STMicroelectronics STM32F105VBT6

Overview

STM32F105VBT6 from STMicroelectronics is a 32-bit ARM Cortex-M3 microcontroller in LQFP100 package, featuring 128 KB Flash, 64 KB SRAM, dual CAN 2.0B interfaces, USB OTG FS with on-chip PHY, and 10/100 Ethernet MAC with IEEE 1588 support - deployed in industrial gateways requiring real-time protocol bridging and deterministic network timing.

For engineers reviewing the STM32F105VBT6 datasheet, STM32F105VBT6 pinout, STM32F105VBT6 application, or STM32F105VBT6 equivalent, key selection criteria include Ethernet MAC + dual CAN coexistence, 72 MHz deterministic execution, USB OTG host/device capability, and 512-byte CAN SRAM per interface for high-throughput automotive diagnostics and factory automation edge nodes.

Technical Context

The STM32F105VBT6 integrates a single ARM Cortex-M3 core with Harvard bus architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for sub-12-cycle interrupt latency. It implements dual independent CAN controllers with dedicated 512-byte SRAM each, enabling concurrent CAN FD-ready message buffering and filtering without CPU intervention.

Its connectivity stack includes a full-speed USB OTG controller with integrated PHY and HNP/SRP/ID support, plus a 10/100 Ethernet MAC with dedicated DMA engine, 4 KB SRAM, MII/RMII physical layer options, and hardware IEEE 1588 timestamping - enabling precise time-synchronized packet handling in industrial Ethernet applications.

Key Specifications

Pinout & Package

LQFP100 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, 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 connectivity MCU applications.

Compared with STM32F107VCT6, the STM32F105VBT6 offers USB OTG host capability and tighter Flash/SRAM balance for protocol gateway firmware; versus STM32F407VGT6, it delivers lower-system-cost Ethernet integration at the expense of FPU and raw compute headroom.

Availability

STM32F105VBT6 is available at Aetrix Electronics and suitable for industrial gateways, automotive diagnostic tools, PLC I/O modules, and motor drive controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32F105VBT6 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, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32F105xx series belongs to ST's Connectivity Line - engineered specifically for embedded systems demanding integrated high-speed wired interfaces (Ethernet, dual CAN, USB OTG) without external glue logic or PHY components.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32F105VBT6 operates at up to 72 MHz with 1.25 DMIPS/MHz (Dhrystone 2.1), delivering 90 DMIPS total. This performance level supports real-time execution of dual CAN stacks, lightweight TCP/IP (e.g., LwIP), and USB device enumeration within tight interrupt latency budgets.

Does this MCU support hardware IEEE 1588 timestamping, and how is it implemented?

Yes - the integrated 10/100 Ethernet MAC includes dedicated hardware timestamping logic that captures precise ingress/egress timestamps at the MAC layer with ±50 ns accuracy. Timestamp registers are accessible via memory-mapped registers and synchronized to the internal system clock domain.

How much dedicated SRAM is allocated to each CAN controller, and why does it matter?

Each CAN controller has 512 bytes of dedicated SRAM for message objects, filters, and FIFO buffers. This eliminates CPU polling overhead and enables autonomous message acceptance/rejection, allowing the core to remain in low-power Stop mode while CAN traffic is processed - critical for battery-powered gateways.

Can the USB OTG interface operate in both host and device modes simultaneously?

No - the USB OTG FS controller supports dynamic role switching (host/device) via HNP/SRP/ID signaling, but only one mode is active at a time. Simultaneous dual-role operation is not supported; however, seamless transition between roles enables field-service tools to act as USB host for flash drives or device for PC connection.