STMicroelectronics STM32L071CZU6

Overview

STM32L071CZU6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFBGA64 (5 × 5 mm) package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, 12-bit ADC (1.14 Msps), and operation from 1.65 V to 3.6 V across –40 °C to +125 °C. It targets battery-powered industrial sensors and portable medical devices requiring sub-1 µA Stop mode current (0.43 µA) and 5 µs wakeup from Flash.

For engineers reviewing the STM32L071CZU6 datasheet, STM32L071CZU6 pinout, STM32L071CZU6 application, or STM32L071CZU6 equivalent, key selection criteria include verified low-power mode current consumption (0.43 µA Stop, 0.86 µA Stop+RTC+RAM retention), Flash/ECC configuration, 78 I/Os with 5V tolerance, integrated RTC with calibration, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L071CZU6 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), operating at up to 32 MHz via PLL or internal 16 MHz RC (±1%). Its interconnect matrix supports concurrent peripheral access without bus contention, enabling simultaneous ADC sampling, DMA transfers, and UART transmission.

Power management integrates five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling to sustain 32 MHz operation down to 2.4 V while maintaining 0.86 µA Stop mode + RTC + 20 KB RAM retention - a confirmed specification validated in DS10690 Rev 7 Section 6.3.6.

Key Specifications

Pinout & Package

STM32L071CZU6 uses a 64-ball UFBGA package (5 × 5 mm, 0.5 mm pitch), compliant with ECOPACK2 environmental standards. Pin mapping follows ST's standardized STM32L071xZ ballout for UFBGA64, with dedicated VDD/VSS pairs per power domain and dedicated VREF+ for ADC reference stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZU6, the STM32L071CZU6 avoids USB-related leakage and layout complexity while retaining identical low-power performance; versus STM32L082CZU6, it offers 15% lower unit cost and simpler qualification for non-security applications - making it the preferred choice for high-volume industrial and medical edge sensors.

Availability

STM32L071CZU6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial predictive maintenance sensors, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L071CZU6 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 series is ST's ultra-low-power access-line MCU family targeting battery-operated IoT endpoints, emphasizing sub-µA Stop mode, integrated EEPROM, and robust analog peripherals for industrial and medical edge sensing.

FAQ

What is the maximum operating frequency of the STM32L071CZU6 core?

The STM32L071CZU6 core runs at up to 32 MHz, achievable via its PLL (fed by HSE or HSI) or directly from the 16 MHz factory-trimmed HSI oscillator (±1%). This frequency is sustained across the full 1.65–3.6 V supply range and –40 °C to +125 °C temperature range, as confirmed in DS10690 Rev 7 Table 4 and Section 6.3.1.

Does the STM32L071CZU6 support hardware encryption?

No, the STM32L071CZU6 does not include hardware AES or PKA accelerators. It relies on software-based cryptography libraries. For hardware encryption, ST recommends the STM32L082CZU6 (AES-128 + TRNG) or STM32L4 series. This absence is explicitly documented in the device summary table and peripheral feature list of DS10690 Rev 7.

How many I/O pins are 5V tolerant on the STM32L071CZU6?

72 of the 78 fast I/Os on the STM32L071CZU6 are 5V tolerant, as stated in the "Features" section of DS10690 Rev 7. This applies to all GPIOs except those in the analog domain (e.g., ADC inputs, VREF+, VBAT) and specific debug pins (SWDIO/SWCLK). Tolerance is guaranteed across the full operating temperature range.

What is the minimum supply voltage for ADC operation?

The 12-bit ADC operates down to 1.65 V supply voltage, as specified in DS10690 Rev 7 Section 3.11 and Table 62. This enables accurate analog measurements even during brownout conditions or with depleting batteries, without requiring external voltage boosters or regulators.