The STM32L071 series of ultra-low power access lines integrates high-performance ARM operating at a frequency of 32 MHz ®  Cortex-M0 ®+32-bit RISC kernel, high-speed embedded memory (up to 32 KB of flash program memory, 1 KB of data EEPROM, and 8 KB of RAM), as well as a wide range of enhanced I/O and peripherals. The STM32L071 device provides high energy efficiency and achieves a wide range of performance. It is achieved through multiple internal and external clock source selections, internal voltage adaptation, and various low-power modes. The STM32L071 device provides various analog functions: 1 12 bit ADC with hardware oversampling function, 2 ultra-low power comparators, AES, multiple timers, 1 low power timer (LPTIM), 3 universal 16 bit timers, 1 RTC, and 1 SysTick that can be used as a time base. They also have two watchdog, one with independent clock and window functions, and one based on bus clock window watchdog. In addition, the STM32L071 device is embedded with standard and advanced communication interfaces: one I2C, one SPI, one USART, and one low-power UART (LPUART). The STM32L071 also includes a real-time clock and a set of backup registers that maintain power supply in standby mode. The ultra-low power STM32L071 device is powered by a 1.8 to 3.6 V power supply with BOR (as low as 1.65 V when powered off) and a 1.65 to 3.6 V power supply without BOR option. Their temperature range is -40 to+125 ° C. A complete set of power-saving modes allows for the design of low-power applications.
main features 
Ultra low power consumption with FlexPowerControl kernel: ARM with FPU ®  32-bit Cortex-M4 ® CPU、 Adaptive Real time Accelerator (ART Accelerator ™）， Allow execution of 0 wait state from flash memory, with frequencies up to 80 MHz, MPU, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1), and DSP instruction clock source. RTC with hardware calendar, alarm, and calibration up to 21 capacitive sensing channels: supports touch buttons, linear and rotary touch sensors. 16x timer: 2 16 bit advanced motor controls, 2 32-bit and 5 16 bit universal, 2 16 bit basic models, 2 low-power 16 bit timers (available in stop mode), 2 watchdog, SysTick timer up to 114 fast I/O, most 5 V limits, up to 14 I/O. Independent power supply as low as 1.08 V-memory 14 channel DMA controller true random number generator CRC computing unit, 96 bit unique ID development support: serial line debugging (SWD), JTAG, embedded tracking macro unit ™