STM32L15XVC View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32L15XVC

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 256KB Flash, 32KB SRAM, 8KB EEPROM, LCD, USB, ADC, DAC

STMicroelectronics 

Functional overview

STM32L151xC STM32L152xC

3.1

Low-power modes

The ultra-low-power STM32L151xC and STM32L152xC 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 MSI

range 0 or MSI range 1 clock range (maximum 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

register contents and real time clock. All clocks in the VCORE domain are stopped, the

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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DocID022799 Rev 13

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