STMicroelectronics STM32L072CBT6

Overview

STM32L072CBT6 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, 16 channels), and ultra-low-power comparators - deployed in battery-powered IoT sensor nodes requiring long-term operation on coin-cell power.

For engineers reviewing the STM32L072CBT6 datasheet, STM32L072CBT6 pinout, STM32L072CBT6 application, or STM32L072CBT6 equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), USB crystal-less capability, 5V-tolerant I/O count (78 pins), and embedded true RNG for secure firmware updates.

Technical Context

The STM32L072CBT6 implements a dual-bank Flash architecture with read-while-write capability and hardware ECC, enabling safe over-the-air firmware updates without halting execution. Its clock system integrates factory-trimmed 16 MHz HSI (+/-1%), self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE with RTC calibration - supporting precise timekeeping and low-jitter USB signaling without external crystals.

Power management includes five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling across three operating ranges (1.65–3.6 V). Low-power modes are hierarchically structured: Standby (0.29 µA, 3 wakeup pins), Stop (0.43 µA, 16 wakeup lines), and Stop+RTC+20KB RAM retention (0.86 µA), all with sub-5 µs wakeup from Flash.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad - compliant with ECOPACK2 RoHS/REACH requirements and optimized for reflow soldering in high-volume SMT production.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CBT6, STM32L073RBT6 adds CAN and extended temperature range at identical power and pinout, while STM32L432KCU6 trades ultra-low-power efficiency for Cortex-M4F compute capability - making the L072 optimal for energy-constrained sensor endpoints where EEPROM, USB, and sub-µA standby are critical.

Availability

STM32L072CBT6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitoring, and industrial wireless sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L072CBT6 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 analog components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications - specifically engineered for battery-operated devices demanding multi-year operation, secure firmware execution, and rich analog integration without external support components.

FAQ

What is the maximum operating frequency and corresponding power supply range?

The STM32L072CBT6 operates up to 32 MHz across its full 1.65–3.6 V supply range. At 32 MHz, it requires ≥3.0 V for stable operation per datasheet Section 6.3.1; below 3.0 V, maximum frequency scales down to 24 MHz (2.4–2.9 V) and 16 MHz (1.65–2.39 V) via dynamic voltage scaling - ensuring consistent timing margins across battery discharge profiles.

Does the device support hardware encryption acceleration?

No, the STM32L072CBT6 does not include dedicated hardware AES or SHA accelerators. It relies on software libraries (e.g., Mbed TLS) running on the Cortex-M0+ core. However, its true RNG and firewall protection provide foundational security for key generation and memory isolation - sufficient for Class 1 IoT device certifications when combined with secure bootloader practices.

Can the 12-bit DAC outputs drive external loads directly?

Yes, both DAC channels include integrated output buffers rated for ±5 mA sink/source at 1.8–3.6 V supply. They can directly drive low-impedance loads such as op-amp inputs, LED biasing circuits, or piezoelectric actuators - but require external RC filtering for clean analog output when driving cables or noisy environments per AN4234 guidelines.

Is the USB interface fully compliant with USB Battery Charging Specification v1.2?

Yes, the crystal-less USB 2.0 Full-Speed peripheral supports USB Battery Charging Detection (BCD) v1.2, enabling automatic identification of SDP (Standard Downstream Port), CDP (Charging Downstream Port), and DCP (Dedicated Charging Port) - allowing the device to negotiate appropriate charging current (up to 1.5 A) without host enumeration, critical for field programming via USB-C power adapters.