STMicroelectronics Electronic Components Datasheet

STM32L021K4 Datasheet

32-bit MCU

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STM32L021D4 STM32L021F4

STM32L021G4 STM32L021K4

Access line ultra-low-power 32-bit MCU Arm®-based

Cortex®-M0+, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES

Datasheet - production data

Features

• Ultra-low-power platform

– 1.65 V to 3.6 V power supply

– -40 to 125 °C temperature range

– 0.23 µA Standby mode (2 wakeup pins)

– 0.29 µA Stop mode (16 wakeup lines)

– 0.54 µA Stop mode + RTC + 2 KB RAM

retention

– Down to 76 µA/MHz in Run mode

– 5 µs wakeup time (from Flash memory)

– 41 µA 12-bit ADC conversion at 10 ksps

• Core: Arm® 32-bit Cortex®-M0+

– From 32 kHz to 32 MHz max.

– 0.95 DMIPS/MHz

• Reset and supply management

– Ultra-safe, low-power BOR (brownout reset)

with 5 selectable thresholds

– Ultralow power POR/PDR

– Programmable voltage detector (PVD)

• Clock sources

– 0 to 32 MHz external clock

– 32 kHz oscillator for RTC with calibration

– High speed internal 16 MHz factory-trimmed RC

(+/- 1%)

– Internal low-power 37 kHz RC

– Internal multispeed low-power 65 kHz to

4.2 MHz RC

– PLL for CPU clock

• Pre-programmed bootloader

– USART, SPI supported

• Development support

– Serial wire debug supported

• Up to 28 fast I/Os (23 I/Os 5V tolerant)

• Memories

– 16 KB Flash memory with ECC

– 2 KB RAM

– 512 B of data EEPROM with ECC

– 20-byte backup register

– Sector protection against R/W operation

–

TSSOP14/20

169 mils

UFQFPN20 3x3 mm

UFQFPN28 4x4 mm

UFQFPN32 5x5 mm

LQFP32

7x7 mm

• Rich Analog peripherals

– 12-bit ADC 1.14 Msps up to 10 channels (down

to 1.65 V)

– 2x ultra-low-power comparators (window mode

and wake up capability, down to 1.65 V)

• 5-channel DMA controller, supporting ADC, SPI,

I2C, USART, Timers, AES

• 4x peripherals communication interface

• 1x USART (ISO 7816, IrDA), 1x UART (low power)

• 1x SPI 16 Mbits/s

• 1x I2C (SMBus/PMBus)

• 7x timers: 1x 16-bit with up to 4 channels, 1x 16-bit

with up to 2 channels, 1x 16-bit ultra-low-power

timer, 1x SysTick, 1x RTC and 2x watchdogs

(independent/window)

• CRC calculation unit, 96-bit unique ID

• Hardware Encryption Engine AES 128-bit

• All packages are ECOPACK®2

September 2017

This is information on a product in full production.

DocID027982 Rev 5

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STMicroelectronics Electronic Components Datasheet

STM32L021K4 Datasheet

32-bit MCU

No Preview Available !

Contents

STM32L021x4

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.2 Ultra-low-power device continuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2 Interconnect matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.3 Arm® Cortex®-M0+ core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.4 Reset and supply management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.4.1 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.4.2 Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.4.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.4.4 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.5 Clock management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.6 Low-power real-time clock and backup registers . . . . . . . . . . . . . . . . . . . 24

3.7 General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.8 Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.9 Direct memory access (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.10 Analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.11 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.11.1 Internal voltage reference (VREFINT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.12 Ultra-low-power comparators and reference voltage . . . . . . . . . . . . . . . . 27

3.13 System configuration controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.14 AES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.15 Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.15.1 General-purpose timers (TIM2, TIM21) . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.15.2 Low-power Timer (LPTIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.15.3 SysTick timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.15.4 Independent watchdog (IWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.15.5 Window watchdog (WWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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STM32L021K4 Datasheet

32-bit MCU

STM32L021K4 Datasheet

32-bit MCU

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