STMicroelectronics STM32C071CBT6N

Overview

STM32C071CBT6N from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller with 128 KB flash, 24 KB SRAM, USB Full-Speed device interface (crystal-less), dual USARTs supporting LIN/IrDA/ISO7816, and 12-bit ADC with up to 19 external channels - deployed in industrial sensor nodes requiring low-power connectivity and secure firmware execution.

For engineers reviewing the STM32C071CBT6N datasheet, STM32C071CBT6N pinout, STM32C071CBT6N application, or STM32C071CBT6N equivalent, key selection criteria include USB FS crystal-less operation, 5 V-tolerant I/Os across 61 pins, -40°C to 125°C extended temperature grade, and hardware parity on SRAM for functional safety-critical firmware.

Technical Context

The STM32C071CBT6N integrates an Arm Cortex-M0+ core with MPU, enabling memory isolation for RTOS-based firmware partitioning. It supports multiple clock sources including 48 MHz HSI48 (±1 %), 32 kHz LSE with calibration, and crystal-less USB timing recovery - eliminating external crystals for cost-sensitive USB peripheral designs.

Its peripheral interconnect uses a multi-layer AHB/APB matrix, allowing concurrent DMA transfers (5-channel controller) to ADC, timers, and communication interfaces without CPU intervention. The device implements boot-from-system-memory and dual-bank flash options for robust over-the-air updates in field-deployed edge devices.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified. Pinout validated per DS14693 Rev 2 Section 4 (Pin assignment and description, Table 12).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32G071CBT6 and STM32F072CBT6, the STM32C071CBT6N uniquely delivers crystal-less USB FS + 125°C operation in LQFP48 - making it the only option for thermally demanding, USB-configurable industrial edge nodes requiring zero external USB timing components.

Availability

STM32C071CBT6N is available at Aetrix Electronics and suitable for industrial sensor nodes, USB human interface devices, motor control edge modules, and smart energy meter interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STM32C071CBT6N 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 STM32C0 series targets cost-optimized, high-reliability industrial and appliance applications - emphasizing extended temperature operation, USB integration without external crystals, and hardware security features for firmware integrity.

FAQ

What is the maximum operating frequency of the STM32C071CBT6N's CPU?

The Arm Cortex-M0+ core operates at up to 48 MHz, verified per DS14693 Rev 2 Section 3.1. This frequency is sustained across the full -40°C to +125°C temperature range with 2.0–3.6 V supply, and is derived from the internal 48 MHz HSI48 oscillator (±1 % accuracy) or external crystal sources.

Does the STM32C071CBT6N support hardware encryption or secure boot features?

Yes - it includes readout protection (RDP) Level 2, a securable flash area, and hardware parity on SRAM. While it lacks dedicated AES engines, its RDP and flash lock bits prevent unauthorized firmware readout, and the securable area enables trusted bootloader storage per IEC 62443-3-3 guidelines.

Can the STM32C071CBT6N operate without an external crystal?

Yes - it supports full crystal-less USB Full-Speed operation using the internal HSI48 oscillator with clock recovery system. For system clocks, the 48 MHz HSI48 (±1 %) and 32 kHz LSI (±5 %) eliminate need for external crystals in non-precision timing applications.

What is the purpose of the separate VDDA/VSSA pins on the STM32C071CBT6N?

VDDA and VSSA provide isolated analog power and ground for the ADC, DAC (if present), and internal voltage reference (VREFINT). This separation minimizes digital switching noise coupling into analog measurements - critical for achieving 12-bit ADC accuracy across temperature and supply variations.