Core: Arm 32-bit Cortex-M0+ CPU, up to 64 MHz Operating temperature: -40°C to 85°C/125°C Memory: Up to 64 KB Flash; 8 KB SRAM (with hardware parity) CRC calculation unit Reset and power management: Voltage range 1.7V to 3.6V; Power-on/Power-down reset (POR/PDR); Brown-out reset (BOR); Programmable voltage detector (PVD); Low-power modes (Sleep, Stop, Standby, Shutdown); VBAT power supports RTC and backup registers Clock management: 4 to 48 MHz crystal oscillator; 32 kHz crystal oscillator (with calibration); Internal 16 MHz RC oscillator (with PLL option, ±1%); Internal 32 kHz RC oscillator (±5%) Up to 44 fast I/Os: All can be mapped to external interrupt vectors; Multiple 5V tolerant I/Os 5-channel DMA controller (with flexible mapping) 12-bit ADC (conversion time 0.4μs, up to 16 external channels; hardware oversampling up to 16-bit; conversion range 0 to 3.6V) 11 timers (1 supporting 128 MHz: 16-bit for advanced motor control; 1 32-bit and 4 16-bit general-purpose timers; 2 low-power 16-bit timers; 2 watchdogs; SysTick timer) Calendar RTC (with alarm function, can periodically wake up from Stop/Standby/Shutdown modes) Package options: SO8N (4.9×6 mm), TSSOP20 (6.4×4.4 mm), LQFP32 (7×7 mm), LQFP48 (7×7 mm), UFQFPN28 (4×4 mm), UFQFPN32 (5×5 mm), UFQFPN48 (7×7 mm), WLCSP18 (1.86×2.14 mm) Communication interfaces: 2 I2C bus interfaces (supporting Fastmode Plus 1 Mbit/s, with extra current sink; 1 supporting SMBus/PMBus and Stop mode wakeup); 2 USARTs (with master/slave synchronous SPI; 1 supporting ISO7816, LIN, IrDA, auto-baud rate detection and wakeup functions); 1 low-power UART; 2 SPIs (32 Mbit/s, 4 to 16 programmable bit frames; 1 multiplexed with I2S interface) Development support: Serial Wire Debug (SWD) 96-bit ID All packages comply with ECOPACK2 standard