STM32L021D4 datasheet(62/114 Pages) STMICROELECTRONICS

Part #	STM32L021D4

Description	Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES

PDF	114 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Electrical characteristics

STM32L021x4

62/114

DocID027982 Rev 5

6.3.5

Wakeup time from low-power mode

The wakeup times given in the following table are measured with the MSI or HSI16 RC

oscillator. The clock source used to wake up the device depends on the current operating

mode:

•

Sleep mode: the clock source is the clock that was set before entering Sleep mode

•

Stop mode: the clock source is either the MSI oscillator in the range configured before

entering Stop mode, the HSI16 or HSI16/4.

•

Standby mode: the clock source is the MSI oscillator running at 2.1 MHz

All timings are derived from tests performed under ambient temperature and VDD supply

voltage conditions summarized in Table 17.

Table 32. Peripheral current consumption in Stop and Standby mode

Symbol

Peripheral

Typical consumption, TA = 25 °C

Unit

VDD=1.8 V

VDD=3.0 V

IDD(PVD / BOR)

-0.6

µA

IREFINT

-1.25

1.3

LSE Low drive

0.11

0.16

LPTIM1, Input 100 Hz

0.01

0.02

LPTIM1, Input 1 MHz

LPUART1

0.025

0.027

-RTC

0.1

0.19

Table 33. Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ

Max

Unit

tWUSLEEP

Wakeup from Sleep mode

fHCLK = 32 MHz

CPU

cycles

tWUSLEEP_LP

Wakeup from Low-power sleep mode,

fHCLK = 262 kHz

Flash enabled

fHCLK = 262 kHz

Flash switched OFF

910

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