STMicroelectronics STR91X-SK/RAI

Overview

STR91X-SK/RAI from STMicroelectronics is a Raisonance REva starter kit designed for rapid evaluation and application development of STR91xF ARM966E™-based microcontrollers. It includes the REva universal motherboard, STR912-D/RAI daughterboard (featuring STR912F with 512 KB Flash, Ethernet, USB, CAN, and ETM trace support), embedded RLink JTAG debugger/programmer, and RIDE7 IDE with GNU C toolchain. Used in industrial control prototyping and embedded communications gateway development.

For engineers reviewing the STR91X-SK/RAI datasheet, STR91X-SK/RAI pinout, STR91X-SK/RAI application, or STR91X-SK/RAI equivalent, this page delivers verified hardware architecture, daughterboard MCU specifications, debug capability limits (64 KB debug code), SO-DIMM-based modularity, and direct USB-powered operation - all critical for ARM9-based firmware bring-up and peripheral validation.

Technical Context

The STR91X-SK/RAI is a complete evaluation platform built around the REva motherboard, which hosts interchangeable SO-DIMM daughterboards. Its core architecture integrates an embedded RLink in-circuit debugger with USB host interface and 20-pin JTAG target connection, enabling unlimited Flash programming and debugging up to 64 KB of debug code.

The included STR912-D/RAI daughterboard implements the STR912F microcontroller featuring ARM966E-S core, 512 KB on-chip Flash, 96 KB SRAM, dual CAN 2.0B controllers, 10/100 Ethernet MAC, USB 2.0 OTG, and Embedded Trace Macrocell (ETM) footprint for external trace analysis.

Key Specifications

Availability

STR91X-SK/RAI is available at Aetrix Electronics and suitable for industrial HMI prototyping, embedded gateway development, and ARM9-based firmware validation requiring stable component supply and long-term evaluation platform availability.

Supply support for STR91X-SK/RAI 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

The STR91x family targets high-performance 32-bit embedded control with integrated communication peripherals (CAN, Ethernet, USB), optimized for industrial automation and networked device development.

FAQ

Does STR91X-SK/RAI include the STR912F microcontroller pre-mounted on the daughterboard?

Yes. The STR91X-SK/RAI includes the STR912-D/RAI daughterboard with the STR912F microcontroller soldered onboard. This device features 512 KB Flash, dual CAN, 10/100 Ethernet MAC, USB 2.0 OTG, and ETM trace support - all accessible via the REva motherboard's standard interfaces and connectors.

What software tools are bundled with STR91X-SK/RAI?

The kit ships with Raisonance RIDE7 IDE, GNU C compiler, high-level language debugger, editor, project manager, and SIMICE simulator. It also includes RFlasher for dedicated Flash programming and full integration with the embedded RLink debugger - no additional license purchase is required for basic development and debugging.

Can STR91X-SK/RAI be used with other ST microcontroller daughterboards?

Yes. The REva motherboard uses a standard SO-DIMM connector, allowing direct mechanical and electrical compatibility with STR7-D/RAIS, STM32-D/RAIS, and other Raisonance REva daughterboards. No adapter or modification is needed to swap between STR9, STR7, or STM32 target MCUs.

Is external power required for STR91X-SK/RAI operation?

No. STR91X-SK/RAI is fully USB-powered via the embedded RLink interface. The REva motherboard draws power directly from the host PC's USB port - eliminating the need for external adapters, power supplies, or voltage configuration jumpers during standard evaluation and debugging.