Features

Includes ST state-of-the-art patented technology.

Ultra-low-power features (ultra-low-power devices)

• 1.71 V to 3.6 V power supply

• -40 °C to 85/125 °C temperature range

• VBAT mode: 130 nA (with RTC and 9 x 32-bit backup registers)

• Shutdown mode (6 wake-up pins): 16 nA

• Standby mode (6 wake-up pins): 160 nA with RTC, 30 nA without RTC

• Stop 2 mode: 825 nA with RTC, 695 nA without RTC

• Run mode (LDO mode): 52 μA/MHz

• Batch acquisition mode (BAM)

• 4 μs wake-up from Stop mode

• Brownout reset (BOR)

Core

• 32-bit Arm® Cortex®-M0+ CPU, frequency up to 56 MHz

ART Accelerator

• 1-Kbyte instruction cache allowing 0-wait-state execution from flash memory

Benchmarks

• 1.13 DMIPS/MHz (Drystone 2.1)

• 134 CoreMark® (2.4 CoreMark/MHz at 56 MHz)

• 407 ULPMark™-CP

• 143 ULPMark™-PP

• 19.7 ULPMark™-CM

Memories

• Up to 256-Kbyte single bank flash memory, proprietary code readout protection

• 40-Kbyte SRAM with hardware parity check

Rich analog peripherals (independent supply)

• 1x 12-bit ADC (0.4 μs conversion time), up to 16-bit with hardware oversampling

• 1x 12-bit DAC output channel, low-power sample and hold

• 1x general-purpose operational amplifier with built-in PGA (variable gain up to 16)

• 2x ultra-low-power comparators

LCD driver

• 8×48 or 4×52 segments, with step-up converter

General-purpose inputs/outputs

• Up to 69 fast I/Os, most of them 5 V‑tolerant

20 communication interfaces

• USB 2.0 full-speed crystal-less solution with LPM and BCD

• 7x USARTs/LPUARTs (SPI, ISO 7816, LIN, IrDA, modem)

• 4x I2C interfaces supporting Fast-mode and Fast-mode Plus (up to 1 Mbit/s)

• 3x SPIs, plus 4x USARTs in SPI mode

• IRTIM (Infrared interface)

Security

• Customer code protection

• Robust read out protection (RDP): 3 protection level states and password-based regression (128-bit PSWD)

• Hardware protection feature (HDP)

• Secure boot

• True random number generation, candidate for NIST SP 800-90B certification

• Candidate for Arm® PSA level 1 and SESIP level 3 certifications

• 5 passive anti-tamper pins

• 96-bit unique ID

Clock management

• 4 to 48 MHz crystal oscillator

• 32 kHz crystal oscillator for RTC (LSE)

• Internal 16 MHz factory-trimmed RC (±1%)

• Internal low-power 32 kHz RC (±5%)

• Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)

• Internal 48 MHz with clock recovery

• PLL for system clock, USB, ADC

10 timers, RTC, and 2 watchdogs

• 1x 16-bit advanced motor-control, 1x 32-bit and 3x 16-bit general purpose, 2x 16-bit basic, 3x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer

• RTC with hardware calendar, alarms and calibration

CRC calculation unit

Up to 21 capacitive sensing channels

• Supporting touchkey, linear and rotary touch sensors

12-channel DMA controller

• Flexible mapping (DMAMUX)

Debug

• Development support: serial wire debug (SWD)

All packages are ECOPACK2 compliant.