STM32L010R8 datasheet(13/92 Pages) STMICROELECTRONICS

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STM32L010K8 STM32L010R8

Functional overview

3.1

Low-power modes

The STM32L010K8/R8 support dynamic voltage scaling to optimize its power consumption

in Run mode. The voltage from the internal low-drop regulator that supplies the logic, can be

adjusted according to the maximum operating frequency of the system.

There are three power consumption ranges:

•

Range 1 with the CPU running at up to 32 MHz

•

Range 2 with a maximum CPU frequency of 16 MHz

•

Range 3 with a maximum CPU frequency limited to 4.2 MHz

Seven low-power modes are provided 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. The power consumption in this

mode, at 16 MHz, is about 1 mA with all peripherals off.

•

Low-power run mode

This mode is achieved with the multispeed internal (MSI) RC oscillator set to the low-

speed clock (max 131 kHz), execution from SRAM or Flash memory, and internal

regulator in low-power mode to minimize its operating current. In Low-power run mode,

the clock frequency and the number of enabled peripherals are both limited.

•

Low-power sleep mode

This mode is achieved by entering Sleep mode with the internal voltage regulator in

low-power mode to minimize its operating current. In Low-power sleep mode, both the

clock frequency and the number of enabled peripherals are limited; a typical example is

to have a timer running at 32 kHz.

When wakeup is triggered by an event or an interrupt, the system reverts to the Run

mode with the regulator on.

•

Stop mode with RTC

The Stop mode achieves the lowest power consumption while retaining the RAM and

PLL, MSI RC, HSE and HSI RC oscillators are disabled. The LSE or LSI is still running.

The voltage regulator is in Low-power mode.

Some peripherals featuring wakeup capability can enable the HSI RC during Stop

mode to detect their wakeup condition.

The device can be woken up from Stop mode by any of the EXTI line. In 3.5 µs, the

processor serves the interrupt or resume the code. The EXTI line source can be any

GPIO, the RTC alarm/tamper/timestamp/wakeup events, or the

USART/I2C/LPUART/LPTIM wakeup events.

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