STM32L081CB STM32L081CZ STM32L081KZ Access line ultra-low-power 32-bit MCU Arm -based Cortex -M0+, up to 192KB Flash, 20KB SRAM, 6KB EEPROM, ADC, AES Datasheet - production data Features Ultra-low-power platform 1.65 V to 3.6 V power supply -40 to 125 C temperature range UFQFxPN32 0.29 A Standby mode (3 wakeup pins) (5x5 mm) LQFP32 7x7 mm UFQFPN48 LQFP48 7x7 mm 0.43 A Stop mode (16 wakeup lines) (7x7 mm) 0.86 A Stop mode + RTC + 20-Kbyte RAM retention Rich Analog peripherals Down to 93 A/MHz in Run mode 12-bit ADC 1.14 Msps up to 16 channels (down 5 s wakeup time (from Flash memory) to 1.65 V) 41 A 12-bit ADC conversion at 10 ksps 2x ultra-low-power comparators (window mode and wake up capability, down to 1.65 V) Core: Arm 32-bit Cortex -M0+ with MPU 7-channel DMA controller, supporting ADC, SPI, From 32 kHz up to 32 MHz max. I2C, USART, Timers, AES 0.95 DMIPS/MHz Up to 10x peripheral communication interfaces Memories 4x USART (2 with ISO 7816, IrDA), 1x UART Up to 192-Kbyte Flash memory with ECC(2 (low power) banks with read-while-write capability) Up to 6x SPI 16 Mbits/s 20 -Kbyte RAM 3x I2C (2 with SMBus/PMBus) 6 Kbytes of data EEPROM with ECC 11x timers: 2x 16-bit with up to 4 channels, 2x 16-bit 20-byte backup register with up to 2 channels, 1x 16-bit ultra-low-power Sector protection against R/W operation timer, 1x SysTick, 1x RTC, 2x 16-bit basic, and 2x Up to 40 fast I/Os (31 I/Os 5V tolerant) watchdogs (independent/window) Reset and supply management CRC calculation unit, 96-bit unique ID Ultra-safe, low-power BOR (brownout reset) Hardware Encryption Engine AES 128-bit with 5 selectable thresholds Ultra-low-power POR/PDR All packages are ECOPACK2 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, I2C, SPI supported Development support Serial wire debug supported November 2019 DS10888 Rev 6 1/118 This is information on a product in full production. www.st.comContents STM32L081xx Contents 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 (V ) . 27 REFINT 3.13 Ultra-low-power comparators and reference voltage 27 3.14 AES . 28 3.15 Timers and watchdogs . 28 3.15.1 General-purpose timers (TIM2, TIM3, TIM21 and TIM22) . 28 3.15.2 Low-power Timer (LPTIM) . 29 3.15.3 Basic timer (TIM6, TIM7) 29 3.15.4 SysTick timer . 29 3.15.5 Independent watchdog (IWDG) . 29 3.15.6 Window watchdog (WWDG) . 30 2/118 DS10888 Rev 6