STMicroelectronics STM32F078CBU6TR

Overview

STM32F078CBU6TR from STMicroelectronics is an Arm® Cortex®-M0 32-bit microcontroller with 128 KB Flash, 16 KB SRAM (HW parity), crystal-less USB 2.0 FS interface, and integrated 12-bit dual DAC + 12-bit ADC - deployed in industrial HMI touch panels requiring low-power capacitive sensing and embedded USB device connectivity.

For engineers reviewing the STM32F078CBU6TR datasheet, STM32F078CBU6TR pinout, STM32F078CBU6TR application, or STM32F078CBU6TR equivalent, key selection criteria include USB 2.0 FS operation without external crystal, 48 MHz max CPU frequency with internal 48 MHz oscillator trimming, 5V-tolerant I/O count (up to 67), and VDD = 1.8 V ±8% supply compatibility for ultra-low-voltage system integration.

Technical Context

This MCU integrates a crystal-less USB 2.0 full-speed PHY synchronized via CRS (Clock Recovery System) to internal 48 MHz HSI48 oscillator, eliminating need for external 48 MHz crystal while maintaining ±0.25% USB timing accuracy. Its 128 KB Flash supports secure boot and read-out protection, and 16 KB SRAM includes hardware parity checking for safety-critical data buffers.

The device features dual 12-bit DACs with configurable output buffers and noise suppression, a 12-bit 1.0 µs ADC with 16-channel multiplexing and separate 2.4–3.6 V analog supply, and up to 23-channel capacitive sensing controller (TSC) supporting touchkey, linear, and rotary sensors - all operating under 1.8 V digital supply.

Key Specifications

Pinout & Package

STM32F078CBU6TR is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad, optimized for compact industrial control modules and space-constrained HMI designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072CBU6, STM32F078CBU6TR saves crystal-related BOM and layout overhead while delivering identical analog and touch capability; versus STM32F091CCU6, it trades CAN and memory for dedicated TSC resources - making it optimal for cost-sensitive, touch-centric USB devices.

Availability

STM32F078CBU6TR is available at Aetrix Electronics and suitable for industrial HMI touch panels, USB-capable sensor nodes, programmable logic controller (PLC) I/O modules, and smart power outlets requiring stable component supply across multi-year production cycles.

Supply support for STM32F078CBU6TR 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong industrial and consumer market presence.

The STM32F0 series targets cost-sensitive, resource-efficient embedded applications demanding high integration, low power, and USB connectivity - particularly in industrial controls, appliance UIs, and smart peripherals.

FAQ

Does STM32F078CBU6TR support USB device functionality without an external crystal?

Yes. It integrates a crystal-less USB 2.0 full-speed PHY synchronized to the internal 48 MHz HSI48 oscillator using the Clock Recovery System (CRS). This eliminates the need for an external 48 MHz crystal while meeting USB timing accuracy requirements (±0.25%) via automatic oscillator trimming based on USB Start-of-Frame packets.

What is the maximum number of 5V-tolerant I/Os on STM32F078CBU6TR?

The STM32F078CBU6TR supports up to 67 5V-tolerant I/O pins across its UFQFPN48 package. These pins maintain 5V tolerance regardless of the VDD supply voltage (1.8 V ±8%), enabling direct interfacing with legacy 5V logic, optocouplers, and industrial I/O standards without external level shifters.

Can the internal 12-bit DACs operate independently with different triggers?

Yes. Both DAC channels (DAC1 and DAC2) support independent trigger sources including TIM2/TRGO, TIM3/TRGO, EXTI line 9, and software trigger. Each DAC has its own output buffer, noise reduction mode, and configurable alignment - allowing synchronized or asynchronous waveform generation for multi-channel analog control.

Is the capacitive sensing controller (TSC) supported in the UFQFPN48 package variant?

Yes. The STM32F078CBU6TR (UFQFPN48) exposes 16 TSC channels (CH1–CH16) on dedicated GPIO pins including PA0–PA7, PB0–PB1, PC0–PC5, and PF0–PF1. All TSC features - spread-spectrum acquisition, shield electrode support, and low-power scan modes - are fully functional in this package per the DS10212 Rev 6 datasheet section 3.13.