STMicroelectronics STM32L4R9ZIY6TR

Overview

STM32L4R9ZIY6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 120 MHz (150 DMIPS), featuring 2 MB Flash, 640 KB SRAM, MIPI DSI Host controller (500 Mbit/s per lane), LCD-TFT controller, and integrated Chrom-ART Accelerator (DMA2D) for embedded graphics applications in portable medical displays and industrial HMIs.

For engineers reviewing the STM32L4R9ZIY6TR datasheet, STM32L4R9ZIY6TR pinout, STM32L4R9ZIY6TR application, or STM32L4R9ZIY6TR equivalent, key selection criteria include dual-bank read-while-write Flash, 125 nA Standby mode with 5 wakeup pins, 24-channel capacitive touch sensing, external SMPS support, and UFBGA144 package compatibility with high-density PCB layouts.

Technical Context

This MCU integrates an adaptive real-time accelerator (ART) enabling zero-wait-state execution from Flash at 120 MHz, alongside a dedicated interconnect matrix that decouples bus arbitration for concurrent peripheral access-critical for simultaneous MIPI DSI video streaming, capacitive touch polling, and USB OTG data transfer.

Its power architecture includes three distinct voltage regulation paths: internal LDO, external SMPS interface, and VBAT backup domain supporting RTC and 32×32-bit registers; low-power modes are hardware-gated with sub-μA wake-up latency (5 µs from Stop mode) and precise brownout reset across all active states.

Key Specifications

Pinout & Package

STM32L4R9ZIY6TR is housed in a 144-ball Ultra-Fine Pitch Ball Grid Array (UFBGA144) package with 0.5 mm ball pitch and 10 mm × 10 mm body size, optimized for compact high-I/O-density designs requiring thermal efficiency and signal integrity in battery-powered applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M4 MCU applications.

Compared with STM32L4R5ZIT6, STM32L4R9ZIY6TR adds MIPI DSI and Chrom-GRC for embedded display systems; versus STM32L4R9VIH6, it delivers higher I/O count and optimized DSI signal integrity in UFBGA144-making it the only option for production-ready, high-resolution portable displays.

Availability

STM32L4R9ZIY6TR is available at Aetrix Electronics and suitable for medical display terminals, industrial HMI panels, smart energy meters, and wearable diagnostic devices requiring stable component supply, long-term lifecycle assurance, and qualified sourcing for Class II medical and industrial certifications.

Supply support for STM32L4R9ZIY6TR 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 semiconductors with ISO 9001 and IATF 16949 certified fabrication.

The STM32L4R series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, advanced graphics, and robust security-designed specifically for battery-operated medical, industrial, and consumer IoT endpoints.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating?

The STM32L4R9ZIY6TR operates at up to 120 MHz with an ART Accelerator-enabled execution, achieving 150 DMIPS (1.25 DMIPS/MHz per Dhrystone 2.1). This performance level is sustained across temperature ranges (–40 °C to +125 °C) and supply voltages (1.71–3.6 V), verified under LDO and external SMPS power configurations per DS12023 Rev 5 Section 3.1.

Does this MCU support external memory expansion, and which interfaces are available?

Yes-STM32L4R9ZIY6TR supports external memory via two independent OctoSPI interfaces (capable of XIP from NOR/PSRAM/FRAM) and a Flexible Static Memory Controller (FSMC) for SRAM, PSRAM, NOR, NAND, and FRAM. These interfaces operate concurrently with internal peripherals, enabling hybrid memory architectures for large GUI assets or firmware overlays without impacting CPU throughput.

How many capacitive sensing channels does the TSC support, and what topologies are enabled?

The built-in Touch Sensing Controller (TSC) supports up to 24 capacitive sensing channels, configurable for self-capacitance (touchkey), mutual-capacitance (matrix keypad), linear slider, and rotary wheel topologies. It includes hardware-accelerated acquisition, spread-spectrum modulation, and noise immunity features-enabling robust touch operation in noisy industrial environments without external components.

What are the key low-power mode current figures, and how is wakeup latency specified?

In Shutdown mode, current draw is 33 nA (5 wakeup pins active); Standby mode consumes 125 nA (same wakeup capability), rising to 420 nA when RTC is enabled. Stop 2 mode draws 2.8 μA with RTC running. Wakeup from Stop mode is guaranteed at ≤5 µs-measured from wakeup event assertion to first instruction fetch-as confirmed in DS12023 Rev 5 Table 4 and Section 6.3.6.