STMicroelectronics STM32L4R5QGI6STR

Overview

STM32L4R5QGI6STR 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 external SMPS for 43 µA/MHz run-mode efficiency. Used in battery-powered industrial HMIs requiring high-resolution graphics and real-time sensor fusion.

For engineers reviewing the STM32L4R5QGI6STR datasheet, STM32L4R5QGI6STR pinout, STM32L4R5QGI6STR application, or STM32L4R5QGI6STR equivalent, key selection criteria include its dual-bank read-while-write Flash, Chrom-ART Accelerator (DMA2D), 24-channel capacitive touch sensing, ULPMark™CP score of 233, and UFBGA132 package with 100 I/Os (most 5 V-tolerant).

Technical Context

The device integrates an adaptive real-time accelerator (ART) enabling zero-wait-state execution from Flash at 120 MHz, and features a multi-AHB interconnect matrix supporting concurrent access to Flash, SRAM, and peripherals. Its power architecture includes three low-power modes-Stop 2 (2.8 µA with RTC), Standby (125 nA), and Shutdown (33 nA)-with brownout reset active in all except shutdown.

Graphics acceleration is handled by the Chrom-ART Accelerator (DMA2D) and Chrom-GRC (GFXMMU), enabling hardware-accelerated 2D composition and up to 20% graphic resource optimization. The MIPI DSI Host supports two lanes at 500 Mbit/s each, directly driving display modules without external bridge ICs.

Key Specifications

Pinout & Package

STM32L4R5QGI6STR uses the UFBGA132 (7 × 7 mm, 0.5 mm pitch) package with 100 user I/Os, 13 power/ground pins, and dedicated debug (SWD/JTAG), reset, and clock pins. Pin functions support flexible peripheral remapping via alternate function registers AF0–AF15.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5QGI6STR, the STM32L4R5VIT6 sacrifices DSI/LTDC for cost and footprint savings, while the STM32U575ZIT6 trades integrated graphics for security and energy efficiency-neither offers pin- or firmware-compatible replacement without hardware and software redesign.

Availability

STM32L4R5QGI6STR is available at Aetrix Electronics and suitable for industrial HMIs, portable medical devices, smart energy meters, and asset tracking gateways requiring stable component supply across multi-year production cycles.

Supply support for STM32L4R5QGI6STR 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 products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding rich peripherals, graphics capability, and long battery life-specifically optimized for intelligent displays, portable instrumentation, and energy-conscious IoT endpoints.

FAQ

What is the maximum operating temperature range for STM32L4R5QGI6STR?

The STM32L4R5QGI6STR is rated for operation from –40 °C to +125 °C ambient temperature. This extended industrial grade rating is validated per ST's production test flow and applies to all UFBGA132 variants in the L4R5xx family, enabling deployment in harsh environments such as motor control cabinets and outdoor utility meters.

Does STM32L4R5QGI6STR support hardware encryption?

No, STM32L4R5QGI6STR does not integrate AES, PKA, or TRNG-based cryptographic accelerators. It includes a true random number generator (RNG) and CRC unit, but lacks dedicated crypto engines. For hardware encryption, ST recommends the STM32L5 or STM32U5 series, which feature AES-256, PKA, and secure key storage.

Can the MIPI DSI interface drive a 1080p display?

Yes-the dual-lane MIPI DSI interface supports up to 1 Gbit/s aggregate bandwidth (500 Mbit/s per lane), sufficient for 720p60 or 1080p30 RGB888 output depending on display timing and PHY tuning. Achieving 1080p requires careful PCB layout (controlled impedance, length matching) and validation against the target panel's DSI timing specifications.

Is external memory required for typical HMI applications?

No-on-chip resources are sufficient for most HMI use cases: 2 MB Flash stores firmware + compressed assets; 640 KB SRAM accommodates frame buffers (e.g., 800×480×2 bytes = 768 KB exceeds SRAM, but Chrom-ART DMA2D enables partial buffer rendering). External OctoSPI flash may be added only for large font/image libraries or firmware rollback storage.