STMicroelectronics STM32L4R9ZIT6

Overview

STM32L4R9ZIT6 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 for embedded graphics applications in portable medical devices, industrial HMIs, and battery-powered smart displays.

For engineers reviewing the STM32L4R9ZIT6 datasheet, STM32L4R9ZIT6 pinout, STM32L4R9ZIT6 application, or STM32L4R9ZIT6 equivalent, key selection criteria include ultra-low-power operation (420 nA Stop 2 with RTC), dual-bank read-while-write Flash, hardware-accelerated graphics (Chrom-ART DMA2D + GFXMMU), and support for external SMPS to achieve 43 µA/MHz active power efficiency.

Technical Context

The STM32L4R9ZIT6 implements an adaptive real-time accelerator (ART) enabling zero-wait-state execution from Flash at 120 MHz, paired with a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its dual OctoSPI interfaces support high-bandwidth external memory expansion (NOR/PSRAM/FRAM), while the MIPI DSI Host controller delivers up to 1 Gbps aggregate bandwidth across two lanes.

Low-power operation is architected via FlexPowerControl: five distinct low-power modes (Shutdown, Standby, Stop 2, etc.) with sub-µA quiescent currents, brownout reset in all active modes, and independent I/O supply down to 1.08 V for mixed-voltage system integration. The integrated SMPS controller enables efficient external DC-DC regulation.

Key Specifications

Pinout & Package

STM32L4R9ZIT6 is housed in a 144-pin LQFP package (20 × 20 mm, 0.5 mm pitch), optimized for manual assembly and thermal management in space-constrained industrial HMI designs. Pin assignments are validated per STMicroelectronics datasheet DS12023 Rev 5, Section 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5ZIT6, the STM32L4R9ZIT6 adds essential MIPI DSI capability for modern display architectures, while STM32U575ZIT6 trades display support for enhanced security and performance - making the L4R9 optimal for cost-sensitive, graphics-intensive, battery-operated HMIs.

Availability

STM32L4R9ZIT6 is available at Aetrix Electronics and suitable for portable medical monitors, industrial HMI panels, and smart energy meter displays requiring stable component supply, long-term lifecycle assurance, and full production traceability.

Supply support for STM32L4R9ZIT6 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 analog components for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding rich peripherals, graphics capability, and extended battery life - specifically engineered for intelligent edge devices where energy efficiency and integration density are paramount.

FAQ

What is the maximum operating frequency and core type of the STM32L4R9ZIT6?

The STM32L4R9ZIT6 features an Arm Cortex-M4 core with FPU, running at up to 120 MHz. It delivers 150 DMIPS performance and supports DSP instructions. This frequency is achievable with the ART Accelerator enabled and external clock sources meeting specification - confirmed in DS12023 Rev 5, Section 3.1.

Does the STM32L4R9ZIT6 support external memory interfaces, and which types are compatible?

Yes, it supports two OctoSPI interfaces and one Flexible Static Memory Controller (FSMC). These support external NOR, PSRAM, NAND, FRAM, and SRAM memories. OctoSPI enables XIP operation up to 133 MHz, while FSMC handles legacy parallel memories - detailed in Sections 3.42 and 3.41 of DS12023 Rev 5.

What display interfaces does the STM32L4R9ZIT6 integrate, and what resolutions are supported?

The device integrates both an MIPI DSI Host controller (2 lanes, up to 500 Mbit/s each) and an LCD-TFT controller (24-bit RGB parallel). It supports common display resolutions including 800×480, 1024×600, and 1280×800 via DSI, and up to UXGA (1600×1200) in limited configurations using LTDC - per electrical characteristics in Section 6.3.34.

How does the STM32L4R9ZIT6 achieve ultra-low-power operation, and what are its lowest current consumption modes?

It achieves ultra-low-power operation through FlexPowerControl architecture, including Shutdown (33 nA), Standby with RTC (420 nA), and Stop 2 with RTC (420 nA). These values are measured at 3.3 V and 25 °C with all clocks gated and backup registers retained - specified in Table 4 and Section 3.10.4 of DS12023 Rev 5.