STMicroelectronics STM32F071CBU7

Overview

STM32F071CBU7 from STMicroelectronics is a 32-bit Arm® Cortex®-M0 microcontroller in UFQFPN48 package, operating up to 48 MHz with 128 KB Flash, 16 KB SRAM (HW parity), and integrated peripherals including 12-bit ADC (16-channel, 1.0 µs), dual 12-bit DAC, two analog comparators, and capacitive touch sensing - deployed in industrial HMI panels, smart sensor nodes, and battery-powered IoT edge controllers.

For engineers reviewing the STM32F071CBU7 datasheet, STM32F071CBU7 pinout, STM32F071CBU7 application, or STM32F071CBU7 equivalent, key selection criteria include its 48 MHz CPU clock with internal 48 MHz oscillator + auto-trimming, 5V-tolerant I/Os (68 pins), VDDIO2 support for mixed-voltage interfacing, and RTC with calendar, alarm, and periodic wakeup from Stop/Standby modes.

Technical Context

The STM32F071CBU7 implements a single-core Arm Cortex-M0 processor with Harvard architecture, tightly coupled NVIC supporting up to 32 external interrupts and 16 priority levels. Its memory subsystem includes 128 KB of Flash with error correction (ECC) on read, 16 KB SRAM with hardware parity checking, and a dedicated CRC calculation unit compliant with IEEE-802.3.

Clock management integrates four independent oscillators: 4–32 MHz HSE crystal input, 32 kHz LSE for RTC, 8 MHz HSI with x6 PLL, and factory-trimmed 48 MHz HSI48 oscillator used for USB-free high-speed peripheral operation. Power control supports three low-power modes (Sleep, Stop, Standby) with programmable voltage detector (PVD) and VBAT backup for RTC and 40-byte registers.

Key Specifications

Pinout & Package

STM32F071CBU7 uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad, optimized for compact PCB layouts and thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072CBU7, the STM32F071CBU7 trades USB capability for lower EMI emissions and reduced layout complexity; versus STM32F030F4P6, it delivers 8× more Flash, full analog subsystem, and production-ready RTOS support - making it optimal for scalable, feature-rich edge nodes.

Availability

STM32F071CBU7 is available at Aetrix Electronics and suitable for industrial HMI panels, smart sensor nodes, and energy meter front-ends requiring stable component supply across multi-year production cycles.

Supply support for STM32F071CBU7 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, low-power embedded applications demanding Cortex-M0 performance with rich analog integration and robust toolchain support - optimized for rapid development of certified industrial controls and IoT endpoints.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F071CBU7 achieves 48 MHz maximum CPU frequency using its internal 48 MHz HSI48 oscillator with automatic trimming based on external synchronization, or via PLL multiplication of the 8 MHz HSI or external crystal. No external crystal is required for full-speed operation, reducing BOM count and board area.

Does this MCU support hardware crypto acceleration?

No, the STM32F071CBU7 does not include hardware cryptographic accelerators (e.g., AES, SHA, PKA). It relies on software libraries for encryption tasks. For secure boot or TLS offload, designers should consider STM32L4 or STM32G0 series MCUs with dedicated crypto peripherals.

Can the 12-bit DAC outputs drive external op-amps directly?

Yes - each DAC channel provides rail-to-rail output with 1 µA typical output current and monotonicity guaranteed. For driving low-impedance loads or achieving higher slew rates, an external op-amp buffer is recommended; the DAC reference can be set to internal VREFINT (1.2 V) or external VREF+.

What debug interfaces are supported and what pins do they use?

The STM32F071CBU7 supports Serial Wire Debug (SWD) only - using SWDIO (PA13) and SWCLK (PA14) pins. JTAG is not implemented. SWD enables full flash programming, breakpoint setting, and real-time variable inspection via standard ARM-compliant debug probes (e.g., ST-LINK/V2, CMSIS-DAP).