STMicroelectronics STM8L101-EVAL

Overview

STM8L101-EVAL from STMicroelectronics is an evaluation board built around the STM8L101 ultra-low-power 8-bit microcontroller, featuring integrated comparator, I²C, SPI, USART, and SWIM debug interface. It includes a 122×32 LCD module, microSD card slot, 64 Kbit I²C EEPROM, RS-232 transceiver, bi-color LED, joystick, potentiometer, and analog voltage measurement circuit - enabling rapid prototyping of battery-powered sensor nodes and portable instrumentation.

For engineers reviewing the STM8L101-EVAL datasheet, STM8L101-EVAL pinout, STM8L101-EVAL application, or STM8L101-EVAL equivalent, this board supports hands-on validation of low-power peripheral integration, real-time analog threshold detection, serial memory interfacing, and human-interface subsystem development with minimal external components.

Technical Context

The STM8L101-EVAL comprises two interconnected PCBs: MB709 (motherboard) hosting peripherals including 3.3 V regulator, RS-232 transceiver, LCD driver, audio circuit, and microSD interface; and MB710 (daughterboard) integrating the STM8L101F3P3 MCU in TSSOP20 package with 16 KB Flash, 1 KB RAM, and 128 B EEPROM. All MCU peripherals are routed to headers or onboard functions via dedicated signal paths.

Hardware design enables direct evaluation of key low-power features: comparator-based wake-up from halt mode, I²C EEPROM read/write at 100 kHz, USART loopback over RS-232, SPI-driven LCD refresh, and ADC sampling using the on-board 10 kΩ potentiometer as analog source - all operating within 1.8–3.6 V supply range.

Key Specifications

Availability

STM8L101-EVAL is available at Aetrix Electronics and suitable for ultra-low-power embedded development, portable sensor node validation, and educational MCU labs requiring stable component supply and full peripheral access.

Supply support for STM8L101-EVAL 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 specializing in microcontrollers, power management, sensors, and automotive ICs, with R&D and manufacturing across Europe, Asia, and the Americas.

The STM8L series targets battery-operated applications demanding sub-μA standby current, fast wake-up, and integrated analog peripherals - optimized for smart meters, wearable devices, and wireless sensor endpoints.

FAQ

Does STM8L101-EVAL support programming via SWIM interface?

Yes. The board includes a dedicated SWIM debug connector compatible with ST-LINK/V2 and ST Visual Development tools. It allows full in-circuit debugging, flash programming, and register inspection without requiring additional adapters or soldering. The SWIM signal path is directly wired to the STM8L101F3P3's SWIM pin (PB4) on the MB710 daughterboard.

Can the on-board LCD be replaced with a custom display?

Yes. The 122×32 serial LCD module connects via a 10-pin header labeled "LCD" on MB709, exposing VDD, GND, SCL, SDA, and control lines. Its protocol is standard I²C-based, allowing substitution with functionally equivalent modules. Pinout and timing match common SSD1306-compatible displays, though firmware initialization may require adjustment.

What is the role of the bi-color LED on STM8L101-EVAL?

The bi-color LED (red/green) is connected to MCU pins PD4 and PD5 via current-limiting resistors. It serves as a dual-state visual indicator - e.g., red for error/warning, green for OK/active - and demonstrates GPIO toggle capability, PWM dimming, and interrupt-driven state changes using the STM8L101's flexible output control and timer resources.

Is microSD card support hardware-accelerated or bit-banged?

microSD communication uses the STM8L101's hardware SPI peripheral (pins PC4–PC7), not bit-banged GPIO. The motherboard includes level translation and pull-up resistors matching SD 2.0 spec. Firmware examples provided by ST use polled SPI transfers with CRC checking, supporting FAT16 file operations up to 2 GB capacity.