STM32L162RC datasheet(13/123 Pages) STMICROELECTRONICS

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STM32L162VC, STM32L162RC

3.1

Low-power modes

The ultra-low-power STM32L162xC devices 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 system’s maximum operating frequency

and the external voltage supply.

There are three power consumption ranges:

•

Range 1 (VDD range limited to 1.71 V - 3.6 V), with the CPU running at up to 32 MHz

•

Range 2 (full VDD range), with a maximum CPU frequency of 16 MHz

•

Range 3 (full VDD range), with a maximum CPU frequency limited to 4 MHz (generated

only with the multispeed internal RC oscillator clock source)

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. Sleep mode power consumption 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

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

regulator in low-power mode to minimize the regulator's 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 the regulator’s operating current. In Low-power sleep

mode, both the clock frequency and the number of enabled peripherals are limited; a

typical example would be 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

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

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

running. The voltage regulator is in the low-power mode.

The device can be woken up from Stop mode by any of the EXTI line, in 8 µs. The EXTI

line source can be one of the 16 external lines. It can be the PVD output, the

Comparator 1 event or Comparator 2 event (if internal reference voltage is on), it can

be the RTC alarm(s), the USB wakeup, the RTC tamper events, the RTC timestamp

event or the RTC wakeup.

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