STMicroelectronics STM32L4R7AII6

Overview

STM32L4R7AII6 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. It supports external SMPS for 43 µA/MHz run-mode efficiency and operates from -40 °C to 125 °C. Used in battery-powered industrial HMIs with color TFT displays and capacitive touch.

For engineers reviewing the STM32L4R7AII6 datasheet, STM32L4R7AII6 pinout, STM32L4R7AII6 application, or STM32L4R7AII6 equivalent, key selection criteria include dual-bank read-while-write Flash, hardware parity-checked SRAM, MIPI DSI lane timing (500 Mbit/s), Chrom-ART Accelerator (DMA2D), and VBAT-supplied RTC with 32×32-bit backup registers.

Technical Context

The device integrates an adaptive real-time memory accelerator (ART Accelerator) enabling zero-wait-state execution from Flash at 120 MHz, and a multi-AHB interconnect matrix supporting concurrent access to Flash, SRAM, and peripherals. Its power architecture includes three low-power modes-Shutdown (33 nA), Standby (125 nA), and Stop 2 with RTC (2.8 µA)-all managed by a dedicated power control block with BOR and voltage scaling.

Graphics subsystem comprises MIPI DSI Host (dual-lane, 500 Mbit/s/lane), LTDC controller with layer blending, Chrom-ART Accelerator (DMA2D) for 2D composition, and Chrom-GRC (GFXMMU) for dynamic graphic memory optimization. Analog subsystem 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.

Key Specifications

Pinout & Package

STM32L4R7AII6 is housed in a 10 × 10 mm UFBGA144 package with 0.5 mm ball pitch, optimized for high-density PCB layouts and thermal performance in compact HMI designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5VI6, STM32L4R7AII6 delivers full display subsystem capability and higher I/O density in the same footprint; versus STM32L4R9VIT6, it offers identical silicon functionality at lower qualification tier-ideal for cost-optimized industrial HMIs where extended documentation isn't mandated.

Availability

STM32L4R7AII6 is available at Aetrix Electronics and suitable for industrial HMIs, portable medical monitors, smart energy meters, and automotive cabin control panels requiring stable component supply across multi-year production cycles.

Supply support for STM32L4R7AII6 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 devices for industrial, automotive, and consumer markets.

The STM32L4R series targets ultra-low-power, high-performance embedded applications demanding rich graphics, secure connectivity, and extended battery life-especially in space-constrained, thermally challenging HMI and IoT edge nodes.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32L4R7AII6 operates at up to 120 MHz using its Arm Cortex-M4 core with FPU. Its performance is quantified at 150 DMIPS (Dhrystone 2.1) and 409.20 CoreMark® (3.41 CoreMark/MHz). The ART Accelerator ensures zero-wait-state execution from Flash memory, maintaining deterministic timing for real-time tasks.

Does STM32L4R7AII6 support external memory expansion, and what interfaces are available?

Yes-it supports external memory via two independent OctoSPI interfaces (up to 133 MHz) and a Flexible Static Memory Controller (FSMC) for SRAM, PSRAM, NOR, NAND, and FRAM. This enables XIP execution and large framebuffer storage, essential for high-resolution GUI applications without relying solely on internal 640 KB SRAM.

How does the MIPI DSI interface differ from traditional RGB or LVDS display interfaces on this MCU?

The MIPI DSI interface provides high-speed, low-power, serialized video transport (dual lanes, 500 Mbit/s each) with embedded clock and error correction-reducing PCB layer count and EMI vs. parallel RGB. Unlike LVDS, it requires no external timing controller and integrates directly with the LTDC, enabling command-mode (register-based) and video-mode (streaming) operation for embedded displays.

What low-power modes are supported, and what is the lowest achievable current draw?

It supports Shutdown (33 nA), Standby (125 nA), Standby with RTC (420 nA), and Stop 2 with RTC (2.8 µA). The 33 nA Shutdown mode retains no RAM content but powers only the reset circuit and five dedicated wakeup pins-ideal for long-term storage or emergency wake-on-event scenarios in battery-critical designs.