STMicroelectronics STM32L072KZU7

Overview

STM32L072KZU7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM with ECC; integrated USB 2.0 (crystal-less), dual 12-bit DACs, 12-bit ADC (1.14 Msps), and ultra-low-power comparators; deployed in battery-powered IoT sensor nodes requiring long runtime and precise analog signal conditioning.

For engineers reviewing the STM32L072KZU7 datasheet, STM32L072KZU7 pinout, STM32L072KZU7 application, or STM32L072KZU7 equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), USB crystal-less operation, 5V-tolerant I/O count (78 pins), and embedded true RNG for secure firmware updates.

Technical Context

The STM32L072KZU7 implements a dual-bank Flash architecture with read-while-write capability and ECC protection, enabling safe over-the-air firmware updates without halting execution. Its clock system integrates factory-trimmed 16 MHz HSI (+/-1%), self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE with RTC calibration - supporting precise timekeeping and low-jitter USB signaling without external crystals.

Power management includes five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling across Run, Sleep, Stop, and Standby modes. The ultra-low-power comparators operate down to 1.65 V with window mode and wake-up capability, while the 24-channel capacitive sensing controller supports touchkey and rotary interface design without external components.

Key Specifications

Pinout & Package

STM32L072KZU7 is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per STMicroelectronics datasheet DS10689 Rev 5, Section 4 (Pin descriptions), Table 16.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072KZU7, STM32L073RZT6 adds CAN FD at the cost of larger package and no USB crystal-less advantage, while STM32L083RZT6 enhances security and buffer capacity but increases BOM cost - both retain identical ultra-low-power behavior and analog peripheral set.

Availability

STM32L072KZU7 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless nodes, and secure firmware update modules requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L072KZU7 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 ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, secure firmware execution, and rich analog integration - optimized for IoT edge nodes, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L072KZU7?

The STM32L072KZU7 features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz. It supports dynamic voltage scaling to maintain performance across supply ranges (1.65–3.6 V) and includes a Memory Protection Unit (MPU) for task isolation in RTOS environments.

Does the STM32L072KZU7 support USB without an external crystal?

Yes - it integrates a self-calibrating 48 MHz HSI48 oscillator trimmed to ±0.25% accuracy, enabling full-speed USB 2.0 (12 Mbps) operation without external crystal or capacitor. This reduces BOM cost and PCB area while maintaining USB compliance for enumeration and data transfer.

How many I/O pins are 5V tolerant, and what is the standby current?

78 of the 84 fast I/Os are 5V tolerant, allowing direct connection to 5V logic and sensors. Standby mode current is 0.29 µA with three wakeup pins enabled, measured at 3.0 V and 25 °C per DS10689 Rev 5, Table 38 - enabling decade-long battery life in infrequently active sensor nodes.

What analog peripherals are integrated, and what are their key operating limits?

The device integrates a 12-bit ADC (1.14 Msps, 16 channels, functional down to 1.65 V), two 12-bit buffered DACs (operational down to 1.8 V), and two ultra-low-power comparators (window mode, wake-up capable, down to 1.65 V). All analog blocks retain functionality across the full 1.65–3.6 V supply range.