STMicroelectronics STM32L011F4P6

Overview

STM32L011F4P6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in TSSOP20 package, featuring 16 KB Flash, 2 KB SRAM, 512 B 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 requiring sub-1 µA standby current.

For engineers reviewing the STM32L011F4P6 datasheet, STM32L011F4P6 pinout, STM32L011F4P6 application, or STM32L011F4P6 equivalent, key selection criteria include verified 0.23 µA Standby mode (2 wakeup pins), 5 µs Flash wakeup time, 23 I/Os with 5V tolerance, and integrated RTC with 2 KB RAM retention in Stop mode.

Technical Context

The STM32L011F4P6 implements a single-core Arm Cortex-M0+ running at up to 32 MHz, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC calibration, and multispeed MSI (65 kHz–4.2 MHz). Its power architecture includes dynamic voltage scaling and five low-power modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with dedicated BOR, PVD, and POR/PDR blocks.

Analog subsystem integration includes a 10-channel 12-bit ADC operating down to 1.65 V, two independent comparators with window mode and wake-up capability, and internal temperature sensor with calibrated VREFINT. Peripherals are interconnected via a dedicated AHB/APB matrix supporting DMA-driven transfers for ADC, USART, SPI, I2C, and timers without CPU intervention.

Key Specifications

Pinout & Package

TSSOP20 package: 20-pin thin shrink small outline, 5.0 × 4.4 mm body, 0.65 mm pitch, ECOPACK®2 compliant. Designed for compact PCB layouts and automated assembly in space-constrained industrial and consumer modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011F4P6, STM32L031F6P6 offers scalable memory and security for evolving firmware, while EFM32ZG222F32 trades lower integration and higher standby for vendor-specific tooling - making STM32L011F4P6 optimal for cost-sensitive, battery-limited designs needing proven EEPROM and best-in-class ultra-low-power modes.

Availability

STM32L011F4P6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking tags requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and voltage ranges.

Supply support for STM32L011F4P6 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 automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog peripherals, and robustness for battery-operated and industrial edge devices - with STM32L011F4P6 representing the entry-level, cost-optimized variant in this continuum.

FAQ

What is the maximum operating frequency and corresponding power supply range for STM32L011F4P6?

The STM32L011F4P6 achieves its maximum 32 MHz CPU frequency only when VDD is ≥2.4 V, per Section 6.3.1 of the datasheet. At 1.65–2.39 V, the maximum allowed frequency drops to 16 MHz to maintain timing margins and stability. This dynamic voltage scaling is managed automatically by the internal regulator and must be configured in software before changing clock source or frequency.

Does STM32L011F4P6 support hardware encryption or secure boot features?

No, the STM32L011F4P6 does not include hardware AES, SHA, or PKA accelerators, nor does it support secure boot with immutable root-of-trust. These features are present in higher-tier variants like STM32L071 or STM32L082. However, the device does provide a 96-bit unique ID and CRC calculation unit, enabling software-based signature verification and firmware integrity checks when combined with external secure elements or trusted execution environments.

Can the internal 32 kHz LSE oscillator be used for RTC calibration without an external crystal?

No - the LSE (Low-Speed External) oscillator requires connection of a 32.768 kHz quartz crystal between OSC32_IN and OSC32_OUT pins to function. The STM32L011F4P6 does not include a built-in RC-based 32 kHz oscillator; the only internal low-speed source is the 37 kHz LSI, which lacks the stability needed for accurate RTC timekeeping. For RTC applications, an external crystal is mandatory.

How many I/O pins support 5V tolerance, and what are the limitations?

20 of the 23 GPIOs on STM32L011F4P6 are 5V tolerant when VDD is powered (1.65–3.6 V), as confirmed in Table 50 (I/O static characteristics) and Section 3.7 of the datasheet. This tolerance applies only in input or output-push-pull mode with VDD present; 5V-tolerant pins must never be driven high while VDD = 0 V, and analog functions (ADC, comparators) remain limited to VDD-referenced operation regardless of pin voltage rating.