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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
1/114
www.st.com


STMicroelectronics Electronic Components Datasheet

STM32L021K4 Datasheet

32-bit MCU

No Preview Available !

Contents
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
2/114
DocID027982 Rev 5


Part Number STM32L021K4
Description 32-bit MCU
Maker STMicroelectronics
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STM32L021K4 Datasheet PDF






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