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STMicroelectronics STM32L031K6T7
- Part No.:
- STM32L031K6T7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM32L031K6T7.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:650
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Product details
Overview
STM32L031K6T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and targets battery-powered sensor nodes and smart metering endpoints.
For engineers reviewing the STM32L031K6T7 datasheet, STM32L031K6T7 pinout, STM32L031K6T7 application, or STM32L031K6T7 equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled stop mode (0.6 µA with 8 KB RAM retention), 5 µs Flash wakeup time, and 31 5V-tolerant I/Os - all critical for energy-constrained edge sensing and secure firmware update implementations.
Technical Context
The STM32L031K6T7 integrates a Cortex-M0+ core running up to 32 MHz with 0.95 DMIPS/MHz performance, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU scaling. Its power architecture includes dynamic voltage scaling, five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby), and brownout reset with five selectable thresholds.
Analog subsystem includes a 10-channel 12-bit ADC operating down to 1.65 V, two comparators with window mode and wake-up capability, and internal temperature sensor with factory calibration. Peripherals are routed via interconnect matrix supporting concurrent DMA transfers to ADC, USART, SPI, I2C, and timers without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, 32 MHz max - delivers deterministic real-time control with minimal power overhead. |
| Memory | 32 KB Flash (ECC), 8 KB SRAM, 1 KB EEPROM (ECC) - enables robust firmware storage, runtime data buffering, and nonvolatile parameter retention. |
| Power Modes | 0.23 µA Standby (2 wakeup pins), 0.6 µA Stop + RTC + 8 KB RAM - extends coin-cell battery life to >10 years in periodic-sensing applications. |
| ADC | 12-bit, 1.14 Msps, 10 channels, 1.65 V min supply - supports high-resolution analog acquisition in low-voltage industrial sensors. |
| I/O Count | 31 GPIOs, 5V tolerant - simplifies interface to legacy 5V peripherals without level shifters. |
| Clock Sources | HSI16 (±1%), LSE (32 kHz), MSI (65 kHz–4.2 MHz), PLL - enables precise RTC timing and flexible system clocking without external crystals. |
| Timers | 8x timers including 1x ultra-low-power LPTIM, 1x RTC, 2x watchdogs - supports accurate timekeeping, pulse generation, and fail-safe monitoring. |
Pinout & Package
STM32L031K6T7 is housed in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) package compliant with ECOPACK®2 environmental standards. The package supports reflow soldering and offers compact footprint for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply (1.65–3.6 V) | Supplies core and I/O domains; requires local decoupling per datasheet layout guidelines. |
| VSS | Ground reference | Dedicated analog/digital ground pins ensure noise isolation for ADC and comparators. |
| NRST | Active-low reset input | Accepts external reset pulses; internal pull-up enables reliable power-on initialization. |
| PA0–PA15 | General-purpose I/Os | 31 total GPIOs; PA0–PA15, PB0–PB10 mapped per pin definition table; 5V tolerant on most pins. |
| PA1 | ADC_IN1 / TIM2_CH2 | Shared analog input and timer capture channel - enables synchronized sampling and timing in sensor readout sequences. |
| PA4 | SPI1_NSS / USART2_CK | Multi-function pin supporting hardware SPI slave select or USART synchronous clock - reduces external component count in daisy-chained sensor networks. |
| PA13/PA14 | SWDIO/SWCLK | Dedicated Serial Wire Debug interface - allows in-circuit programming and real-time debugging without dedicated JTAG header. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby | 0.23 µA with two wakeup pins active - enables decade-long operation on CR2032 batteries in wireless occupancy sensors. |
| ECC-protected memory | Flash and EEPROM with error correction - prevents silent data corruption in field-deployed firmware and calibration tables. |
| 5V-tolerant I/Os | 31 pins withstand 5.5 V - eliminates level translators when interfacing with legacy UART peripherals or digital sensors. |
| Pre-programmed bootloader | USART and SPI support - enables field firmware updates over existing communication links without debug probe. |
| Temperature sensor | Factory-calibrated ±1.5 °C accuracy - provides on-chip thermal monitoring for battery management and ambient condition logging. |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
Use Scenario: Battery-powered gas/water meter with hourly pressure and temperature sampling, encrypted data transmission, and tamper detection. IC Role / Device Role / Timing Role: Main controller executing metering algorithms, managing AES encryption, and scheduling RTC-triggered ADC conversions. Use Value: 0.6 µA Stop mode + RTC preserves timekeeping and retains 8 KB RAM for session keys while extending battery life beyond 15 years. | Use Scenario: Zigbee/Bluetooth LE node monitoring HVAC duct temperature, humidity, and airflow with wake-on-event behavior. IC Role / Device Role / Timing Role: System-on-chip managing sensor interfaces, low-power radio control, and event-driven wake from standby using comparator window mode. Use Value: Dual comparators with wake-up capability detect threshold breaches (e.g., temperature drift >2°C) and resume full operation in ≤5 µs. |
| Industrial Condition Monitoring | Secure Firmware Update Endpoint |
Use Scenario: Vibration and bearing temperature monitor on rotating machinery, transmitting alerts via RS-485 when anomalies exceed thresholds. IC Role / Device Role / Timing Role: Real-time signal processor acquiring ADC samples at 10 ksps, performing FFT-based spectral analysis in RAM, and triggering UART alarms. Use Value: 41 µA ADC conversion at 10 ksps ensures low-noise acquisition without compromising system-level power budget. | Use Scenario: Field-upgradable IoT gateway module requiring signed firmware validation and rollback protection. IC Role / Device Role / Timing Role: Secure boot loader verifying SHA-256 signatures in EEPROM before flashing new images to protected Flash sectors. Use Value: Sector protection against R/W operations and ECC on both Flash and EEPROM prevent malicious overwrite and bit-flip corruption during OTA updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L011K4T6 | 16 KB Flash, 2 KB SRAM, no EEPROM, same package and core | Lacks EEPROM and reduced RAM limits firmware feature depth and data logging duration | Select when cost sensitivity outweighs need for nonvolatile parameter storage and extended buffer capacity. |
| STM32L051K8U6 | 64 KB Flash, 8 KB SRAM, 2 KB EEPROM, USB 2.0 FS device support | Includes USB PHY and higher memory - adds BOM cost and layout complexity for non-USB use cases | Choose only if USB-based configuration or firmware loading is required; otherwise over-spec'd for pure sensor node roles. |
Compared with STM32L011K4T6, the STM32L031K6T7 provides double Flash and EEPROM plus RTC-enhanced Stop mode for longer battery life; versus STM32L051K8U6, it avoids USB overhead while retaining identical low-power analog capabilities and footprint compatibility.
Availability
STM32L031K6T7 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial condition monitoring, and secure firmware update endpoints requiring stable component supply across long product lifecycles.
Supply support for STM32L031K6T7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security, and integrated analog functionality - optimized for sensor fusion, metering, and edge intelligence at the network edge.
FAQ
What is the maximum operating frequency and associated power consumption in Run mode?
The STM32L031K6T7 runs up to 32 MHz with typical current draw of 76 µA/MHz when executing code from Flash. At full speed, this equates to ~2.43 mA total supply current under standard conditions (3.3 V, 25 °C), verified in Table 24 of DS10668 Rev 6. Dynamic voltage scaling further reduces current at lower frequencies.
Does the device support hardware encryption or secure boot features?
No - the STM32L031K6T7 does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and external secure elements. For hardware-assisted security, ST recommends STM32L4 or STM32H5 series MCUs with dedicated crypto peripherals.
Can the internal 32 kHz LSE oscillator be used for precise RTC timekeeping without an external crystal?
No - the LSE oscillator requires an external 32.768 kHz quartz crystal to achieve ±20 ppm accuracy. The internal LSI RC oscillator (37 kHz) is provided but has ±80% tolerance and is unsuitable for timekeeping; it serves only as a low-power backup clock source.
What debug interface is supported, and are additional pins required?
Serial Wire Debug (SWD) is fully supported using only two pins: PA13 (SWDIO) and PA14 (SWCLK). No JTAG header or additional debug pins are needed. SWD enables full flash programming, breakpoint setting, and real-time variable inspection via standard ARM-compliant debug probes.
STM32L031K6T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM32L0
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L031K6T7 FAQ
1.How can I place an order for STM32L031K6T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L031K6T7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L031K6T7 reliable?
The price and inventory of STM32L031K6T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L031K6T7 is usually 5 days.
3.What payment methods are accepted for STM32L031K6T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L031K6T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L031K6T7?
STM32L031K6T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L031K6T7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L031K6T7?
For technical support, including STM32L031K6T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L031K6T7 requirements.
6.How does Aetrix verify that STM32L031K6T7 is sourced from the original manufacturer or authorized distributors?
All STM32L031K6T7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L031K6T7 meets industry standards.
7.What is the process for return or replacement of STM32L031K6T7?
All STM32L031K6T7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L031K6T7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L031K6T7 part is unused and in its original packaging.
Return procedure for STM32L031K6T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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