STMicroelectronics STM32F105RCT7

Overview

STM32F105RCT7 from STMicroelectronics is a 32-bit ARM Cortex-M3 microcontroller in the Connectivity line, featuring 256 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 between CAN, Ethernet, and USB.

For engineers reviewing the STM32F105RCT7 datasheet, STM32F105RCT7 pinout, STM32F105RCT7 application, or STM32F105RCT7 equivalent, key selection criteria include dual-CAN timing synchronization, Ethernet MAC DMA buffer allocation (4 KB), USB OTG host/device role switching latency, and 72 MHz deterministic interrupt response under RTOS scheduling.

Technical Context

The STM32F105RCT7 integrates a single ARM Cortex-M3 core running at up to 72 MHz with hardware division and single-cycle multiplication, coupled with nested vectored interrupt controller (NVIC) supporting 68 maskable interrupts. Its connectivity subsystem includes two independent CAN 2.0B controllers each backed by 256 bytes of dedicated SRAM, enabling concurrent CAN FD-ready message filtering and transmission without CPU intervention.

It implements a full-featured 10/100 Ethernet MAC with MII/RMII physical layer support, integrated DMA engine, and IEEE 1588 precision timestamping logic - allowing hardware-accelerated time-synchronized packet capture and egress scheduling. The USB OTG FS controller supports HNP/SRP/ID detection and uses 1.25 KB of dedicated SRAM for endpoint FIFO management.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F107VCT6, the STM32F105RCT7 offers identical peripheral sets in a smaller LQFP64 package - ideal for space-constrained gateways - while the STM32F407VGT6 trades integrated Ethernet for higher CPU performance and floating-point capability, increasing system complexity for pure connectivity tasks.

Availability

STM32F105RCT7 is available at Aetrix Electronics and suitable for industrial gateways, automotive diagnostic tools, smart grid nodes, and PLC backplane modules requiring stable component supply across extended lifecycle commitments.

Supply support for STM32F105RCT7 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, specializing in microcontrollers, power management, sensors, and automotive ICs with vertical manufacturing capabilities.

The STM32F105xx series belongs to ST's Connectivity line - designed specifically for embedded applications demanding integrated high-speed wired interfaces (CAN, USB OTG, Ethernet) without external bridge components.

FAQ

Does STM32F105RCT7 support USB OTG Host mode with external device enumeration?

Yes. The on-chip USB OTG FS controller supports full host mode with Session Request Protocol (SRP) and Host Negotiation Protocol (HNP), enabling dynamic role switching and enumeration of standard USB devices such as HID keyboards, CDC modems, and mass storage drives without external PHY.

What is the maximum achievable CAN bit rate with STM32F105RCT7's built-in controllers?

The dual CAN 2.0B controllers support bit rates up to 1 Mbps at 72 MHz APB1 clock, validated per ISO 11898-1 with programmable timing quanta (BS1/BS2/SJW). At 1 Mbps, sample point is configurable between 75% and 87.5%, meeting automotive EMC requirements.

How does the Ethernet MAC handle IEEE 1588 timestamping in hardware?

The MAC includes dedicated timestamp registers and logic that automatically inserts 64-bit timestamps into transmit descriptors and attaches them to received frames - synchronized to an internal 100 MHz timer. Timestamp resolution is 10 ns, with hardware compensation for MAC delay and PHY propagation.

Is the LQFP64 package of STM32F105RCT7 pin-compatible with other STM32F105 variants?

No. STM32F105RCT7 uses the LQFP64 package (64 pins), while STM32F105RBT6 and STM32F105VCT6 use LQFP64 and LQFP100 respectively. Pin mapping differs across packages - for example, Ethernet RMII signals are unavailable in LQFP64, and certain CAN/USB functions are multiplexed onto different pins.