STMicroelectronics STM8S/8-D/RAIS

Overview

STM8S/8-D/RAIS from Raisonance is a standalone interchangeable daughterboard featuring the STM8S903K3 8-bit microcontroller in LQFP32 package, supporting SWIM-based in-circuit debugging and programming, with on-board clock source selection jumper and oscillator footprint for rapid application development on the REva evaluation platform.

For engineers reviewing the STM8S/8-D/RAIS datasheet, STM8S/8-D/RAIS pinout, STM8S/8-D/RAIS application, or STM8S/8-D/RAIS equivalent, this board enables immediate firmware prototyping, peripheral validation (ADC, I²C, SPI), and low-power MCU evaluation without external power - all via USB-powered REva motherboard integration.

Technical Context

The STM8S/8-D/RAIS implements the STM8S903K3 MCU - a 16 MHz max frequency, 8 KB Flash, 1 KB RAM, 640 B EEPROM device with 25 I/Os, 10-bit ADC (5 channels), UART, SPI, I²C, and 4-channel 16-bit timer - optimized for cost-sensitive embedded control.

It interfaces exclusively via ST's SWIM (Single Wire Interface Module) protocol through the embedded RLink on the REva motherboard, eliminating need for JTAG/ICC adapters, and relies on the REva's configurable VDD settings (1.8 V / 3.3 V / 5 V) to match the STM8S903K3's 2.95–5.5 V operating range.

Key Specifications

Availability

STM8S/8-D/RAIS is available at Aetrix Electronics and suitable for industrial HMI prototyping, smart sensor node development, educational MCU labs, and low-power embedded control requiring stable component supply across design-in, qualification, and small-batch production phases.

Supply support for STM8S/8-D/RAIS 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

Raisonance is a France-based embedded tools developer specializing in integrated development environments and hardware evaluation platforms for 8-bit and 32-bit microcontrollers.

This daughterboard belongs to the REva modular evaluation system product line, designed to accelerate application development across STM8 and ST7 MCU families using interchangeable hardware and unified Ride7 software toolchain.

FAQ

Is STM8S/8-D/RAIS a complete starter kit or a daughterboard only?

STM8S/8-D/RAIS is a standalone daughterboard - it requires the REva motherboard (sold separately) and embedded RLink for operation. It does not include cables, power supplies, or software licenses; those are provided with full starter kits like STM8-SK/RAIS.

Which IDE and compiler versions are supported?

Ride7 IDE v7.x and RFlasher7 are officially supported. The included STM8 C compiler (free version) allows up to 2 KB code size; full-featured commercial licenses enable unlimited compilation and CodeCompressor optimization for flash reduction.

Can STM8S/8-D/RAIS be used with non-REva hosts?

No - it is mechanically and electrically designed only for the REva motherboard's SO-DIMM connector and RLink's SWIM interface. It lacks USB, external power terminals, or standard debug headers required for third-party programmers or generic development boards.

Does this board include an external crystal or internal RC oscillator?

The board includes both: an oscillator footprint (0805-sized pad) for external crystal installation and a clock source selection jumper to configure between internal RC (16 MHz factory-trimmed) and external crystal (1–24 MHz) modes per STM8S903K3 specifications.