STMicroelectronics STM32F070RBT6

Overview

STM32F070RBT6 from STMicroelectronics is a 32-bit Arm® Cortex®-M0 microcontroller with 128 KB flash, 16 KB SRAM, USB 2.0 Full-Speed interface, 11 timers (including one 16-bit advanced-control timer), and a 12-bit ADC-designed for cost-sensitive industrial control, smart sensors, and USB-connected peripherals operating from 2.4–3.6 V.

For engineers reviewing the STM32F070RBT6 datasheet, STM32F070RBT6 pinout, STM32F070RBT6 application, or STM32F070RBT6 equivalent, key selection criteria include USB FS support, 51 I/Os with 5V tolerance, integrated RTC with alarm, low-power Stop/Standby modes, and SWD debug capability.

Technical Context

The device integrates an Arm Cortex-M0 core running up to 48 MHz, supported by multiple clock sources: 4–32 MHz HSE crystal, 32.768 kHz LSE for RTC, and internal 8 MHz HSI with PLL for USB clock generation. Its memory subsystem includes 128 KB flash with ECC and 16 KB SRAM with hardware parity.

Peripheral architecture features a 5-channel DMA controller, dual I²C interfaces (one supporting Fast Mode Plus at 1 Mbit/s), four USARTs (one with auto baud rate detection), two SPIs (18 Mbit/s), and a full-speed USB 2.0 interface with Battery Charging Detection (BCD) and Link Power Management (LPM) support.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with 64 pins, ECOPACK2-compliant, RoHS-compliant, and 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 STM32F072RBT6, the STM32F070RBT6 trades CAN/crypto for lower unit cost and identical USB/RTC/I/O capabilities; versus STM32F030RBT6, it adds essential USB FS, calendar RTC, 5V-tolerant I/Os, and doubled memory-making it the optimal balance for USB-connected embedded controllers.

Availability

STM32F070RBT6 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB human interface devices, and smart lighting controllers requiring stable component supply, long-term lifecycle assurance, and full production traceability.

Supply support for STM32F070RBT6 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM32F0 series targets cost-optimized, entry-level Arm Cortex-M0 microcontrollers for resource-constrained applications requiring USB connectivity, analog integration, and industrial-grade reliability.

FAQ

Does STM32F070RBT6 support USB device mode only, or can it act as a USB host?

No, STM32F070RBT6 implements only USB 2.0 Full-Speed device mode with integrated PHY-it lacks OTG capabilities or host controller logic. It cannot enumerate as a USB host or support USB peripherals like keyboards or storage. The USB interface is strictly device-side, compliant with USB HID, CDC, and MSC class descriptors when configured in firmware.

What is the maximum allowed VDDA voltage relative to VDD?

VDDA must be equal to or less than VDD, and both must remain within 2.4–3.6 V. The datasheet explicitly prohibits VDDA > VDD to prevent damage to analog circuits; VDDA = VDD is the recommended configuration. Deviation risks ADC accuracy degradation and potential latch-up in the analog front-end.

Can PA11 and PA12 be used as general-purpose I/Os when USB is disabled?

No-PA11 (USB DM) and PA12 (USB DP) are permanently dedicated to USB functionality and cannot be remapped or used as standard GPIOs, even when USB is unconfigured in software. Their alternate function is fixed and non-removable per the device's silicon design and pin multiplexing architecture.

Is the internal 8 MHz RC oscillator accurate enough for USB clock generation?

Yes-the internal 8 MHz HSI oscillator is trimmed to ±1% accuracy and feeds a programmable PLL that generates the precise 48 MHz clock required for USB Full-Speed operation. No external crystal is needed for USB compliance, though using the HSE + PLL provides tighter timing stability for high-reliability applications.