STMicroelectronics STM32L443RCI6TR

Overview

STM32L443RCI6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB flash, 64 KB SRAM, USB FS, LCD controller, and integrated SMPS support. It delivers 36 µA/MHz in SMPS-run mode, 280 nA Standby with RTC, and supports capacitive touch sensing for battery-powered portable instrumentation.

For engineers reviewing the STM32L443RCI6TR datasheet, STM32L443RCI6TR pinout, STM32L443RCI6TR application, or STM32L443RCI6TR equivalent, key selection criteria include ultra-low-power runtime efficiency, integrated LCD driver capability, USB crystal-less operation, and hardware parity-protected SRAM for safety-critical firmware execution.

Technical Context

This MCU implements the Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz. It integrates dual PLLs-one for system clock and one for USB/audio-and supports external SMPS input for optimized power delivery.

The device features a dedicated interconnect matrix for concurrent peripheral access, independent analog supply domains for ADC/DAC/OPAMP, and hardware-accelerated cryptographic primitives including true random number generation and CRC unit. Its low-power architecture includes Batch Acquisition Mode (BAM) and sub-µA Stop/Standby states with multiple wakeup sources.

Key Specifications

Pinout & Package

STM32L443RCI6TR is housed in a 64-ball UFBGA package (6 × 6 mm, 0.4 mm pitch) with 51 user I/Os, all 5 V-tolerant except analog pins. The package supports fine-pitch PCB assembly and thermal performance suitable for compact portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the STM32L443RCI6TR offers superior power efficiency via SMPS interface and smaller UFBGA footprint; versus STM32L476RGT6, it trades flash capacity and Ethernet for integrated LCD and lower static current-making it optimal for compact, display-driven edge devices.

Availability

STM32L443RCI6TR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and wireless sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L443RCI6TR 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, specializing in microcontrollers, power management, and automotive-grade ICs with broad industrial and consumer reach.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog peripherals, and robust security-designed specifically for portable instrumentation, smart meters, and IoT edge nodes.

FAQ

What is the maximum operating frequency and corresponding performance metric?

The STM32L443RCI6TR runs at up to 80 MHz using its Arm Cortex-M4 core with FPU, achieving 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance is sustained with zero-wait-state execution from flash thanks to the ART Accelerator™, confirmed in DS11449 Rev 8 Section 3.2.

Does this MCU support external DC-DC converter integration, and how is it implemented?

Yes-it supports external SMPS via dedicated VDD12 and VDD12_IO pins, enabling direct connection to a buck converter for improved system efficiency. In SMPS mode, active current drops to 36 µA/MHz, verified in Table 27 of DS11449 Rev 8 under VDD12 = 1.10 V conditions.

How many I/O pins are available, and what is their voltage tolerance?

The UFBGA64 package provides 51 general-purpose I/O pins. Of these, the majority are 5 V-tolerant (excluding analog input pins like ADC/DAC/OPAMP channels), allowing direct interfacing with legacy 5 V logic without level shifters-documented in Section 3.12 and Table 15 of the datasheet.

Is hardware-based memory protection included, and what form does it take?

Yes-the device includes a Memory Protection Unit (MPU) supporting eight regions with configurable attributes (read/write/execute permissions, shareability, cacheability). It also features proprietary code readout protection (RDP) levels and firewall logic to isolate secure boot code from application firmware, per Sections 3.3 and 3.6 of DS11449 Rev 8.