STMicroelectronics STM32L4S5AII6

Overview

STM32L4S5AII6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 120 MHz max frequency, 2 MB Flash, 640 KB SRAM, and integrated MIPI DSI Host + LCD-TFT controller for embedded graphical displays. It delivers 150 DMIPS, supports -40 °C to 125 °C operation, and achieves 420 nA Standby with RTC - enabling battery-powered HMI, portable medical devices, and industrial edge nodes requiring high-resolution display and cryptographic security (AES-256/HASH).

For engineers reviewing the STM32L4S5AII6 datasheet, STM32L4S5AII6 pinout, STM32L4S5AII6 application, or STM32L4S5AII6 equivalent, key selection criteria include its dual-bank read-while-write Flash architecture, hardware-accelerated graphics (Chrom-ART/DMA2D), low-power capacitive touch sensing (24 channels), and integrated MIPI D-PHY compliant DSI interface capable of 500 Mbit/s per lane.

Technical Context

This MCU integrates an adaptive real-time accelerator (ART) enabling zero-wait-state execution from Flash at 120 MHz, alongside a multi-AHB interconnect matrix that decouples CPU, DMA, and peripheral bus traffic to sustain deterministic performance under mixed workloads. Its FlexPowerControl architecture implements seven low-power modes - including Shutdown (33 nA), Stop 2 with RTC (2.8 μA), and VBAT mode (305 nA) - managed via dedicated power control registers and hardware event routing.

The device features three independent PLLs (system, USB/audio, ADC), dual Octo-SPI interfaces supporting XIP and memory-mapped execution, and a full suite of security peripherals: true RNG, 96-bit unique ID, firewall, and hardware AES-256/HASH accelerators. Analog subsystem includes two 12-bit DACs, two op-amps with PGA, and a 12-bit 5 Msps ADC with hardware oversampling up to 16-bit resolution.

Key Specifications

Pinout & Package

STM32L4S5AII6 is housed in a 132-pin Ultra-Fine Pitch Ball Grid Array (UFBGA132) package with 0.4 mm ball pitch and 7 mm × 7 mm body size. The package supports thermal dissipation up to 125 °C ambient and is qualified for industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4S5AII6, STM32L4R9AII6 trades display capability for more SRAM in identical packaging, while STM32U575ZIT6 offers superior security and efficiency at the cost of display integration and pin compatibility - making STM32L4S5AII6 optimal for cost-sensitive, display-centric ultra-low-power HMI where legacy design reuse matters.

Availability

STM32L4S5AII6 is available at Aetrix Electronics and suitable for industrial HMI panels, portable medical monitors, smart energy meters, and IoT edge gateways requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STM32L4S5AII6 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 analog products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding rich peripherals, advanced graphics, and cryptographic security - optimized for battery-operated and thermally constrained environments where energy per instruction is critical.

FAQ

What is the maximum operating temperature for STM32L4S5AII6?

The STM32L4S5AII6 is rated for operation from -40 °C to +125 °C ambient temperature, validated per industrial-grade specifications in the DS12024 Rev 4 datasheet. This rating applies to all operating modes including Run, Stop, and Standby, and is supported by thermal characterization data in Section 7.7 of the datasheet.

Does STM32L4S5AII6 support hardware-accelerated graphics rendering?

Yes - it integrates the Chrom-ART Accelerator (DMA2D) for hardware bitmap blending, format conversion, and layer composition, plus Chrom-GRC (GFXMMU) for up to 20% graphic resource optimization. These accelerators operate independently of the CPU and are controlled via dedicated registers mapped in the AHB bus matrix.

Can STM32L4S5AII6 drive a MIPI DSI display directly?

Yes - it includes a fully compliant MIPI DSI Host controller with two D-PHY lanes capable of 500 Mbit/s each, and dedicated pins (PH3–PH7) routed for DSI_CLK and DSI_D0–D3. No external PHY or bridge IC is required for standard DSI display interfacing.

What debug interfaces are supported on STM32L4S5AII6?

The device supports Serial Wire Debug (SWD) and JTAG via dedicated SWCLK, SWDIO, and TMS/TCK pins, along with Embedded Trace Macrocell (ETM) for instruction-level tracing. Debug access remains functional across all low-power modes except Shutdown, and is enabled by default after reset.