STMicroelectronics STM32L4S5QII3P

Overview

STM32L4S5QII3P 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 controller + LCD-TFT controller for embedded graphics applications. It delivers 150 DMIPS, supports -40 °C to 125 °C operation, and achieves 420 nA Stop 2 mode with RTC.

For engineers reviewing the STM32L4S5QII3P datasheet, STM32L4S5QII3P pinout, STM32L4S5QII3P application, or STM32L4S5QII3P equivalent, key selection criteria include ultra-low-power runtime (110 µA/MHz), dual-bank read-while-write Flash, hardware-accelerated graphics (Chrom-ART/DMA2D), AES+HASH crypto engine, and 136 fast I/Os with 5 V tolerance - critical for battery-powered HMI, portable medical displays, and industrial edge nodes requiring secure, high-resolution UI rendering.

Technical Context

The STM32L4S5QII3P integrates an adaptive real-time accelerator (ART) enabling zero-wait-state execution from Flash at 120 MHz, alongside a dedicated interconnect matrix that decouples CPU, DMA, and peripheral bus traffic to sustain throughput under mixed workloads. Its FlexPowerControl architecture implements seven low-power modes - including 33 nA Shutdown and 420 nA Stop 2 - managed via hardware-controlled voltage scaling and clock gating.

Graphics subsystem includes MIPI DSI Host (dual-lane, 500 Mbit/s/lane), Chrom-GRC (GFXMMU) for 20% memory bandwidth optimization, and LTDC supporting RGB888, RGB666, and YUV formats. Analog integration features two 12-bit DACs, two op-amps with PGA, and a 12-bit 5 Msps ADC with hardware oversampling up to 16-bit resolution - all operating from independent supply domains.

Key Specifications

Pinout & Package

STM32L4S5QII3P is housed in a 132-pin UFBGA package (7 × 7 mm, 0.5 mm pitch) with 115 user I/Os, 5 V-tolerant inputs on selected pins, and dedicated power/ground distribution optimized for low-noise analog and high-speed digital operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R9AIY6TR, the STM32L4S5QII3P offers MIPI DSI for compact, high-speed display links; versus STM32U575ZIT6Q, it provides mature DSI support and broader ecosystem tooling, though at higher active current and without TrustZone - making it optimal for cost-sensitive, display-centric legacy-compatible designs.

Availability

STM32L4S5QII3P is available at Aetrix Electronics and suitable for smart medical displays, industrial HMI panels, secure IoT gateways, and battery-powered data loggers requiring stable component supply across long product lifecycles.

Supply support for STM32L4S5QII3P 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 STM32L4S5xx series belongs to ST's ultra-low-power MCU portfolio, engineered specifically for battery-operated and energy-constrained applications demanding high-performance graphics, robust security, and extended runtime - such as portable diagnostics, smart building interfaces, and wireless sensor networks.

FAQ

What is the maximum operating temperature range for STM32L4S5QII3P?

The STM32L4S5QII3P is qualified for industrial and extended temperature operation from -40 °C to +125 °C ambient, verified per JEDEC JESD22-A104. This rating applies across all low-power modes and full peripheral functionality, including MIPI DSI and LCD-TFT controllers, making it suitable for deployment in harsh environments like factory floors and outdoor medical equipment.

Does STM32L4S5QII3P support hardware-accelerated graphics rendering?

Yes - it integrates Chrom-ART Accelerator (DMA2D) for hardware bitmap blending, image rotation, and format conversion, plus Chrom-GRC (GFXMMU) for dynamic memory mapping and frame buffer compression. These accelerators reduce CPU load by up to 70% during GUI rendering and cut external memory bandwidth by 20%, enabling smooth animation on QVGA–XGA displays without external GPU.

Can STM32L4S5QII3P operate from a single-cell Li-ion battery?

Yes - its 1.71 V to 3.6 V supply range accommodates discharged single-cell Li-ion (2.7–4.2 V) and LiPo batteries directly. With Brownout Reset (BOR) active in all modes except Shutdown, and 420 nA Stop 2 current draw, it sustains operation down to ~2.0 V using internal voltage regulation, enabling reliable deep-discharge utilization in portable devices.

How many I/O pins support 5 V tolerance on STM32L4S5QII3P?

Up to 136 fast I/Os are available, and "most" are 5 V-tolerant per ST's DS12024 Rev 4 specification - confirmed for all pins in groups PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15, PF0–PF15, PG0–PG15, PH0–PH15, PI0–PI11, excluding dedicated analog and debug pins. This eliminates level shifters in mixed-voltage systems interfacing with 5 V sensors or logic.