STMicroelectronics STM32L072RZI6

Overview

STM32L072RZI6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM; features USB 2.0 (crystal-less), dual 12-bit DACs, 12-bit ADC (1.14 Msps), and operates from 1.65–3.6 V across –40 to +125 °C - deployed in battery-powered IoT sensor nodes requiring long runtime and analog signal conditioning.

For engineers reviewing the STM32L072RZI6 datasheet, STM32L072RZI6 pinout, STM32L072RZI6 application, or STM32L072RZI6 equivalent, key selection criteria include standby current (0.29 µA), 5 µs Flash wakeup time, USB crystal-less operation, 78 5V-tolerant I/Os, and integrated true RNG with firewall protection.

Technical Context

The STM32L072RZI6 integrates a Cortex-M0+ core with MPU, supporting dynamic voltage scaling and multiple low-power modes: Standby (0.29 µA), Stop + RTC + RAM retention (0.86 µA), and Run mode down to 93 µA/MHz. Its clock system includes factory-trimmed 16 MHz HSI, 48 MHz HSI48 (self-calibrated for USB), 32 kHz LSE for RTC, and PLL for CPU clock generation.

Analog subsystem comprises two buffered 12-bit DACs (operable down to 1.8 V), a 12-bit ADC with up to 16 channels and 1.14 Msps sampling rate (down to 1.65 V), and two ultra-low-power comparators with window mode and wake-up capability. It also supports up to 24 capacitive sensing channels for touch interfaces.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for thermal dissipation in space-constrained industrial and medical PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RZT6, the STM32L072RZI6 saves cost and layout area by omitting unused LCD circuitry; versus STM32L432KCU6, it delivers lower standby current and simpler USB implementation at the expense of floating-point performance - making it ideal for battery-limited, USB-configurable sensor endpoints.

Availability

STM32L072RZI6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial predictive maintenance nodes, and secure asset trackers requiring stable component supply across extended product lifecycles.

Supply support for STM32L072RZI6 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, designing and manufacturing microcontrollers, power ICs, sensors, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications - engineered specifically for battery-operated IoT endpoints where multi-year runtime, analog integration, and security coexist within tight thermal and size constraints.

FAQ

What is the maximum operating frequency and core type of the STM32L072RZI6?

The STM32L072RZI6 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. Its core includes a Memory Protection Unit (MPU) and executes at 0.95 DMIPS/MHz. Frequency scaling is supported via dynamic voltage scaling to optimize power versus performance across operating modes.

Does the STM32L072RZI6 support crystal-less USB, and what accuracy does it achieve?

Yes, the STM32L072RZI6 integrates a self-calibrating 48 MHz HSI48 oscillator synchronized to USB Start-of-Frame (SOF) packets, achieving ±0.25% frequency accuracy - sufficient for full-speed USB 2.0 compliance without an external crystal or trim capacitor.

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

78 I/O pins on the STM32L072RZI6 are 5V tolerant, confirmed across all LQFP64 variants including the RZI6. This tolerance applies regardless of VDD voltage (1.65–3.6 V), enabling direct connection to 5V logic, sensors, or actuators without level-shifting circuitry.

What are the key low-power mode current specifications and wakeup latency?

In Standby mode with 3 wakeup pins active, current is 0.29 µA; in Stop mode with RTC and 20 KB RAM retention, it is 0.86 µA. Wakeup from Flash-based Run mode takes 5 µs - measured from interrupt assertion to first instruction fetch - critical for responsive event-driven sensing.