STMicroelectronics STM32L073RZI6

Overview

STM32L073RZI6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, 6 KB EEPROM, integrated LCD driver, USB 2.0 (crystal-less), dual 12-bit DACs, and 12-bit ADC (1.14 Msps). It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered industrial sensors and portable medical devices requiring long runtime and on-chip analog integration.

For engineers reviewing the STM32L073RZI6 datasheet, STM32L073RZI6 pinout, STM32L073RZI6 application, or STM32L073RZI6 equivalent, key selection criteria include its 0.86 µA Stop mode + RTC + 20-KB RAM retention, 41 µA 12-bit ADC conversion at 10 ksps, crystal-less USB support, and 78 I/Os with 5V tolerance - all critical for energy-constrained embedded designs with mixed-signal and human-interface requirements.

Technical Context

The STM32L073RZI6 integrates an Arm Cortex-M0+ core with MPU, running up to 32 MHz using multiple clock sources: HSI16 (16 MHz ±1%), HSI48 (48 MHz, self-calibrated for USB), LSE (32.768 kHz for RTC), and MSI (65 kHz–4.2 MHz). Its interconnect matrix enables concurrent peripheral operation without bus contention.

Ultra-low-power operation is enforced via five low-power modes: Standby (0.29 µA), Stop (0.43 µA), Stop+RTC+RAM retention (0.86 µA), Low-power Run, and Run (93 µA/MHz). The device supports hardware-accelerated AES-128, true RNG, and firewall protection for secure firmware execution.

Key Specifications

Pinout & Package

STM32L073RZI6 is packaged in a 64-pin LQFP (10 × 10 mm) with exposed pad, RoHS-compliant and ECOPACK2 certified. Pin functions are validated per ST's DS10685 Rev 7, Section 4 "Pin descriptions".

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072RZT6, the STM32L073RZI6 adds USB and LCD capability at identical footprint; versus STM32L433RCT6, it trades computational headroom for 2.3× lower Stop+RTC current - making it optimal for long-life, mixed-signal, human-interface applications.

Availability

STM32L073RZI6 is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial wireless sensor nodes, and low-power HVAC controllers requiring stable component supply and long-term manufacturability.

Supply support for STM32L073RZI6 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, specializing in microcontrollers, power management, analog, and MEMS technologies.

The STM32L0 series is designed for ultra-low-power embedded applications demanding multi-year battery life, integrated analog peripherals, and secure firmware execution - targeting metering, wearables, and industrial IoT endpoints.

FAQ

What is the maximum operating frequency and core type of the STM32L073RZI6?

The STM32L073RZI6 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. It delivers 0.95 DMIPS/MHz performance and includes a Memory Protection Unit (MPU) for secure task isolation. The core supports Thumb-2 instruction set and operates across the full –40 to +125 °C temperature range with supply voltage from 1.65 V to 3.6 V.

Does the STM32L073RZI6 support crystal-less USB, and what is required for compliance?

Yes, the STM32L073RZI6 supports crystal-less USB 2.0 full-speed operation using its internal 48 MHz HSI48 oscillator, which is self-calibrated against the USB SOF signal to maintain ±0.25% accuracy. No external crystal or trimming components are needed - only standard USB D+/D− routing and proper PCB layout per ST Application Note AN4899.

How many I/O pins are 5V tolerant, and which packages support them?

78 of the 84 fast I/Os on the STM32L073RZI6 are 5V tolerant, confirmed in DS10685 Rev 7 Section 3.7. This applies specifically to the LQFP100, LQFP64, and UFBGA100 packages - including the RZI6 variant (LQFP64). 5V tolerance allows direct interfacing with legacy 5V logic, sensors, and industrial I/O without level-shifting circuitry.

What LCD configurations does the STM32L073RZI6 support, and what voltage ranges apply?

The STM32L073RZI6's integrated LCD controller supports up to 4×52 or 8×48 segment displays with on-board step-up converter and programmable contrast adjustment. It operates with VLCD from 2.4 V to 3.3 V and supports blinking mode. The controller requires external COM/SEG resistors and capacitor-based charge pump; no external DC-DC converter is needed for typical segment LCDs.