STM32L15XRC datasheet(15/136 Pages) STMICROELECTRONICS

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DocID022799 Rev 12

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STM32L151xC STM32L152xC

Functional overview

•

Stop mode without RTC

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

HSE crystal oscillators are disabled. 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

also be wakened by the USB wakeup.

•

Standby mode with RTC

Standby mode is used to achieve the lowest power consumption and real time clock.

The internal voltage regulator is switched off so that the entire VCORE domain is

powered off. The PLL, MSI RC, HSI RC and HSE crystal oscillators are also switched

off. The LSE or LSI is still running. After entering Standby mode, the RAM and register

contents are lost except for registers in the Standby circuitry (wakeup logic, IWDG,

RTC, LSI, LSE Crystal 32K osc, RCC_CSR).

The device exits Standby mode in 60 µs when an external reset (NRST pin), an IWDG

reset, a rising edge on one of the three WKUP pins, RTC alarm (Alarm A or Alarm B),

RTC tamper event, RTC timestamp event or RTC Wakeup event occurs.

•

Standby mode without RTC

Standby mode is used to achieve the lowest power consumption. The internal voltage

regulator is switched off so that the entire VCORE domain is powered off. The PLL, MSI

RC, HSI and LSI RC, HSE and LSE crystal oscillators are also switched off. After

entering Standby mode, the RAM and register contents are lost except for registers in

the Standby circuitry (wakeup logic, IWDG, RTC, LSI, LSE Crystal 32K osc,

RCC_CSR).

The device exits Standby mode in 60 µs when an external reset (NRST pin) or a rising

edge on one of the three WKUP pin occurs.

Note:

The RTC, the IWDG, and the corresponding clock sources are not stopped automatically by

entering Stop or Standby mode.

Table 3. Functionalities depending on the operating power supply range

Functionalities depending on the operating power supply range

Operating power supply

range

DAC and ADC

operation

USB

Dynamic voltage

scaling range

I/O operation

VDD= VDDA = 1.65 to 1.71 V

Not functional

Range 2 or

Range 3

Degraded speed

performance

VDD=VDDA= 1.71 to 1.8 V(1)

Not functional

Range 1, Range 2

or Range 3

Degraded speed

performance

VDD=VDDA= 1.8 to 2.0 V(1)

Conversion time up

to 500 Ksps

Not functional

Range 1, Range 2

Range 3

Degraded speed

performance

STM32L15xRC Datasheet(PDF) 15 Page - STMicroelectronics

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