STMicroelectronics STM32L071CBY6TR

Overview

STM32L071CBY6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 128 KB Flash, 20 KB SRAM, 6 KB EEPROM, 12-bit ADC (1.14 Msps), and operating voltage range of 1.65–3.6 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz, supports 5V-tolerant I/Os (78 pins), and targets battery-powered IoT sensors, smart meters, and portable medical devices.

For engineers reviewing the STM32L071CBY6TR datasheet, STM32L071CBY6TR pinout, STM32L071CBY6TR application, or STM32L071CBY6TR equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), 5 µs Flash wakeup time, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L071CBY6TR integrates a Cortex-M0+ core with Memory Protection Unit (MPU), dynamic voltage scaling for power optimization across Run/Sleep/Stop/Standby modes, and a multi-speed internal RC oscillator (65 kHz–4.2 MHz) enabling precise low-power timing without external crystals. Its interconnect matrix routes peripherals-including 4x USART, 6x SPI, and 3x I2C-to memory and DMA independently.

It features dual ultra-low-power comparators with window mode and wake-up capability, a 12-bit ADC with hardware oversampling and analog watchdog, and a dedicated low-power timer (LPTIM) capable of asynchronous operation from LSE/LSI sources-critical for sub-millisecond event detection in energy-constrained systems.

Key Specifications

Pinout & Package

STM32L071CBY6TR uses a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. The package supports reflow soldering and offers thermal performance suitable for industrial ambient temperatures (–40 to +125 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CBY6TR, the STM32L071CBY6TR lacks hardware crypto but matches all power/performance specs - ideal for non-secure sensing. Versus STM32L031K6T6, it delivers 4× more Flash, EEPROM persistence, and richer analog/peripheral integration at modest BOM cost increase.

Availability

STM32L071CBY6TR is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L071CBY6TR 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 automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power applications demanding multi-year battery life, featuring optimized power gating, multiple low-power modes, and integrated analog peripherals - engineered specifically for IoT edge nodes and portable medical devices.

FAQ

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

The STM32L071CBY6TR operates up to 32 MHz with 0.95 DMIPS/MHz performance. At 32 MHz and 3.3 V supply, typical Run mode current is 93 µA/MHz (≈3.0 mA total), measured with code executing from Flash and peripherals active. This value scales linearly with clock frequency and supply voltage per datasheet Table 29.

Does STM32L071CBY6TR support hardware encryption or secure boot features?

No, the STM32L071CBY6TR does not include hardware AES or TRNG engines. Secure boot must be implemented in software using its 96-bit unique ID and ECC-protected Flash/EEPROM for firmware signature verification. For hardware-accelerated cryptography, consider the pin-compatible STM32L072CBY6TR variant.

How many I/O pins are 5V tolerant, and what is the absolute maximum rating?

31 of the 37 general-purpose I/Os on the STM32L071CBY6TR are 5V tolerant (PA0–PA15, PB0–PB15, PC6–PC7, PC13–PC15). Absolute maximum rating for 5V-tolerant pins is VDD + 4 V (up to 7.6 V), verified per datasheet Section 6.3.13. Non-5V-tolerant pins (e.g., VREF+, VBAT) must remain within 1.65–3.6 V.

Can the internal 32.768 kHz LSE oscillator drive the RTC while maintaining accuracy across temperature?

Yes, the LSE oscillator drives the RTC with ±20 ppm initial accuracy and ±10 ppm variation over –40 to +85 °C when paired with PC14/PC15 crystal load capacitors (12.5 pF typical). Calibration via RCC_BDCR register adjusts for aging and temperature drift, achieving ±10 ppm long-term stability as confirmed in datasheet Table 45 and Section 3.6.