STMicroelectronics STM32L4R9AGI6

Overview

STM32L4R9AGI6 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 + LCD-TFT controller for embedded graphics applications in portable medical devices, industrial HMIs, and battery-powered IoT gateways.

For engineers reviewing the STM32L4R9AGI6 datasheet, STM32L4R9AGI6 pinout, STM32L4R9AGI6 application, or STM32L4R9AGI6 equivalent, key selection criteria include its 33 nA shutdown current, dual-bank read-while-write Flash, Chrom-ART Accelerator (DMA2D), 144-pin UFBGA package with 5 V-tolerant I/Os, and support for external SMPS to achieve 43 µA/MHz active power efficiency.

Technical Context

This MCU implements an adaptive real-time accelerator (ART) enabling zero-wait-state execution from Flash at 120 MHz, paired with a multi-AHB interconnect matrix that decouples CPU, DMA, and peripheral bus arbitration for deterministic latency in mixed-workload applications.

Its low-power architecture integrates three independent voltage domains (VDD, VDDA, VDDIO2), supports batch acquisition mode (BAM) for sensor data pre-processing during low-power states, and features hardware-based graphics acceleration via Chrom-GRC (GFXMMU) for memory-mapped display buffer optimization.

Key Specifications

Pinout & Package

STM32L4R9AGI6 uses a 144-ball ultra-fine-pitch ball grid array (UFBGA144) package with 0.8 mm ball pitch, designed for high-density PCB layouts and thermal performance in fanless industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5VI6, the STM32L4R9AGI6 adds MIPI DSI and doubles Flash capacity - essential for complex GUIs and field-upgradable firmware. Versus STM32H743ZIT6, it trades peak performance for 3.5× lower active power and integrated display control - making it optimal for always-on, battery-constrained HMIs.

Availability

STM32L4R9AGI6 is available at Aetrix Electronics and suitable for portable medical monitors, industrial HMI panels, smart energy gateways, and wearable diagnostic devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L4R9AGI6 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, graphics capability, and long battery life - specifically engineered for intelligent edge devices where energy efficiency and integration density are critical.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32L4R9AGI6 operates at up to 120 MHz using its Arm Cortex-M4 core with FPU. It delivers 150 DMIPS (Dhrystone 2.1) and 409.20 CoreMark® (3.41 CoreMark/MHz), validated under full-speed conditions with ART Accelerator enabled and Flash execution optimized.

Does this MCU support external memory interfaces beyond standard SPI or I²C?

Yes - it integrates two OctoSPI interfaces supporting x1/x2/x4/x8 modes for PSRAM, NOR, NAND, and FRAM, plus a Flexible Static Memory Controller (FSMC) for SRAM, PSRAM, NOR, and NAND. These enable direct connection to high-bandwidth external memories without FPGA or ASIC glue logic.

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

The MIPI DSI Host controller provides two high-speed lanes running at up to 500 Mbit/s each, supporting command/video modes and embedded clock recovery. Unlike parallel RGB, it reduces pin count, EMI, and PCB layer count while enabling higher-resolution displays with lower power than LVDS alternatives.

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

Seven low-power modes are supported: Shutdown (33 nA), Standby (125 nA), Standby with RTC (420 nA), Stop2 with RTC (2.8 µA), and others. The 33 nA Shutdown mode retains RTC and 32×32-bit backup registers - measured at VBAT = 3.3 V and Tj = 25 °C per DS12023 Rev 5.