The access line ultra-low-power STM32L031x4/6 family incorporates the high-performance Arm® Cortex®-M0+ 32-bit RISC core operating at a 32 MHz frequency, high-speed embedded memories (up to 32 Kbytes of Flash program memory, 1 Kbytes of data EEPROM and 8 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals.
The STM32L031x4/6 devices provide high power efficiency for a wide range of performance. It is achieved with a large choice of internal and external clock sources, an internal voltage adaptation and several low-power modes.
The STM32L031x4/6 devices offer several analog features, one 12-bit ADC with hardware oversampling, two ultra-low-power comparators, several timers, one low-power timer (LPTIM), three general-purpose 16-bit timers, one RTC and one SysTick which can be used as timebases. They also feature two watchdogs, one watchdog with independent clock and window capability and one window watchdog based on bus clock.
Moreover, the STM32L031x4/6 devices embed standard and advanced communication interfaces: one I2C, one SPI, one USART, and a low-power UART (LPUART).
The STM32L031x4/6 also include a real-time clock and a set of backup registers that remain powered in Standby mode.
The ultra-low-power STM32L031x4/6 devices operate from a 1.8 to 3.6 V power supply (down to 1.65 V at power down) with BOR and from a 1.65 to 3.6 V power supply without BOR option. They are available in the -40 to +125 °C temperature range. A comprehensive set of power-saving modes allows the design of low-power applications.
**Key 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)
0.35 μA Stop mode (16 wakeup lines)
0.6 μA Stop mode + RTC + 8 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 up to 32 MHz max.
0.95 DMIPS/MHz
Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds
Ultralow power POR/PDR
Programmable voltage detector (PVD)
Clock sources
1 to 25 MHz crystal oscillator
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 38 fast I/Os (31 I/Os 5V tolerant)
Memories
Up to 32 KB Flash with ECC
8 KB RAM
1 KB of data EEPROM with ECC
20-byte backup register
Sector protection against R/W operation
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)
8x timers: 1x 16-bit with up to 4 channels, 2x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC and 2x watchdogs (independent/window)
