STMicroelectronics STR731FV2T6 32-bit ARM7 Microcontroller

STMicroelectronics STR731FV2T6: High-Performance 32-bit ARM7 Microcontroller for Industrial Applications

The STMicroelectronics STR731FV2T6 represents a powerful solution for embedded systems requiring robust processing capabilities and versatile peripheral integration. As part of ST's STR7 family, this 32-bit ARM7® microcontroller combines advanced architecture with comprehensive interface options, making it ideal for demanding industrial automation, automotive, and IoT applications. This device features 256KB of Flash memory and a 100-LQFP surface mount package, offering developers a balance of performance, connectivity, and design flexibility.

Core Architecture and Processing Power

At its heart, the STR731FV2T6 utilizes the proven ARM7TDMI® processor core, delivering efficient 32-bit processing at 36MHz clock speeds. This architecture provides exceptional computational power while maintaining low power consumption through its optimized instruction set and internal oscillator. The 32-bit single-core design ensures seamless execution of complex algorithms required in modern embedded systems, from motor control to real-time data processing.

Engineered for reliability in harsh environments, the device operates across -40°C to 85°C temperature ranges while maintaining stable 4.5V-5.5V power supply requirements. This wide operating range makes it suitable for industrial equipment and automotive systems where thermal stability is critical.

Peripheral Integration and Connectivity

The STR731FV2T6 excels in peripheral integration, featuring 72 general-purpose I/O lines and a comprehensive suite of communication interfaces. Developers benefit from built-in CANbus, I²C, SPI, and multiple UART/USART controllers, enabling seamless connectivity to sensors, displays, and network modules. The inclusion of Direct Memory Access (DMA) controllers reduces CPU overhead during data transfers, while 12-channel 10-bit analog-to-digital converters provide precise signal processing capabilities.

Key peripheral features include:

• 72 programmable GPIO pins
• 12x10b analog-to-digital converters
• Integrated watchdog timer (WDT)
• Advanced PWM generation
• Power-on reset (POR) circuitry

Memory Architecture and Storage Capabilities

This microcontroller offers 256KB of Flash memory (organized as 256K x 8) for program storage, paired with 16KB of SRAM for data operations. The Flash memory supports in-application programming, allowing firmware updates without external programming hardware. While lacking EEPROM, the device compensates with Flash endurance enhancements that support frequent data logging applications.

Design Considerations and Availability

As an obsolete product, the STR731FV2T6 remains widely used in existing designs where long-term reliability and proven performance are priorities. Its surface mount 100-LQFP package offers a compact footprint while maintaining accessible pin spacing for standard PCB manufacturing processes. While newer microcontrollers offer enhanced features, this device continues to serve in legacy systems requiring its specific combination of peripherals and processing power.

For developers maintaining systems using this microcontroller, STMicroelectronics provides comprehensive documentation including datasheets, application notes, and reference designs through their official resources. The device's compatibility with standard ARM development tools ensures continued support for code optimization and system debugging.

Applications and Industry Use Cases

The STR731FV2T6's feature set makes it particularly suited for applications including:

• Industrial motor control systems
• Automotive body electronics
• Building automation controllers
• Medical monitoring equipment
• Smart metering solutions

Its combination of CANbus connectivity, rugged operating specifications, and comprehensive peripheral integration makes it a versatile choice for embedded systems where reliability and interface flexibility are paramount.

Tags: Embedded Systems, Industrial Automation, Automotive Electronics, Microcontroller Units, Surface Mount Devices