STMicroelectronics STM32L031F4P6

Overview

STM32L031F4P6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in TSSOP20 package, featuring 16 KB Flash, 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 delivers 76 µA/MHz in Run mode - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031F4P6 datasheet, STM32L031F4P6 pinout, STM32L031F4P6 application, or STM32L031F4P6 equivalent, key selection criteria include standby current (0.23 µA), RTC + 8 KB RAM retention in Stop mode (0.6 µA), 5 µs Flash wakeup time, and 31 I/Os with 5V tolerance - critical for energy-constrained industrial and IoT edge devices.

Technical Context

The STM32L031F4P6 integrates a single-core Arm Cortex-M0+ running up to 32 MHz with dynamic voltage scaling, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC, and PLL for CPU clock multiplication. Its low-power architecture includes five operational modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby) with hierarchical wakeup capability via 16 lines or 2 pins.

Analog subsystem includes a 12-bit ADC with 10-channel multiplexing (down to 1.65 V supply), two independent comparators with window mode and wake-up capability, and internal temperature sensor with calibration data stored in system memory. Memory protection covers sector-level Flash/ECC and EEPROM write/erase lock.

Key Specifications

Pinout & Package

TSSOP20 (20-lead, 6.5 × 4.4 mm, 0.65 mm pitch) - RoHS-compliant, ECOPACK®2 certified, optimized for compact PCB layouts in space-constrained modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L011F4P6, the STM32L031F4P6 adds 1 KB EEPROM with ECC and dual comparators - essential for field-deployed devices requiring nonvolatile configuration and analog event detection. Versus STM32L051K8U6, it trades package size and memory headroom for drop-in compatibility in legacy TSSOP20 designs.

Availability

STM32L031F4P6 is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and asset tracking tags requiring stable component supply across extended product lifecycles.

Supply support for STM32L031F4P6 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 components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated analog peripherals, and robust memory integrity - specifically engineered for battery-operated edge devices with multi-year deployment requirements.

FAQ

What is the maximum operating frequency of the STM32L031F4P6?

The STM32L031F4P6 runs at up to 32 MHz using its internal 16 MHz HSI oscillator with PLL multiplication or an external crystal. This frequency is achievable across the full 1.65–3.6 V supply range and –40 to 125 °C temperature span, with dynamic voltage scaling maintaining performance while minimizing current draw in Run mode.

Does the STM32L031F4P6 support hardware encryption or secure boot?

No - the STM32L031F4P6 does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security implementations. For secure firmware updates or data confidentiality, pairing with an external secure element (e.g., STSAFE-A) is recommended per ST's AN4821 guidelines.

Can the STM32L031F4P6 drive 5V logic interfaces directly?

Yes - up to 31 I/Os (including all PAx pins in TSSOP20) are 5V tolerant when configured as inputs, allowing direct connection to 5V UART, I²C, or digital sensors without level shifters. However, output voltage is limited to VDD (max 3.6 V), so external pull-ups to 5V are required for open-drain interfaces like I²C.

Is there a built-in temperature sensor, and how accurate is it?

Yes - the STM32L031F4P6 integrates a calibrated temperature sensor with ±1.5 °C accuracy over –40 to 125 °C. Calibration values are factory-programmed into system memory (addresses 0x1FF8 007A–0x1FF8 007F), enabling software compensation. It draws <1 µA during conversion and is typically used for die temperature monitoring rather than ambient measurement.