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Functional overview STM32L475xx

22/204 DS10969 Rev 5

3.9.3 Voltage regulator

Two embedded linear voltage regulators supply most of the digital circuitries: the main

regulator (MR) and the low-power regulator (LPR).

• The MR is used in the Run and Sleep modes and in the Stop 0 mode.

• The LPR is used in Low-Power Run, Low-Power Sleep, Stop 1 and Stop 2 modes. It is

also used to supply the 32 Kbyte SRAM2 in Standby with SRAM2 retention.

• Both regulators are in power-down in Standby and Shutdown modes: the regulator

output is in high impedance, and the kernel circuitry is powered down thus inducing

zero consumption.

The ultralow-power STM32L475xx supports dynamic voltage scaling to optimize its power

consumption in run mode. The voltage from the Main Regulator that supplies the logic

CORE

) can be adjusted according to the system’s maximum operating frequency.

There are two power consumption ranges:

• Range 1 with the CPU running at up to 80 MHz.

• Range 2 with a maximum CPU frequency of 26 MHz. All peripheral clocks are also

limited to 26 MHz.

The V

CORE

can be supplied by the low-power regulator, the main regulator being switched

off. The system is then in Low-power run mode.

• Low-power run mode with the CPU running at up to 2 MHz. Peripherals with

independent clock can be clocked by HSI16.

3.9.4 Low-power modes

The ultra-low-power STM32L475xx supports seven low-power modes to achieve the best

compromise between low-power consumption, short startup time, available peripherals and

available wakeup sources.

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