STMicroelectronics STM32U073RCI6

Overview

STM32U073RCI6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M0+ 32-bit MCU operating up to 56 MHz, featuring 256-Kbyte flash memory, 40-Kbyte SRAM with hardware parity, USB 2.0 full-speed crystal-less interface, and integrated LCD controller supporting 8×48 segments - deployed in battery-powered medical sensors and portable industrial meters.

For engineers reviewing the STM32U073RCI6 datasheet, STM32U073RCI6 pinout, STM32U073RCI6 application, or STM32U073RCI6 equivalent, key selection criteria include VBAT mode current (130 nA), Stop 2 mode consumption (695 nA without RTC), 12-bit ADC conversion time (0.4 µs), 16-channel capacitive sensing support, and LQFP64 package compatibility with 69 GPIOs (6 wake-up capable).

Technical Context

The device integrates an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, coupled with a dual-regulator power system (MR/LPR) that dynamically selects between main and low-power regulators across Sleep, Stop, and Standby modes. Its analog subsystem uses independent VDDA supply (1.62–3.6 V) for ADC, DAC, OPAMP, and comparators, with hardware oversampling extending effective resolution to 16 bits.

Clock management includes factory-trimmed 16-MHz HSI (±1%), auto-calibrated MSI (±0.25%), and 48-MHz HSI48 with USB clock recovery. Security features comprise Arm PSA Level 1 and SESIP Level 3 candidate certification, 96-bit unique ID, 5 passive anti-tamper pins, and robust RDP with password-based regression (128-bit PSWD).

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant and ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RZT6 and RA2E2A20FJ000, the STM32U073RCI6 uniquely combines crystal-less USB, integrated LCD driver, and sub-1-μA Stop 2 mode - making it the only option among the three suitable for compact, battery-powered displays requiring direct USB firmware updates.

Availability

STM32U073RCI6 is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and asset tracking beacons requiring stable component supply across long-life product cycles.

Supply support for STM32U073RCI6 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 devices for industrial, automotive, and consumer markets.

The STM32U0 series targets ultra-low-power embedded applications demanding extended battery life, integrated peripherals (LCD/USB), and security certifications - specifically optimized for portable instrumentation and certified metering systems.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32U073RCI6 operates at up to 56 MHz in Run mode with LDO regulator enabled, consuming 52 μA/MHz. At full speed, this equates to approximately 2.91 mA total core current, excluding peripheral activity. The ART Accelerator ensures zero wait states from flash, maintaining peak efficiency without external RAM or cache.

Does the device support crystal-less USB, and what are the timing accuracy requirements?

Yes, the STM32U073RCI6 integrates a crystal-less USB 2.0 full-speed PHY with internal 48-MHz HSI48 oscillator and clock recovery circuitry. It achieves ±0.25% accuracy over temperature and voltage, meeting USB specification requirements without external crystal or trimming components - validated per USB-IF test plan DS14548 Section 5.4.3.

How many GPIOs are available in the LQFP64 package, and which are wake-up capable?

The LQFP64 variant provides 69 GPIOs, with six designated as wake-up pins (PA0, PA1, PA2, PA3, PA4, PA5). All 69 pins are 5 V-tolerant except those assigned to analog functions (e.g., ADC inputs, OPAMP pins), enabling direct connection to legacy 5 V logic without level-shifting circuitry.

What LCD configurations does the integrated controller support, and is an external booster required?

The integrated LCD controller supports 8×48 or 4×52 segment configurations with an internal step-up converter, eliminating need for external boost ICs. It operates from VDD (1.71–3.6 V) and generates up to 4.2 V internally - verified for driving standard 3.3 V LCD glass with contrast adjustment via software-controlled voltage steps.