STM32L443CC datasheet(21/207 Pages) STMICROELECTRONICS

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STM32L443CC STM32L443RC STM32L443VC

Functional overview

Note:

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

tolerant (refer to Table 17: Voltage characteristics).

Note:

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

VDDIO1 = VDD.

Figure 2. Power supply overview

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 devices embed 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.

STM32L443CC データシート(PDF) 21 Page - STMicroelectronics