STMicroelectronics STMT/8L-EV1

Overview

STMT/8L-EV1 from STMicroelectronics is an STM8L evaluation board featuring an STM8L151 microcontroller in 48-pin LQFP, integrated touch-sensing library, 10 capacitive touchkeys, 1 wheel, 1 slider, and LCD display for real-time status reporting. It supports configurable debounce, low-power mode duration, recalibration timeout, and 8-bit wheel/slider resolution using 3 channels.

For engineers reviewing the STMT/8L-EV1 datasheet, STMT/8L-EV1 pinout, STMT/8L-EV1 application, or STMT/8L-EV1 equivalent, this board enables rapid validation of capacitive touch interfaces on STM8L MCUs-especially for UI development requiring robust noise immunity, fast acquisition (2 ms key / 7 ms wheel), and source-code-level customization of sensing parameters.

Technical Context

The board implements ST's charge-transfer acquisition method with hardware support from the STM8L151's built-in capacitive sensing peripherals, including dedicated sampling capacitors and I/O routing for up to 16 channels. It uses a single I/O per channel plus one shared I/O per acquisition group, minimizing BOM cost and PCB footprint.

Embedded ST-Link interface enables in-circuit firmware evaluation without external debuggers. The touch-sensing library provides autocalibration, debounce filtering, environment control system (ECS), and detection exclusion-enabling reliable operation under varying humidity, temperature, and conductive noise conditions.

Key Specifications

Availability

STMT/8L-EV1 is available at Aetrix Electronics and suitable for touch-based HMI development, portable medical device interfaces, industrial control panels, and consumer appliance UIs requiring stable component supply and rapid prototyping capability.

Supply support for STMT/8L-EV1 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.

The STM8L product line targets ultra-low-power embedded systems, with STMT/8L-EV1 specifically engineered to accelerate development of capacitive touch user interfaces on 8-bit MCUs-emphasizing noise resilience, minimal external components, and full C-source library portability.

FAQ

Does STMT/8L-EV1 require external programming hardware?

No. The board integrates ST-Link circuitry, enabling direct USB connection to a Windows PC for firmware download, debugging, and library evaluation using ST Visual Develop v4.1.5 or newer-no external debugger or programmer is needed.

Can the touch-sensing library be ported to other STM8L devices?

Yes. The free C-source library is designed for portability across the STM8Lxxx family. It requires only compatible capacitive sensing peripherals and GPIO configuration-verified on STM8L151, STM8L152, and STM8L05x derivatives per ST's official documentation.

What is the minimum host system requirement to run the evaluation software?

A Windows PC running Windows 2000, XP, or Vista is required. The board connects via standard USB A-to-Mini-B cable. No additional drivers are needed beyond those included with ST Visual Develop or automatically installed by Windows.

How does the environment control system (ECS) improve touch reliability?

ECS continuously monitors baseline capacitance drift caused by temperature/humidity changes and adjusts thresholds dynamically. Combined with autocalibration and debounce filtering, it maintains stable detection across environmental shifts-critical for unattended or long-duration deployments.