STMicroelectronics STM32L4Q5CGU6P

Overview

STM32L4Q5CGU6P from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 120 MHz max frequency, 1-MB Flash, 320-KB SRAM, LCD-TFT controller, AES+PKA cryptographic accelerators, and integrated external SMPS support. It operates from 1.71 V to 3.6 V across –40 °C to 125 °C and delivers 150 DMIPS at 41 µA/MHz in SMPS-run mode-targeted for battery-powered industrial HMI, portable medical devices, and smart sensor gateways requiring secure, high-resolution display and low active/standby power.

For engineers reviewing the STM32L4Q5CGU6P datasheet, STM32L4Q5CGU6P pinout, STM32L4Q5CGU6P application, or STM32L4Q5CGU6P equivalent, key selection criteria include its dual-bank read-while-write Flash architecture, 22 nA shutdown current with 5 wakeup pins, 2x 12-bit ADCs (5 Msps), Chrom-ART Accelerator (DMA2D), and hardware-based PKA for ECC key generation-critical for firmware signing and secure boot in resource-constrained edge nodes.

Technical Context

The STM32L4Q5CGU6P integrates an adaptive real-time memory accelerator (ART Accelerator) enabling zero-wait-state execution from Flash at 120 MHz, coupled with a memory protection unit (MPU) for RTOS-safe partitioning. Its FlexPowerControl architecture supports seven low-power modes-including 190 nA standby with RTC and 2.95 µA Stop 2-with brownout reset (BOR) active in all modes except Shutdown.

It features three PLLs (system, USB, audio/ADC), dual Octo-SPI interfaces supporting XIP and memory-mapped execution, and a full interconnect matrix with 14-channel DMA. The analog subsystem includes two independent 12-bit ADCs with hardware oversampling up to 16-bit, two DACs, two op-amps with PGA, and two ultra-low-power comparators-all with independent supply domains for mixed-signal integrity.

Key Specifications

Pinout & Package

STM32L4Q5CGU6P uses the UFQFPN48 package: 7 mm × 7 mm body, 0.5 mm lead pitch, 48 I/O terminals, and an exposed thermal pad for enhanced thermal dissipation in compact industrial and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5ZIT6, the STM32L4Q5CGU6P provides on-die LCD-TFT and PKA at lower pin count and cost-ideal for display-centric secure edge nodes. Versus STM32U575ZIT6, it trades newer security architecture for mature, production-proven display and crypto IP-reducing qualification risk in medical and industrial HMI.

Availability

STM32L4Q5CGU6P is available at Aetrix Electronics and suitable for industrial HMI terminals, portable medical monitors, smart utility meters, and wireless sensor gateways requiring stable component supply, long-term lifecycle assurance, and qualified ultra-low-power performance.

Supply support for STM32L4Q5CGU6P 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 vertical fabrication capability.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, extended battery life, and rich peripheral integration-including secure boot, cryptography, and advanced graphics-across industrial, healthcare, and metering markets.

FAQ

What is the maximum operating temperature for STM32L4Q5CGU6P?

The STM32L4Q5CGU6P is rated for operation from –40 °C to +125 °C ambient temperature, validated per ST's industrial-grade qualification standards (AEC-Q100 not applicable, but qualified to extended temperature range per DS12902 Rev 3 Section 6.3.1). This enables deployment in harsh environments such as motor control enclosures, outdoor utility meters, and under-hood automotive auxiliary systems.

Does STM32L4Q5CGU6P support external SDRAM or PSRAM?

No-STM32L4Q5CGU6P does not integrate a Flexible Static Memory Controller (FSMC) or Octo-SPI in memory-mapped mode for SDRAM/PSRAM. It supports only NOR, NAND, SRAM, and FRAM via FSMC (not present in CGU6P variant), and Octo-SPI in indirect mode for serial flash. External PSRAM attachment requires external logic or a companion bridge IC, as confirmed in Table 2 and Section 3.19 of DS12902 Rev 3.

How many independent ADC instances does STM32L4Q5CGU6P have?

STM32L4Q5CGU6P integrates two independent 12-bit ADCs (ADC1 and ADC2), each capable of 5 Msps sampling rate, hardware oversampling up to 16-bit resolution, and simultaneous injection/regular conversion modes. Both ADCs feature separate prescalers, calibration registers, and dedicated DMA channels-confirmed in Section 3.21 and Table 2 of DS12902 Rev 3.

Is the PKA module in STM32L4Q5CGU6P capable of RSA-2048 operations?

Yes-the Public Key Accelerator (PKA) supports RSA up to 4096 bits, ECC curves including secp256r1 and secp384r1, and modular exponentiation/multiplication. While RSA-2048 is supported, typical use cases emphasize ECC for lower latency and smaller key size; benchmark data in AN5021 shows 12 ms for secp256r1 scalar multiplication at 120 MHz-validated in ST Application Note AN5021 and DS12902 Section 3.34.