Product overview
Key Benefits
Energy savings
- Best-in-class static consumption.
- Many ultra-low-power modes for greater flexibility
High compatibility
- Benefitting from the STM32 development ecosystem
- Pin-to-pin compatible with several STM32 products
Cost effectiveness
- Lower BOM costs thanks to high integration.
- Attractive price point.
Description
The STM32U031x4/6/8 devices are ultra-low-power microcontrollers based on the high-performance Arm® Cortex®-M0+ 32-bit RISC core operating at a frequency of up to 56 MHz.
The STM32U031x4/6/8 devices embed high-speed memories (up to 64-Kbyte flash memory and 12-Kbyte SRAM with hardware parity check), and an extensive range of enhanced I/Os and peripherals connected to APB and AHB buses, and a 32-bit multi-AHB bus matrix.
They also embed protection mechanisms for embedded flash memory and SRAM, such as readout protection and write protection.
The STM32U031x4/6/8 devices offer a 12-bit ADC, a 12-bit DAC, an embedded rail-to-rail analog comparator, one operational amplifier, a 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
The devices also embed up to 21 capacitive sensing channels.
They also feature standard and advanced communication interfaces, namely three I2Cs, two SPIs, four USARTs and two low-power UARTs.
The STM32U031x4/6/8 operate in the -40 to +85 °C (+105 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V VDD power supply using an internal LDO regulator. A comprehensive set of power-saving modes makes possible the design of low-power applications.
Independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMP and comparator, as well as VBAT input allowing the backup of the RTC and backup registers.
The STM32U031x4/6/8 offer eight packages from 20 to 64 pins.
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All 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 (4 wake-up pins): 16 nA
- Standby mode (4 wake-up pins): 160 nA with RTC, 30 nA without RTC
- Stop 2 mode: 630 nA with RTC, 515 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)
- 430 ULPMark™-CP
- 167 ULPMark™-PP
- 20.3 ULPMark™-CM
- Memories
- Up to 64-Kbyte single bank flash memory, proprietary code readout protection
- 12-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)
- 1x ultra-low-power comparator
- General-purpose inputs/outputs
- Up to 53 fast I/Os, most of them 5 V‑tolerant
- 16 communication interfaces
- 6x USARTs/LPUARTs (SPI, ISO 7816, LIN, IrDA, modem)
- 3x I2C interfaces supporting Fast-mode and Fast-mode Plus (up to 1 Mbit/s)
- 2x 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)
- PLL for system clock, ADC
- 9 timers, RTC, and 2 watchdogs
- 1x 16-bit advanced motor-control, 1x 32-bit and 3x 16-bit general purpose, 2x 16-bit basic, 2x 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 18 capacitive sensing channels
- Supporting touchkey, linear and rotary touch sensors
- 7-channel DMA controller
- Flexible mapping (DMAMUX)
- Debug
- Development support: serial wire debug (SWD)
- All packages are ECOPACK2 compliant.
Circuit Diagram
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All resources
| Resource title | Version | Latest update |
|---|
System View Description (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| ZIP | 1.0 | 28 May 2024 | 28 May 2024 |
IBIS models (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| ZIP | 1.0 | 12 Jul 2024 | 12 Jul 2024 |
Quality and Reliability
| Part Number | Marketing Status | Package | SMPS | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|---|
| STM32U031C8T6 | Active | LQFP 48 7x7x1.4 mm | - | Industrial | Ecopack2 | |
| STM32U031C8T6TR | Active | LQFP 48 7x7x1.4 mm | - | Industrial | Ecopack2 | |
| STM32U031C8U6 | Active | UFQFPN 48 7x7x0.55 mm | - | Industrial | Ecopack2 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | D/A Converters (typ) (12-bit) | Timers (typ) (16-bit) | Timers (typ) (32-bit) | Number of Channels (typ) | SMPS | Number of Channels (typ) | UART (typ) | I/Os (High Current) | Integrated op-amps | Comparator | SPI (typ) | USART (typ) | Number of Channels (typ) | I2S (typ) | Advanced Motor Control Timers | CAN (2.0) | CAN (FD) | ||
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| STM32U031C8U6 | | | distributors No availability of distributors reported, please contact our sales office |
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| STM32U031C8T6 | | | distributors No availability of distributors reported, please contact our sales office |
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| STM32U031C8T6TR | | | distributors No availability of distributors reported, please contact our sales office |
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STM32U031C8U6 Active
STM32U031C8T6 Active
STM32U031C8T6TR Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors