STMicroelectronics STM32L4R5QII6P

Overview

STM32L4R5QII6P from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit microcontroller with FPU, operating up to 120 MHz (150 DMIPS), featuring 2 MB Flash, 640 KB SRAM, MIPI DSI host controller, LCD-TFT controller, and integrated SMPS support. It targets battery-powered HMI, portable medical devices, and industrial edge nodes requiring high-resolution graphics and sub-μA sleep modes.

For engineers reviewing the STM32L4R5QII6P datasheet, STM32L4R5QII6P pinout, STM32L4R5QII6P application, or STM32L4R5QII6P equivalent, key selection criteria include its 33 nA shutdown current, dual-bank read-while-write Flash, Chrom-ART Accelerator (DMA2D), MIPI DSI lane speed (500 Mbit/s), and 14-channel DMA supporting complex sensor fusion and display pipelines.

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 for concurrent peripheral access. Its power architecture includes three low-power modes-Shutdown (33 nA), Standby with RTC (420 nA), and Stop 2 with RTC (2.8 μA)-all supported by brownout reset and VBAT-supplied backup registers.

The analog subsystem features two 12-bit DACs, two op-amps with programmable gain, two ultra-low-power comparators, and a 12-bit 5 Msps ADC with hardware oversampling up to 16-bit resolution. Graphics acceleration is handled by Chrom-ART (DMA2D) and Chrom-GRC (GFXMMU), enabling efficient layer composition and memory bandwidth optimization for TFT displays.

Key Specifications

Pinout & Package

STM32L4R5QII6P uses a UFBGA132 (7 × 7 mm, 0.4 mm pitch) package with 115 I/Os - 136 total pins including power, ground, and dedicated function terminals. The package supports 5 V-tolerant I/Os on most pins and independent I/O supply (down to 1.08 V) on up to 14 pins for interfacing with low-voltage peripherals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M4 MCU applications.

Compared with STM32L4R5QII6P, STM32L4R9VIT6 trades MIPI DSI and memory for lower cost and simpler packaging, while STM32U575ZIT6 prioritizes security and performance over ultra-low-power graphics - making the QII6P uniquely balanced for battery-powered, high-fidelity display applications.

Availability

STM32L4R5QII6P is available at Aetrix Electronics and suitable for portable medical monitors, industrial HMI panels, smart energy meters, and handheld test instruments requiring stable component supply across extended product lifecycles.

Supply support for STM32L4R5QII6P 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 automotive chips since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding rich peripherals, graphics capability, and long battery life - specifically engineered for intelligent edge devices where energy efficiency and integration are critical.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating?

The STM32L4R5QII6P operates at up to 120 MHz with an ART Accelerator enabled, delivering 150 DMIPS at 1.25 DMIPS/MHz (Dhrystone 2.1). This performance level is sustained across temperature (-40 °C to 125 °C) and voltage (1.71–3.6 V) ranges without throttling, verified per DS12023 Rev 5 Section 3.1.

Does this MCU support external memory expansion, and what interfaces are available?

Yes - it integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, NAND, and FRAM, plus two OctoSPI interfaces for high-speed serial flash or RAM. These allow expansion beyond on-chip 2 MB Flash and 640 KB SRAM, with OctoSPI achieving up to 133 MHz clock rate and 8-line x4 data width per interface.

How does the MIPI DSI interface differ from standard LVDS or RGB parallel in terms of design impact?

The MIPI DSI interface reduces pin count (only 4 differential pairs vs. 24+ for RGB), lowers EMI (differential signaling), and simplifies PCB routing (no strict length matching required for short runs). Unlike LVDS, it embeds clock and data in same lanes, eliminating separate pixel clock traces - confirmed in DS12023 Section 3.26 and electrical specs Table 6.3.10.

What are the key power management features that enable sub-microamp operation?

Key features include Shutdown mode (33 nA, 5 wakeup pins), Standby with RTC (420 nA), Stop 2 with RTC (2.8 μA), and Batch Acquisition Mode (BAM) for autonomous peripheral operation. All are validated in DS12023 Section 3.10.4 and Table 4, with brownout reset active in all modes except Shutdown to prevent corruption during voltage droop.