STMicroelectronics STM32L051R6T6, 32bit ARM Cortex M0+ Microcontroller, STM32L0, 32MHz, 32 kB Flash, 64-Pin LQFP

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 KB 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 KB Flash memory with ECC
8KB RAM
2 KB 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
Rich Analogue 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 (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