STMicroelectronics STM32L4R9VIT6

Overview

STM32L4R9VIT6 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 delivers 150 DMIPS and supports advanced graphics via Chrom-ART Accelerator (DMA2D) and Chrom-GRC (GFXMMU), targeting high-resolution embedded displays in battery-constrained industrial HMI and portable medical devices.

For engineers reviewing the STM32L4R9VIT6 datasheet, STM32L4R9VIT6 pinout, STM32L4R9VIT6 application, or STM32L4R9VIT6 equivalent, key selection criteria include its dual-bank read-while-write Flash architecture, 43 µA/MHz SMPS-powered Run mode, 24-channel capacitive touch sensing, hardware parity-protected SRAM, and support for external OctoSPI and FSMC memories - all critical for real-time GUI, low-power connectivity, and secure firmware updates.

Technical Context

The device integrates an adaptive real-time accelerator (ART Accelerator) 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 power architecture includes three independent voltage domains (VDD, VDDA, VDDIO2) supporting 1.08–3.6 V operation and flexible SMPS/LDO selection.

Graphics subsystems are hardware-accelerated: the MIPI DSI Host controller supports two lanes at up to 500 Mbit/s each, while the LTDC (LCD-TFT controller) drives RGB interfaces up to 24-bit color depth. The Chrom-GRC (GFXMMU) enables dynamic memory mapping for efficient frame buffer management and up to 20% reduction in graphic resource footprint.

Key Specifications

Pinout & Package

STM32L4R9VIT6 is housed in a 100-pin LQFP package (14 × 14 mm, 0.5 mm pitch), optimized for manual assembly and thermal reliability in industrial environments. Pin assignments follow ST's standard STM32L4R9xx pinout layout with dedicated VDD/VSS pairs per power domain, separate analog and digital ground planes, and configurable I/O banks supporting independent 1.08–3.6 V supply (VDDIO2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5VIT6, the STM32L4R9VIT6 adds display-specific hardware at minimal power penalty; versus STM32U575ZIT6, it trades TrustZone for proven MIPI DSI maturity and lower active power in graphics-intensive use cases.

Availability

STM32L4R9VIT6 is available at Aetrix Electronics and suitable for industrial HMI, portable medical devices, smart energy meters, and wireless gateway nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L4R9VIT6 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 automotive-grade components since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding rich peripherals, graphical capability, and long battery life - specifically engineered for intelligent edge devices where energy efficiency and human-machine interaction converge.

FAQ

What is the maximum operating temperature range for STM32L4R9VIT6?

The STM32L4R9VIT6 is qualified for industrial operation from –40 °C to +85 °C ambient temperature. Its extended temperature grade supports reliable performance in enclosed enclosures, outdoor kiosks, and medical equipment without forced cooling - validated per JEDEC JESD22-A108F and ST's internal thermal cycling tests.

Does STM32L4R9VIT6 support external memory interfaces beyond OctoSPI?

Yes - it integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, NAND, and FRAM with 8-/16-bit data bus widths and programmable timing. This allows direct connection to legacy parallel memories, complementing OctoSPI for serial flash/PSRAM, enabling hybrid memory architectures for large UI assets or firmware overlays.

How does the Chrom-GRC (GFXMMU) improve display performance?

The Chrom-GRC implements a graphics memory management unit that dynamically remaps frame buffers and texture assets in SRAM, reducing memory bandwidth pressure by up to 20%. It enables partial screen updates, double-buffering with zero-copy switching, and efficient alpha blending - all without CPU intervention, lowering average power during GUI animation by 35% compared to software-only rendering.

Can STM32L4R9VIT6 achieve 120 MHz operation using only internal clock sources?

Yes - its internal multispeed oscillator (MSI), auto-trimmed by the 32 kHz LSE crystal, achieves better than ±0.25% accuracy across temperature and voltage. When configured as the PLL input, MSI enables full 120 MHz system clock without external high-frequency crystals, reducing BOM cost and board space while maintaining timing compliance for USB and MIPI DSI link training.