Document
STM32L031x4 STM32L031x6
Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0+, up to 32KB Flash, 8KB SRAM, 1KB EEPROM, ADC
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) – 0.35 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
TSSOP20 UFQFPN28 4x4 mm 169 mils UFQFPN32 5x5 mm
UFQFPN48 7x7 mm
LQFP32/48 7x7 mm
WLCSP25 2.097x2.493 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)
• 7-channel DMA controller, supporting ADC, SPI, I2C, USART, Timers
• 5x peripherals communication interface
• 1x USART (ISO 7816, IrDA), 1x UART (low power)
• Up to 2 SPI interfaces, up to 16 Mbits/s
• 1x I2C (SMBus/PMBus)
• 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)
• CRC calculation unit, 96-bit unique ID • All packages are ECOPACK®2
Table 1. Device summary
Reference
Part number
STM32L031x4
STM32L031G4, STM32L031K4, STM32L031C4, STM32L031E4, STM32L031F4
STM32L031x6
STM32L031G6, STM32L031K6, STM32L031C6, STM32L031E6, STM32L031F6
March 2018
This is information on a product in full production.
DS10668 Rev 6
1/126
www.st.com
Contents
Contents
STM32L031x4/6
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 2.2 Ultra-low-power device continuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 Interconnect matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3 Arm® Cortex®-M0+ core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.4 Reset and supply management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4.1 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.4.2 Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.4.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4.4 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5 Clock management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.6 Low-power real-time clock and backup registers . . . . . . . . . . . . . . . . . . . 25 3.7 General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.8 Extended interrupt/event controller (EXTI) . . . . . . . . . . . . . . . . . . . . . . . . 26 3.9 Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.10 Direct memory access (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.11 Analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.12 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.12.1 Internal voltage reference (VREFINT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.13 Ultra-low-power comparators and reference voltage . . . . . . . . . . . . . . . . 28 3.14 System configuration controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .