STMicroelectronics STM32F205REY6TR

Overview

STM32F205REY6TR from STMicroelectronics is a 32-bit Arm® Cortex®-M3 microcontroller operating at up to 120 MHz, featuring 512 KB Flash, 128 + 4 KB SRAM, USB OTG HS/FS, 10/100 Ethernet MAC with IEEE 1588v2 hardware support, and dual CAN 2.0B interfaces - deployed in industrial gateways requiring real-time protocol bridging and deterministic network timing.

For engineers reviewing the STM32F205REY6TR datasheet, STM32F205REY6TR pinout, STM32F205REY6TR application, or STM32F205REY6TR equivalent, key selection criteria include Ethernet MAC+DMA integration, ART Accelerator™-enabled zero-wait-state Flash execution, 140 I/Os with 5 V tolerance, and dual USB OTG controllers (FS + HS with ULPI) for host/device/OTG flexibility in embedded connectivity designs.

Technical Context

The STM32F205REY6TR integrates a Cortex-M3 core with Memory Protection Unit (MPU), Adaptive Real-Time Accelerator (ART Accelerator™) for deterministic Flash access, and multi-AHB bus matrix enabling concurrent peripheral DMA transfers. It supports full-speed and high-speed USB OTG via separate PHYs - one on-chip FS PHY, one HS PHY with ULPI interface - allowing simultaneous device/host operation.

Its Ethernet MAC includes dedicated DMA, MII/RMII physical layer support, and hardware-accelerated IEEE 1588v2 timestamping for precision time synchronization. The flexible static memory controller (FSMC) supports NOR, PSRAM, NAND, and CompactFlash, while the 8–14-bit parallel camera interface achieves up to 48 MB/s throughput for machine vision edge preprocessing.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad. Pin count and function mapping align with STM32F205xx family standard layout per DS6329 Rev 18 Section 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F205REY6TR, STM32F207ZGT6 offers more Flash and native MII but sacrifices ULPI-based USB HS host capability, while STM32F407VGT6 delivers superior compute and DSP features at the cost of integrated Ethernet - making the REY6TR optimal for compact, dual-protocol (CAN + Ethernet) edge nodes with USB configurability.

Availability

STM32F205REY6TR is available at Aetrix Electronics and suitable for industrial gateways, protocol converters, and edge vision nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant LQFP64 packaging.

Supply support for STM32F205REY6TR 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32F2 series targets high-performance industrial applications demanding real-time connectivity, deterministic timing, and integrated peripherals - specifically engineered for protocol gateways, motor control, and embedded vision where Ethernet, USB, and CAN coexist.

FAQ

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

The STM32F205REY6TR achieves 120 MHz maximum CPU frequency using its internal PLL driven by the HSE (4–26 MHz crystal) or HSI (16 MHz RC). The ART Accelerator™ enables zero-wait-state execution from Flash memory at this speed, verified per DS6329 Rev 18 Section 3.2. This eliminates instruction fetch stalls and guarantees consistent interrupt latency critical for real-time industrial control.

Does it support hardware IEEE 1588v2 timestamping, and how is it implemented?

Yes - the integrated 10/100 Ethernet MAC includes dedicated hardware timestamping logic compliant with IEEE 1588v2 Annex D. Timestamps are captured on packet ingress/egress with sub-microsecond resolution, stored in descriptor fields, and accessible via DMA-linked descriptors. No software intervention is required for timestamp insertion or extraction, as confirmed in DS6329 Section 3.26 and RM0033 Reference Manual.

Can the USB OTG_HS interface operate without an external PHY?

No - the OTG_HS controller requires an external ULPI-compliant PHY (e.g., SMSC USB334x or Microchip USB3300) for high-speed operation. However, the on-chip full-speed PHY supports OTG_FS functionality independently. The ULPI interface provides a standardized 8-bit parallel bus running at up to 60 MHz, enabling flexible, low-pin-count HS PHY integration per DS6329 Section 3.29.

What are the power supply requirements for VCAP1 and VCAP2 pins?

VCAP1 and VCAP2 require 2.2 µF ±20% X7R ceramic capacitors connected to ground, placed within 1 cm of the pins as specified in DS6329 Section 6.3.2. These stabilize the internal voltage regulator's output and must be populated for reliable operation across the full temperature range (–40°C to +105°C). Omission causes boot failure or erratic reset behavior under load.