Features：

 Core

— 32 bits ARM® Cortex® - M0+

— Up to 24 MHz as a maximum frequency

 Memories

— 24 KB Flash memory

— 3 KB SRAM

 Clock system

— Internal 24 MHz RC Oscillator (HSI)

— Internal 32.768 kHz RC Oscillator (LSI)

— 32.768 kHz low speed crystal oscillator (LSE)

— External clock input

 Power management and reset

— Operating voltage：1.7 ~ 5.5 V

— Low power modes: Sleep/Stop

— Power-on/Power-down reset (POR/PDR)

— Brown-out reset (BOR)

 General purpose input and output (I/O)

— Up to 18 I/Os ， all available as externalinterrupts

 1 x 12 bits ADC

—Support up to 8 external input channels and 2internal channels

— Reference sources:Built-in 1.5 V/2.048 V/2.5 V reference voltage,supply voltage Vcc

 Timer

— A 16 bits advanced control timer (TIM1)

— A general purpose 16-bit timer (TIM14)

— A low-power timer (LPTIM)，supports wakeup form stop mode

— An Independent Watching Timer (IWDG)

— A SysTick timer

 Communication interface

— A Serial Peripheral Interface (SPI)

— A Universal Synchronous/AsynchronousTransceiver (USART) with automatic

— A I²C interface,supports standard mode (100kHz).fast mode (400 kHz),support 7 bitsaddressing mode

 Hardware CRC-32 module

 Two comparators

 Unique UID

 Serial wire debug (SWD)

 Working temp.：-40 ~ 85 °C, -40 ~ 105 °C

 Package: QFN20, TSSOP20, SOP20, QFN16，SOP16, SOP14，SOP8