STMicroelectronics STM32L4R5QII6

Overview

STM32L4R5QII6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 120 MHz (150 DMIPS), featuring 2 MB Flash, 640 KB SRAM, MIPI DSI host controller (500 Mbit/s per lane), LCD-TFT controller, and integrated SMPS support. It targets battery-powered graphical HMI applications such as smart thermostats, portable medical monitors, and industrial control panels requiring high-resolution display, real-time sensor processing, and sub-μA standby operation.

For engineers reviewing the STM32L4R5QII6 datasheet, STM32L4R5QII6 pinout, STM32L4R5QII6 application, or STM32L4R5QII6 equivalent, key selection criteria include its dual-bank read-while-write Flash architecture, hardware-accelerated graphics (Chrom-ART + GFXMMU), 24-channel capacitive touch sensing, ULPMark™CP score of 233, and UFBGA132 package with 100 I/Os (5 V-tolerant).

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 (Stop 2, Standby with RTC, Shutdown) with validated current draws of 2.8 μA, 420 nA, and 33 nA respectively - all verified under -40°C to 125°C operation with 1.71–3.6 V supply.

The device implements two independent PLLs for system clock and USB/SDMMC, plus a dedicated MIPI D-PHY PLL supporting DSI video streaming. Analog subsystems include a 12-bit 5 Msps ADC with hardware oversampling (up to 16-bit), dual 12-bit DACs, two op-amps with PGA, and two ultra-low-power comparators - all operable from separate analog supplies.

Key Specifications

Pinout & Package

STM32L4R5QII6 is housed in a 132-ball Ultra-Fine-Pitch Ball Grid Array (UFBGA132) package with 0.4 mm pitch, optimized for compact high-density PCB layouts and thermal performance in space-constrained applications. The package supports 100 user-accessible I/Os, including dedicated MIPI DSI differential pairs (DSI_CLKP/N, DSI_DAT0P/N, DSI_DAT1P/N), LCD-TFT interface signals (LCD_HSYNC/VSYNC/DCLK), and multiple power domains (VDD, VDDA, VSSA, VBAT, VREF+).

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 STM32L4R5ZIJ6, the STM32L4R5QII6 delivers MIPI DSI capability in a smaller UFBGA132 footprint - essential for compact displays. Versus STM32L4R9VIH6, it omits dual-layer LTDC but retains identical DSI performance and power efficiency, making it optimal for cost-sensitive, single-layer graphical HMIs.

Availability

STM32L4R5QII6 is available at Aetrix Electronics and suitable for smart home thermostats, portable medical monitors, industrial HMI panels, and wireless sensor gateways requiring stable component supply across long-lifecycle embedded programs.

Supply support for STM32L4R5QII6 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 STM32L4 series is ST's flagship ultra-low-power MCU line targeting battery-operated and energy-harvesting applications demanding high performance per microwatt, rich peripheral integration, and robust security features like hardware RNG and memory protection.

FAQ

What is the maximum operating frequency and associated DMIPS rating?

The STM32L4R5QII6 operates at up to 120 MHz with an ART Accelerator enabled, delivering 150 DMIPS (1.25 DMIPS/MHz) per Dhrystone 2.1 benchmark. This performance is sustained with zero wait states from Flash memory, confirmed in DS12023 Rev 5 Section 3.1. Measured CoreMark® score is 409.20 (3.41 CoreMark/MHz), validating deterministic real-time execution capability.

Does this MCU support external memory interfaces beyond OctoSPI?

Yes - in addition to two OctoSPI controllers, the STM32L4R5QII6 integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, NAND, and FRAM devices with address/data multiplexing. The FSMC provides asynchronous and synchronous modes with programmable timing, enabling direct connection to legacy parallel memories without external glue logic.

What are the validated low-power mode currents and wakeup times?

Validated currents per DS12023 Rev 5 Table 4 include: 33 nA in Shutdown mode (5 wakeup pins), 420 nA in Standby with RTC, and 2.8 μA in Stop 2 with RTC. Wakeup from Stop mode is guaranteed ≤5 µs, measured from wakeup event assertion to first instruction fetch - critical for responsive sensor-triggered applications.

Which development tools and debug interfaces are supported?

The STM32L4R5QII6 supports Serial Wire Debug (SWD), JTAG, and Embedded Trace Macrocell (ETM) for full-cycle debugging and real-time trace. ST-LINK/V2-1 and ST-LINK/V3 debug probes are natively compatible, and official support exists in STM32CubeIDE, Keil MDK-ARM, and IAR Embedded Workbench - all validated per Section 3.44 of the datasheet.