STMicroelectronics STM32L452VEI6

Overview

STM32L452VEI6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 512 KB Flash, 160 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DAC, op-amp with PGA, and RTC with hardware calendar. It targets battery-powered industrial sensors, portable medical devices, and smart metering systems requiring sub-µA standby operation and robust mixed-signal capability.

For engineers reviewing the STM32L452VEI6 datasheet, STM32L452VEI6 pinout, STM32L452VEI6 application, or STM32L452VEI6 equivalent, key selection criteria include verified 375 nA Standby+RTC current, SMPS-compatible 36 µA/MHz run mode, 83 GPIOs (most 5 V-tolerant), and full USB 2.0 FS crystal-less support - all confirmed in DS11912 Rev 7.

Technical Context

This MCU implements the Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, paired with a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture integrates dual voltage regulators (LDO/SMPS), brown-out reset (BOR), and five low-power modes - including Stop 2 with 4 µs wakeup and VBAT mode at 145 nA - validated across -40 °C to 125 °C.

The analog subsystem features independent supply domains, a 12-bit ADC with hardware oversampling up to 16-bit effective resolution, two ultra-low-power comparators, and a buffered 2.048 V/2.5 V reference - all specified with 200 µA/Msps ADC power efficiency and ±1% internal 16 MHz RC accuracy.

Key Specifications

Pinout & Package

STM32L452VEI6 is housed in a 100-pin Ultra-Fine-Pitch Ball Grid Array (UFBGA100) package with 0.5 mm pitch and 7 mm × 7 mm body size, optimized for space-constrained portable designs. Pin functions are defined per DS11912 Rev 7 Section 4 (Pinouts and pin description), with dedicated VDD/VSS pairs, multiple VREF+/VREF– inputs, and configurable alternate function mapping across AF0–AF15.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L452VEI6, STM32L476RG trades ultra-low-power optimization for richer peripherals and memory, while STM32L552RE adds security at the cost of 12% higher standby current - making STM32L452VEI6 optimal for battery life–constrained edge nodes where trust anchors are handled externally.

Availability

STM32L452VEI6 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart utility meters, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L452VEI6 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, sensors, and automotive semiconductors.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with STM32L452VEI6 specifically engineered for battery-operated devices needing rich analog integration and long-term RTC reliability.

FAQ

What is the minimum supply voltage for STM32L452VEI6 in Run mode?

The absolute minimum supply voltage is 1.71 V, validated across the full -40 °C to 125 °C operating range. At 1.71 V, core frequency is limited to 24 MHz per DS11912 Rev 7 Table 23; full 80 MHz operation requires ≥1.76 V. The device includes programmable brown-out reset (BOR) thresholds at 1.62 V, 1.8 V, 2.1 V, and 2.4 V.

Does STM32L452VEI6 support external SMPS control, and how is it implemented?

Yes - it supports external SMPS via the VDD12 pin and dedicated control logic. When enabled, the internal regulator bypasses LDO operation, allowing direct connection to an external 1.1 V SMPS output. This reduces active-mode current to 36 µA/MHz (vs. 84 µA/MHz in LDO mode), as measured with code running from Flash and ART Accelerator enabled (DS11912 Rev 7 Table 28).

How many ADC channels does STM32L452VEI6 support, and what is its maximum sampling rate?

It integrates one 12-bit ADC with up to 16 external input channels (plus internal temp sensor and VREFINT). Maximum sampling rate is 5 Msps in single-ended mode with synchronous clocking, achieving 200 µA/Msps efficiency. Hardware oversampling can extend effective resolution to 16 bits at reduced rates (e.g., 12-bit @ 5 Msps → 16-bit @ 312.5 ksps).

Is STM32L452VEI6 pin-compatible with other STM32L4xx variants in UFBGA100?

No - while STM32L452VEI6 shares the UFBGA100 mechanical footprint with STM32L476RG and STM32L496VG, pin functions differ significantly. For example, PA11/PA12 are USB D+/D− on L452 but ETH_REF_CLK/ETH_MDC on L476. Migration requires full schematic and layout revision per DS11912 Rev 7 pin definition tables.