STMicroelectronics STM32L151 series microcontrollers feature an ARM Cortex-M3 32-bit core. Suitable for a wide range of portable/battery-powered applications such as gaming, alarm systems, metering and medical equipment and remote sensors for the Internet of Things (IoT).

32MHz ARM Cortex-M3 core ultra-low power microcontroller
Up to 128KB Flash memory with ECC
Up to 16KB RAM
4KB true EEPROM with ECC
Cyclic Redundancy Check (CRC) calculation unit for memory verification
Serial interfaces: USART, SPI, I²C, USB
Up to 24-channel 12-bit ADC
2 x 12-bit DACs
Real-Time Clock (RTC) with backup registers
Up to 20 x capacitive sensing channels
Power supply: +1.8V to +3.6Vdc
7 x low-power modes: Sleep, Low-Power Run, Low-Power Sleep, Stop with RTC, Stop without RTC, Standby with RTC, Standby without RTC
Operating temperature range: -40 to +85°C

STM32L1 Series 32-Bit ARM® Cortex®-M3 Microcontrollers, STMicroelectronics

ARM® Cortex™-M3-based STM32 L1 series uses ST’s proprietary ultra-low-leakage process technology with an innovative autonomous dynamic voltage scaling and five (5) low-power modes offering unprecedented platform flexibility to fit any application. The STM32 L1 series extends the ultra-low power concept with no compromise on performance.

Ultra-Low-Power mode: 300nA with backup registers (3 wakeup pins)
Ultra-Low-Power mode + Real Time Clock (RTC): 900nA with backup registers (3 wakeup pins)
Low-Power Run mode: down to 9μA
Dynamic Run mode: down to 230μA/MHz