STM32U031R8T6

The STM32U031x4/6/8 devices are ultra-low-power microcontrollers based on the high-performance Arm Cortex-M0+ 32-bit RISC core, operating at frequencies up to 56 MHz. These devices incorporate high-speed memory (up to 64 KB Flash and 12 KB SRAM with hardware parity), along with a rich set of enhanced I/Os and peripherals connected to APB and AHB buses and a 32-bit multi-AHB bus matrix. They also integrate protection mechanisms for embedded Flash and SRAM, such as readout protection and write protection. The STM32U031x4/6/8 devices offer one 12-bit ADC, one 12-bit DAC, one embedded rail-to-rail analog comparator, one operational amplifier, one low-power RTC, one general-purpose 32-bit timer, one 16-bit PWM timer dedicated to motor control, three general-purpose 16-bit timers, and two 16-bit low-power timers. These devices also integrate up to 21 capacitive sensing channels. They further feature standard and advanced communication interfaces: three I2C, two SPI, four USART, and two low-power UART. The STM32U031x4/6/8 operates over the temperature ranges of -40 to +85°C (junction temperature +105°C) and -40 to +125°C (junction temperature +130°C), powered by a VDD supply of 1.71 to 3.6V using an internal LDO regulator. Comprehensive power-saving modes enable the design of low-power applications. Independent power supplies are supported: an analog independent power supply input for the ADC, DAC, operational amplifier, and comparator, as well as a VBAT input allowing the RTC and backup registers to remain powered. The STM32U031x4/6/8 is available in eight package options ranging from 20 to 64 pins.

Key features

• Incorporates advanced patented technology.
• 1.71 V to 3.6 V supply voltage.
• -40℃ to 85 / 125℃ temperature range.
• VBAT mode: 130 nA (with RTC and 9×32-bit backup registers).
• Shutdown mode (4 wakeup pins): 16 nA.
• Standby mode (4 wakeup pins): 160 nA with RTC, 30 nA without RTC.
• Stop mode 2: 630 nA with RTC, 515 nA without RTC.
• Run mode (LDO mode): 52 μA/MHz.
• Batch acquisition mode.
• Wakeup time from Stop mode: 4 μs.
• Power-on reset.
• 32-bit Arm Cortex-M0+ CPU, up to 56 MHz.
• 1 KB instruction cache for zero-wait-state Flash execution.
• 1.13 DMIPS/MHz.
• 134 CoreMark.
• Up to 64 KB single-bank Flash with proprietary code readout protection.
• 12 KB SRAM with hardware parity check.
• 1× 12-bit ADC (conversion time 0.4 μs), up to 16-bit via hardware oversampling.
• 1× 12-bit DAC output channel with low-power sample-and-hold.
• 1× general-purpose op-amp with built-in PGA (variable gain up to 16×).
• 1× ultra-low-power comparator.
• Up to 53 fast I/Os, most 5 V-tolerant.
• 6× USART/LPUART.
• 3× I2C interfaces supporting Fast Mode and Fast Mode Plus.
• 2× SPI plus 4× USART in SPI mode.
• Infrared interface.
• Customer code protection.
• Robust readout protection: 3 protection levels with password-based recovery.
• Hardware security features.
• Secure boot.
• True random number generation.
• 5 passive anti-tamper pins.
• 96-bit UID.
• 4 to 48 MHz crystal oscillator.
• 32 kHz crystal oscillator for RTC.
• Internal 16 MHz factory-trimmed RC oscillator.
• Internal low-power 32 kHz RC oscillator.
• Internal multi-speed oscillator, 100 kHz to 48 MHz, auto-trimmed by LSE.
• PLL for system clock and ADC.
• 1× 16-bit advanced motor control timer, 1× 32-bit and 3× 16-bit general-purpose timers, 2× 16-bit basic timers, 2× low-power 16-bit timers, 2× watchdogs, SysTick timer.
• RTC with hardware calendar, alarm, and calibration.
• Up to 18 capacitive sensing channels supporting touch keys, linear and rotary touch sensors.
• 7-channel DMA controller with flexible mapping.
• Development support: Serial Wire Debug.
• All packages ECOPACK2 compliant.