STMicroelectronics STM32L072CZU6

Overview

STM32L072CZU6 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-term operation on coin-cell power.

For engineers reviewing the STM32L072CZU6 datasheet, STM32L072CZU6 pinout, STM32L072CZU6 application, or STM32L072CZU6 equivalent, key selection criteria include standby current (0.29 µA), 5 µs Flash wakeup time, USB crystal-less capability, 125 °C operating temperature, and UFBGA49 package compatibility with high-density PCB layouts.

Technical Context

The STM32L072CZU6 implements a dual-bank Flash architecture with read-while-write capability and hardware ECC for both Flash and EEPROM, enabling robust firmware updates and data logging in field-deployed devices. Its clock system integrates factory-trimmed 16 MHz HSI, self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE for RTC-supporting dynamic voltage scaling across three power ranges (1.65–3.6 V).

Low-power operation is enforced via five hierarchical modes: Run (93 µA/MHz), Sleep, Low-power Run/Sleep, Stop (0.43 µA, 16 wakeup lines), and Standby (0.29 µA, 3 wakeup pins). The interconnect matrix routes peripherals-including USB, multiple USARTs/I2Cs/SPIs, and capacitive touch channels-to GPIOs without CPU intervention, reducing active time and energy per task.

Key Specifications

Pinout & Package

STM32L072CZU6 is housed in a 49-ball Ultra-Fine Pitch Ball Grid Array (UFBGA49) package with 0.4 mm ball pitch, designed for automated assembly and thermal performance in high-density PCBs. Pin mapping follows ST's standardized STM32L072xZ series layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZU6, STM32L073RZT6 adds CAN but sacrifices USB crystal-less operation and increases standby current to 0.35 µA, while STM32L432KCU6 trades ultra-low-power efficiency for Cortex-M4F compute throughput-making the L072 optimal for battery-limited USB-peripheral or sensor-edge roles.

Availability

STM32L072CZU6 is available at Aetrix Electronics and suitable for smart utility meters, wireless sensor nodes, industrial control panels, and medical wearables requiring stable component supply across extended product lifecycles.

Supply support for STM32L072CZU6 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security, and rich analog integration-optimized for IoT endpoints, portable medical devices, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L072CZU6?

The STM32L072CZU6 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. It delivers 0.95 DMIPS per MHz and includes a Memory Protection Unit (MPU) for secure task isolation. The core operates across the full 1.65–3.6 V supply range and supports dynamic voltage scaling to optimize power versus performance in real-time applications.

Does the STM32L072CZU6 support USB without an external crystal?

Yes-the STM32L072CZU6 integrates a self-calibrating 48 MHz HSI48 RC oscillator synchronized to the USB Start-of-Frame (SOF) token, enabling full-speed (12 Mbps) crystal-less USB 2.0 operation. This eliminates the need for an external 48 MHz crystal and associated load capacitors, reducing BOM count and PCB area in portable USB-peripheral designs.

How much EEPROM is available, and is it protected against corruption?

The STM32L072CZU6 includes 6 KB of on-chip data EEPROM with built-in Error-Correcting Code (ECC) protection. Each write/erase cycle is validated by hardware ECC logic, detecting and correcting single-bit errors and detecting multi-bit errors. Sector-level write protection is configurable via option bytes to prevent accidental overwrites during firmware updates.

What are the key low-power modes and their typical current consumption?

The STM32L072CZU6 offers five low-power modes: Run (93 µA/MHz), Sleep (2.3 µA), Low-power Run (11 µA), Stop (0.43 µA with 16 wakeup lines), and Standby (0.29 µA with 3 wakeup pins). In Stop mode with RTC and 20 KB RAM retention, current is 0.86 µA. All modes retain register and SRAM content except Standby, which powers down the entire system except the RTC and backup registers.