STMicroelectronics STM32L071CZT7

Overview

STM32L071CZT7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP48 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 delivers 0.95 DMIPS/MHz performance and supports industrial sensor nodes requiring long battery life and robust analog integration.

For engineers reviewing the STM32L071CZT7 datasheet, STM32L071CZT7 pinout, STM32L071CZT7 application, or STM32L071CZT7 equivalent, key selection criteria include standby current (0.29 µA), RTC+RAM retention in Stop mode (0.86 µA), 78 I/Os (5V-tolerant), dual ultra-low-power comparators, and integrated bootloader supporting USART/I²C/SPI.

Technical Context

The STM32L071CZT7 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), operating at up to 32 MHz via internal 16 MHz RC (±1%) or external crystal (1–25 MHz). Its power architecture includes five low-power modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with dedicated voltage regulators and brownout reset (BOR) with five selectable thresholds.

Analog subsystem integration includes a 12-bit ADC with 16-channel multiplexing, two independent ultra-low-power comparators (operable down to 1.65 V), temperature sensor, and internal voltage reference (VREFINT). Digital peripherals include 4x USART (2 ISO 7816/IrDA-capable), 1x LPUART, up to 6x SPI (16 Mbit/s), 3x I²C (2 SMBus/PMBus), 11 timers (including ultra-low-power LPTIM), and 7-channel DMA supporting concurrent peripheral transfers.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch), ECOPACK2-compliant, with exposed thermal pad. Pin count matches package footprint; all signals mapped per ST's official pin definition table (DS10690 Rev 7, Table 15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZT7 and STM32L073CZT7, the STM32L071CZT7 provides optimal balance of ultra-low-power operation, integrated analog, and cost efficiency for non-crypto, non-CAN applications-making it ideal for high-volume battery-powered edge devices where feature minimization reduces validation scope and BOM cost.

Availability

STM32L071CZT7 is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and asset tracking tags requiring stable component supply across multi-year production cycles.

Supply support for STM32L071CZT7 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, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and secure firmware execution-optimized for IoT endpoints, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and associated power consumption in Run mode?

The STM32L071CZT7 operates up to 32 MHz using internal or external clock sources. At 32 MHz with code executing from Flash, typical current consumption is 93 µA/MHz (≈2.98 mA total), measured at 3.0 V and 25 °C per DS10690 Rev 7, Table 29. Dynamic voltage scaling adjusts core voltage to minimize active power across frequency ranges.

Does STM32L071CZT7 support hardware encryption or secure boot features?

No. The STM32L071CZT7 does not include hardware AES, DES, or TRNG blocks. Secure boot must be implemented in software using stored keys and signature verification. For hardware-accelerated cryptography, ST recommends the STM32L072CZT7 (AES-128 + TRNG) or STM32L4 series.

How many I/O pins are available in the LQFP48 package, and which are 5V-tolerant?

The LQFP48 package provides 37 general-purpose I/O pins (PA0–PA15, PB0–PB15, PC13–PC15, PD2). Of these, 37 pins are 5V-tolerant per datasheet Section 6.3.13 - enabling direct interfacing with 5V peripherals without level-shifting circuitry.

Can the internal 32 kHz LSE oscillator be calibrated, and what is its accuracy after calibration?

Yes. The LSE oscillator supports digital calibration via the RCC_BDCR register (bit LSECAL[4:0]). Factory-trimmed accuracy is ±20 ppm at 25 °C; post-calibration, typical accuracy improves to ±5 ppm across –40 °C to +85 °C, sufficient for metering-grade RTC applications per DS10690 Rev 7, Section 6.3.6.