VDDUSB, VLCD.

3.9.2

Power supply supervisor

The device has an integrated ultra-low-power brown-out reset (BOR) active in all modes

except Shutdown and ensuring proper operation after power-on and during power down.

The device remains in reset mode when the monitored supply voltage VDD is below a

specified threshold, without the need for an external reset circuit.

The lowest BOR level is 1.71V at power on, and other higher thresholds can be selected

through option bytes.The device features an embedded programmable voltage detector

(PVD) that monitors the VDD power supply and compares it to the VPVD threshold. An

interrupt can be generated when VDD drops below the VPVD threshold and/or when VDD is

higher than the VPVD threshold. The interrupt service routine can then generate a warning

message and/or put the MCU into a safe state. The PVD is enabled by software.

In addition, the device embeds a Peripheral Voltage Monitor which compares the

independent supply voltages VDDA, VDDUSB with a fixed threshold in order to ensure that the

peripheral is in its functional supply range.

MSv47490V1

0.3

VBOR0

3.6

Operating mode

Power-on

Power-down

time

VDDX

(1)

VDD

Invalid supply area

VDDX < VDD + 300 mV

VDDX independent from VDD

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