STM32F372VB datasheet(14/128 Pages) STMICROELECTRONICS

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Functional overview

STM32F37x

14/128

Doc ID 022691 Rev 3

3.7

Power management

3.7.1

Power supply schemes

●

VDD: external power supply for I/Os and the internal regulator. It is provided externally

through VDD pins, and can be 2.0 to 3.6 V.

●

VDDA = 2.0 to 3.6 V:

–

external analog power supplies for Reset blocks, RCs and PLL

–

supply voltage for 12-bit ADC, DACs and comparators (minimum voltage to be

applied to VDDA is 2.4 V when the 12-bit ADC and DAC are used).

●

VDDSD12 and VDDSD3 = 2.2 to 3.6 V: supply voltages for SDADC1/2 and SDADCD3

sigma delta ADCs. Independent from VDD/VDDA.

●

VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and backup

registers when VDD is not present.

3.7.2

Power supply supervisor

●

The device has an integrated power-on reset (POR)/power-down reset (PDR) circuitry.

It is always active, and ensures proper operation starting from/down to 2 V. The device

remains in reset mode when VDD is below a specified threshold, VPOR/PDR, without the

need for an external reset circuit. The POR monitors only the VDD supply voltage.

During the startup phase it is required that VDDA should arrive first and be greater than

or equal to VDD.

●

The PDR monitors both the VDD and VDDA supply voltages, however the VDDA power

supply supervisor can be disabled (by programming a dedicated Option bit) to reduce

the power consumption if the application design ensures that VDDA is higher than or

equal to VDD.

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.

3.7.3

Voltage regulator

The regulator has three operation modes: main (MR), low power (LPR), and power-down.

●

The MR mode is used in the nominal regulation mode (Run)

●

The LPR mode is used in Stop mode.

●

The power-down mode is used in Standby mode: the regulator output is in high

impedance, and the kernel circuitry is powered down thus inducing zero consumption.

The voltage regulator is always enabled after reset. It is disabled in Standby mode.

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