STM32L021F4U6TR                Description

The ultra-low-power STM32L021x4 family includes devices in 6 different package types from 14 to 32 pins. The description below gives an overview of the complete range of peripherals proposed in this family.

STM32L021F4U6TR             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

STM32L021F4U6TR        applications

These features make the ultra-low-power STM32L021x4 microcontrollers suitable for a wide

range of applications:

? Gas/water meters and industrial sensors

? Healthcare and fitness equipment

? Remote control and user interface

? PC peripherals, gaming, GPS equipment

? Alarm system, wired and wireless sensors, video intercom