STM32F398VE datasheet(15/151 Pages) STMICROELECTRONICS

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STM32F398VE

Functional overview

3.7

Power management

3.7.1

Power supply schemes



VSS, VDD = 1.8 V ± 8% V: external power supply for I/Os and the internal regulator. It is

provided externally through VDD pins.



VSSA, VDDA = 1.65 to 3.6 V: external analog power supply for ADC, DAC, comparators,

operational amplifier, reset blocks, RCs and PLL. The minimum voltage to be applied to

VDDA differs from one analog peripheral to another. Table 2 provides the summary of

the VDDA ranges for analog peripherals. The VDDA voltage level must always be greater

than or equal to the VDD voltage level and must be provided first.



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

backup registers (through power switch which is guaranteed in the full range of VDD)

when VDD is not present.

3.7.2

Power supply supervisor

The device power-on reset (POR) is controlled through the external NPOR pin. The device

remains in reset state when NPOR pin is held low.

To guarantee a proper power-on reset, the NPOR pin must be held low when VDDA is

applied. Then, when VDD is stable, the reset state can be exited through one of the following

ways:



by putting the NPOR pin in high impedance, NPOR pin has an internal pull up,



by forcing the pin to high level by connecting it to VDDA.

3.7.3

Low-power modes

The STM32F398VE supports three low-power modes to achieve the best compromise

between low power consumption, short startup time and available wakeup sources:



Sleep mode

In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can

wake up the CPU when an interrupt/event occurs.



Stop mode

Stop mode achieves the lowest power consumption while retaining the content of

SRAM and registers. All clocks in the 1.8 V domain are stopped, the PLL, the HSI RC

and the HSE crystal oscillators are disabled. The voltage regulator can also be put

either in normal or in low-power mode.

The device can be woken up from Stop mode by any of the EXTI line. The EXTI line

source can be one of the 16 external lines, the RTC alarm, COMPx, I2Cx or U(S)ARTx.

Table 2. External analog supply values for analog peripherals

Analog peripheral

Minimum VDDA supply

Maximum VDDA supply

ADC/COMP

1.8 V

3.6 V

DAC/OPAMP

2.4 V

3.6 V

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