Document
STM32L051x6 STM32L051x8
Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0+, up to 64 KB Flash, 8 KB SRAM, 2 KB 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 – 0.27 µA Standby mode (2 wakeup pins) – 0.4 µA Stop mode (16 wakeup lines) – 0.8 µA Stop mode + RTC + 8-Kbyte RAM retention – 88 µA/MHz in Run mode – 3.5 µs wakeup time (from RAM) – 5 µs wakeup time (from Flash memory)
• Core: Arm® 32-bit Cortex®-M0+ with MPU – From 32 kHz up to 32 MHz max. – 0.95 DMIPS/MHz
• Memories – Up to 64-Kbyte Flash memory with ECC – 8-Kbyte RAM – 2 Kbytes of data EEPROM with ECC – 20-byte backup register – Sector protection against R/W operation
• Up to 51 fast I/Os (45 I/Os 5V tolerant)
• Reset and supply management – Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds – Ultra-low-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
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LQFP32 (7x7 mm) LQFP48 (7x7 mm) LQFP64 (10x10 mm)
UFQFPN32 (5x5 mm)
UFQFPN48 (7x7 mm)
Standard and thin WLCSP36 (2.61x2.88 mm)
TFBGA64 (5x5 mm)
• Rich Analog peripherals – 12-bit ADC 1.14 Msps up to 16 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
• 7x peripheral communication interfaces – 2x USART (ISO 7816, IrDA), 1x UART (low power) – Up to 4x SPI 16 Mbits/s – 2x I2C (SMBus/PMBus)
• 9x 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, 1x 16-bit basic, and 2x watchdogs (independent/window)
• CRC calculation unit, 96-bit unique ID
• All packages are ECOPACK2 Table 1. Device summary
Reference
Part number
STM32L051x6 STM32L051x8
STM32L051C6, STM32L051K6, STM32L051R6, STM32L051T6
STM32L051C8, STM32L051K8, STM32L051R8, STM32L051T8
October 2019
This is information on a product in full production.
DS10184 Rev 10
1/133
www.st.com
Contents
Contents
STM32L051x6 STM32L051x8
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 with MPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
3.5 Clock management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 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 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.10 Direct memory access (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.11 Analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.12 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.12.1 Internal voltage reference (VREFINT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.13 Ultra-low-power comparators and reference voltage . . . . . . . . . . . . . . . . 27 3.14 System configuration controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.15 Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . ..