STMicroelectronics STM32F071CBT7

Overview

STM32F071CBT7 from STMicroelectronics is a 32-bit Arm® Cortex®-M0 microcontroller with 128 KB Flash, 16 KB SRAM (with hardware parity), and operating voltage range of 2.0–3.6 V. It integrates a 12-bit ADC (1.0 µs conversion), dual-channel 12-bit DAC, two analog comparators, RTC with calendar, and up to 48 MHz CPU clock-used in industrial sensor nodes requiring low-power operation and mixed-signal control.

For engineers reviewing the STM32F071CBT7 datasheet, STM32F071CBT7 pinout, STM32F071CBT7 application, or STM32F071CBT7 equivalent, key selection criteria include Flash/SRAM size, 5V-tolerant I/O count (up to 68), USB-less communication interface mix (4× USART, 2× SPI, 2× I²C), and support for capacitive touch sensing across 24 channels.

Technical Context

The device implements a single-cycle Cortex-M0 core with Thumb-2 instruction set, supporting deterministic real-time execution at up to 48 MHz. Memory subsystem includes error-detecting SRAM and Flash with CRC calculation unit for firmware integrity verification.

Power architecture features three independent supply domains (VDD, VDDA, VDDIO2), programmable voltage detector (PVD), and three low-power modes (Sleep, Stop, Standby) with sub-1 µA Standby current and RTC retention via VBAT. Clock system combines internal oscillators (HSI48 with auto-trimming, LSI, HSI14) and external sources (4–32 MHz HSE, 32 kHz LSE).

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant ECOPACK®2, rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F071CBT7, the F070CBT6 reduces cost and power by removing DAC and RTC battery backup but sacrifices time-aware control and analog output. The F091CBT6 adds USB but removes VDDIO2 flexibility, limiting interoperability with 5V peripherals in industrial settings.

Availability

STM32F071CBT7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance HMIs, energy meter front-ends, and PLC digital I/O modules requiring stable component supply and long-term manufacturability.

Supply support for STM32F071CBT7 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-grade components since 1987.

The STM32F0 series targets cost-sensitive, low-power embedded applications requiring high integration and industrial reliability - optimized for appliances, industrial controls, and consumer electronics where USB is unnecessary but analog/mixed-signal capability is critical.

FAQ

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

The STM32F071CBT7 achieves 48 MHz CPU frequency using its internal 48 MHz HSI48 oscillator with automatic trimming based on external synchronization (e.g., USB SOF or LSE), or via PLL multiplication of the 8 MHz HSI. No external crystal is required for full-speed operation, reducing BOM cost and board space.

Does this MCU support hardware encryption or secure boot?

No - the STM32F071CBT7 does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security measures and external secure elements for key storage and firmware authentication in sensitive applications.

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

The DAC outputs are buffered but limited to 5 mA sink/source per channel. They can drive high-impedance inputs (e.g., op-amp inverting inputs) directly, but external amplification is required for driving LEDs, relays, or low-impedance sensors without distortion or voltage droop.

How many I²C interfaces support Fast Mode Plus (1 Mbit/s)?

One I²C interface (I²C1) supports Fast Mode Plus (1 Mbit/s) with 20 mA current sink capability, enabling reliable communication with fast peripherals like EEPROMs or digital potentiometers. The second I²C (I²C2) operates up to 400 kbit/s and supports SMBus/PMBus with wakeup capability.