STM32L031C4T6             Description

 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.

STM32L031C4T6            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

? 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

– 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-Kbyte Flash with ECC

– 8-Kbyte RAM

– 1-Kbyte of data EEPROM with ECC

– 20-byte backup register

– Sector protection against R/W operation

STM32L031C4T6            Applications

Low-power modes