STMicroelectronics STM32L443CCU6

Overview

STM32L443CCU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 256 KB flash, 64 KB SRAM, USB FS, LCD controller, and hardware AES encryption-designed for battery-powered portable medical devices requiring real-time signal processing, secure data handling, and extended runtime.

For engineers reviewing the STM32L443CCU6 datasheet, STM32L443CCU6 pinout, STM32L443CCU6 application, or STM32L443CCU6 equivalent, key selection criteria include its 80 MHz max CPU frequency, 1.0 µA Stop 2 mode current, 12-bit 5 Msps ADC with hardware oversampling, and UFBGA64 (6 × 6 mm) package compatibility with space-constrained wearable designs.

Technical Context

This MCU integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, dual PLLs for independent clock domains (system/USB/audio), and a dedicated interconnect matrix to reduce bus contention between CPU, DMA, and peripherals like SAI and QUADSPI.

Its low-power architecture supports five distinct sleep modes-including Stop 2 (1.0 µA) with RTC and LPUART wake-up-and features a 32-bit backup register bank powered by VBAT, enabling tamper-resistant timekeeping and state retention during main power loss.

Key Specifications

Pinout & Package

STM32L443CCU6 is housed in a 64-ball Ultra-Fine Pitch Ball Grid Array (UFBGA64) package with 0.5 mm ball pitch and 6 × 6 mm body size (package code A019 per ST documentation). It supports 51 general-purpose I/Os, of which up to 42 are 5 V-tolerant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433CCU6, the STM32L443CCU6 adds SAI, LCD, and AES-justifying its use in display-equipped medical devices; versus STM32L552CEU6, it trades TrustZone for lower cost and proven qualification in Class II medical designs, making it optimal for FDA-cleared portable diagnostics.

Availability

STM32L443CCU6 is available at Aetrix Electronics and suitable for portable medical diagnostics, wearable biosensors, and industrial handheld terminals requiring stable component supply across long product lifecycles.

Supply support for STM32L443CCU6 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per microampere, with design emphasis on energy efficiency, integrated analog, and security for battery-operated IoT and medical edge devices.

FAQ

What is the maximum operating temperature range for STM32L443CCU6?

The STM32L443CCU6 is qualified for industrial operation from –40 °C to +105 °C ambient temperature, with full functionality including RTC, ADC, and USB across this range. Its thermal resistance (θ_JA) is 170 °C/W in the UFBGA64 package, requiring minimal PCB copper pour for passive cooling in sealed enclosures.

Does STM32L443CCU6 support USB device mode without an external crystal?

Yes. The STM32L443CCU6 integrates a USB 2.0 Full-Speed crystal-less transceiver with internal clock recovery system (CRS), eliminating the need for a 48 MHz external crystal. This reduces BOM cost and board area while maintaining ±0.25% timing accuracy required for USB enumeration and data transfer.

How many capacitive sensing channels does STM32L443CCU6 support?

The STM32L443CCU6 integrates a hardware touch-sensing controller (TSC) supporting up to 21 capacitive sensing channels, configurable as touchkeys, linear sliders, or rotary wheels. All channels operate independently in Stop mode, enabling wake-up from ultra-low-power states via user interaction without CPU intervention.

Is the 256 KB flash memory organized in single or dual bank?

The 256 KB flash is implemented as a single bank with no dual-bank capability. It supports read-while-write (RWW) only in specific sectors under certain voltage scaling conditions, and includes proprietary code readout protection (RDP) levels to prevent unauthorized firmware extraction-critical for medical device IP protection.