STMicroelectronics STM8/128-EV/TS

Overview

STM8/128-EV/TS from STMicroelectronics is a touch-sensing evaluation kit comprising the STM8/128-EVAL main board and STM8Sxxx-TS1 daughterboard, enabling capacitive touchkey and slider implementation using RC acquisition on STM8S microcontrollers. It supports 5 touchkeys + 1 slider, features an LCD for real-time status reporting, and includes configurable debounce, low-power mode duration, recalibration timeout, and 5- or 8-channel slider resolution.

For engineers reviewing the STM8/128-EV/TS datasheet, STM8/128-EV/TS pinout, STM8/128-EV/TS application, or STM8/128-EV/TS equivalent, this kit delivers validated firmware, hardware layout reference, and source-code library integration for rapid prototyping of capacitive user interfaces in consumer and industrial HMI designs.

Technical Context

The kit implements resistor-capacitor (RC) charge-transfer acquisition to detect capacitance changes from finger proximity, with dedicated firmware handling signal conditioning, autocalibration, and environment control system (ECS) compensation. It supports up to 24 touchkeys or two wheels/sliders using 5–8 channels per device.

Hardware integration relies on standard STM8S GPIOs-only one I/O per channel plus one shared load-resistor control line-enabling low-BOM design. The included C source library provides full processing stack: debounce filtering, detection exclusion, active shield support, and up to 8-bit slider resolution.

Key Specifications

Availability

STM8/128-EV/TS is available at Aetrix Electronics and suitable for consumer appliance UI development, industrial HMI prototyping, white-goods control panel validation, and embedded touch interface qualification requiring stable component supply and documented reference design assets.

Supply support for STM8/128-EV/TS 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, analog ICs, power devices, and sensors for industrial, automotive, and consumer applications.

This kit belongs to ST's STM8S touch-sensing ecosystem, developed specifically to accelerate adoption of cost-effective, robust capacitive touch interfaces in resource-constrained 8-bit MCU systems without external sensing ASICs.

FAQ

Does STM8/128-EV/TS include production-ready firmware?

Yes-it ships with a complete, free C source-code touch-sensing library optimized for STM8S MCUs. The library includes production-grade features: autocalibration, environment control system (ECS), debounce filtering, and active shield support, all configurable via runtime parameters and documented APIs.

Can the STM8Sxxx-TS1 daughterboard be used independently of the STM8/128-EVAL board?

No-the STM8Sxxx-TS1 daughterboard requires the STM8/128-EVAL base board for power, clock, debug interface, and MCU execution. It lacks onboard voltage regulation, programming circuitry, or reset logic and is designed exclusively as a plug-in extension for that specific evaluation platform.

What is the minimum MCU requirement to port the touch library to a custom design?

The library targets STM8S series MCUs with at least 32 KB Flash, 2 KB RAM, and one 16-bit timer with input capture capability. Required peripherals include GPIOs with fast switching, a calibrated internal RC oscillator, and sufficient I/Os for touch channels plus load-resistor control.

Is hardware modification needed to evaluate slider functionality?

No-slider operation is fully supported out-of-box using the pre-mounted PCB pattern on the STM8Sxxx-TS1 board. The physical slider electrode is implemented as a segmented copper trace; no soldering, jumpering, or layout change is required to test 5- or 8-channel slider resolution modes.