STMicroelectronics STM32L031F6P6TR

Overview

STM32L031F6P6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 20-pin TSSOP package, featuring 32 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 1.65–3.6 V across –40 to +125 °C and delivers 76 µA/MHz in Run mode - optimized for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031F6P6TR datasheet, STM32L031F6P6TR pinout, STM32L031F6P6TR application, or STM32L031F6P6TR 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 STM32L031F6P6TR integrates a Cortex-M0+ core 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 calibration, and PLL for CPU clock generation. Its low-power architecture includes five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral availability and current profiles.

Peripheral interconnect is managed via an AHB/APB matrix supporting DMA-driven ADC conversions, UART/I2C/SPI communication, and eight timers including one ultra-low-power LPTIM, two watchdogs (IWDG/WWDG), and SysTick. All memories feature ECC protection, and the 1-KB data EEPROM enables robust parameter storage without external components.

Key Specifications

Pinout & Package

STM32L031F6P6TR uses a 20-pin TSSOP package (6.5 × 4.4 mm, 0.65 mm pitch), compliant with ECOPACK®2 environmental standards. Pin functions are validated per ST's DS10668 Rev 6 datasheet Section 4 (Pin descriptions) and Table 15 (Pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011F4P6TR, the STM32L031F6P6TR adds 1 KB EEPROM and doubles Flash/SRAM - enabling robust parameter storage and richer firmware features without changing PCB layout. Versus STM32L051K8U6TR, it trades package size and memory headroom for lower BOM cost and broader supply voltage support (1.65–3.6 V vs 1.8–3.6 V).

Availability

STM32L031F6P6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial control panels, and portable medical devices requiring stable component supply across long product lifecycles.

Supply support for STM32L031F6P6TR 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 management ICs, MEMS, and analog chips for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby consumption, integrated EEPROM, and robust analog peripherals - specifically engineered for battery-operated edge devices where energy efficiency and data integrity are paramount.

FAQ

What is the maximum operating frequency and core type of the STM32L031F6P6TR?

The STM32L031F6P6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation. It achieves 0.95 DMIPS/MHz performance and supports dynamic voltage scaling to optimize power versus speed. The core includes a single-cycle multiplier, NVIC with 32 interrupts, and full Thumb-2 instruction set compatibility - verified in ST's DS10668 Rev 6 datasheet Section 3.3.

Does the STM32L031F6P6TR support hardware encryption or secure boot?

No, the STM32L031F6P6TR does not include dedicated hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security implementations and external secure elements for advanced authentication. This aligns with its positioning as a cost-optimized ultra-low-power MCU - confirmed in the device summary (Table 1) and functional overview (Section 3) of DS10668 Rev 6.

How many ADC channels and what resolution does the STM32L031F6P6TR provide?

The STM32L031F6P6TR integrates a single 12-bit ADC with up to 10 input channels (PA0–PA7, PB0, PB1), capable of 1.14 Msps sampling rate. It operates down to 1.65 V supply and supports single-ended or differential modes, injected/conversion sequences, and hardware oversampling - detailed in Section 3.11 and Table 57 of DS10668 Rev 6.

Is the STM32L031F6P6TR pin-compatible with other STM32L0x1 variants in TSSOP20?

Yes, the STM32L031F6P6TR shares identical pinout and footprint with STM32L011F4P6TR and STM32L021F4P6TR in the TSSOP20 package. All three support the same VDD/VSS/PAx/NRST/SWDIO/SWCLK/BOOT0 assignments - enabling drop-in replacement within the same voltage and memory constraints, as documented in Table 15 (Pin definitions) of DS10668 Rev 6.