STMicroelectronics STM32L071CZY6TR

Overview

STM32L071CZY6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in WLCSP49 package, featuring 192 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation from 1.65 V to 3.6 V across –40 °C to 125 °C. It delivers 0.86 µA Stop mode + RTC + 20-KB RAM retention and supports 4x USART, 3x I2C, and 6x SPI for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L071CZY6TR datasheet, STM32L071CZY6TR pinout, STM32L071CZY6TR application, or STM32L071CZY6TR equivalent, key selection criteria include verified ultra-low-power modes (0.29 µA Standby), WLCSP49 footprint compatibility, ECC-protected memory architecture, and integrated ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L071CZY6TR implements a dual-bank Flash architecture with read-while-write capability and hardware ECC for both Flash and EEPROM, enabling safe firmware updates and data logging in field-deployed devices. Its power management includes five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling supporting CPU frequencies from 32 kHz to 32 MHz.

Timing subsystem integrates multiple clock sources: 1–25 MHz HSE, 32 kHz LSE with RTC calibration, 16 MHz HSI16 (±1%), 37 kHz LSI, and multispeed MSI (65 kHz–4.2 MHz), all feeding a configurable PLL for precise system clock derivation. The 7-channel DMA controller offloads ADC, USART, SPI, and I2C transfers without CPU intervention.

Key Specifications

Pinout & Package

STM32L071CZY6TR uses a 49-ball WLCSP (Wafer-Level Chip-Scale Package) measuring 3.294 × 3.258 mm with 0.4 mm pitch, optimized for space-constrained portable and wearable applications. Ball assignment follows ST's standard WLCSP layout for STM32L071xZ series.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZY6TR, this part omits crypto acceleration but retains full ECC memory protection; versus STM32L031K6T6, it delivers 6× more Flash, EEPROM persistence, and dual ultra-low-power comparators - making it optimal for feature-rich, decade-life edge nodes.

Availability

STM32L071CZY6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking tags requiring stable component supply and long-term manufacturability.

Supply support for STM32L071CZY6TR 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 management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L0 Access line targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and compact packaging - with emphasis on metering, wearables, and industrial IoT endpoints.

FAQ

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

The STM32L071CZY6TR operates up to 32 MHz with 93 µA/MHz typical current draw in Run mode from Flash. At full speed, total active current is approximately 2.98 mA (32 MHz × 93 µA/MHz), verified per DS10690 Rev 7 Table 29 under VDD = 3.3 V, 25 °C conditions.

Does the WLCSP49 package support reflow soldering, and what is the peak temperature limit?

Yes, STM32L071CZY6TR in WLCSP49 is qualified for standard Pb-free reflow per JEDEC J-STD-020. Peak temperature is 260 °C for ≤30 seconds, with ramp rate ≤3 °C/s before and after peak, as specified in ST's package mechanical data document UM1854.

How is the 6 KB EEPROM implemented, and what endurance does it guarantee?

The 6 KB EEPROM is emulated in Flash memory with hardware ECC and wear-leveling logic. ST guarantees 100,000 write/erase cycles and 20-year data retention at 55 °C, validated per DS10690 Rev 7 Section 6.3.9 and Table 52.

Can the ultra-low-power comparators operate independently of the main regulator during Stop mode?

Yes - both comparators remain functional in Stop mode with VDD powered, drawing only 150 nA each (DS10690 Rev 7 Table 67). They support window mode detection and can generate EXTI interrupts to wake the core, enabling autonomous threshold monitoring without CPU activation.