STMicroelectronics STM8S105K6T3C

Overview

STM8S105K6T3C from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash memory with 20-year data retention at 55 °C, 1 Kbyte true data EEPROM (300 kcycle endurance), 10-bit ADC with up to 10 channels, and integrated UART, SPI, and I²C interfaces. It targets cost-sensitive industrial control, appliance motor management, and sensor interface applications requiring robust I/O and low-power operation.

For engineers reviewing the STM8S105K6T3C datasheet, STM8S105K6T3C pinout, STM8S105K6T3C application, or STM8S105K6T3C equivalent, key selection criteria include its LQFP48 package with 38 I/Os (16 high-sink), dual watchdog timers, flexible clock sources (16 MHz RC, crystal, external), and SWIM single-wire debug interface for in-system programming.

Technical Context

The STM8S105K6T3C implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, enabling efficient code density and deterministic interrupt latency. Its nested interrupt controller supports 32 interrupts and up to 37 external interrupt lines mapped across 6 vectors.

Memory subsystem includes separate program Flash (32 KB), data EEPROM (1 KB), and RAM (2 KB), all accessible via unified addressing. The clock system integrates four master sources - trimmable 16 MHz RC, 128 kHz low-power RC, crystal oscillator, and external clock - with clock security monitoring and per-peripheral clock gating.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 48 leads; thermally enhanced for industrial ambient operation up to 85 °C junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with STM8S105K6T3C, STM8S003F3P6 sacrifices EEPROM and ADC channels for lower cost and footprint, while STM8L052C6T6 trades I/O drive strength and interrupt latency for extreme low-power operation - making each suitable only for distinct power/performance trade-offs.

Availability

STM8S105K6T3C is available at Aetrix Electronics and suitable for industrial motor control, home appliance interface, and sensor node applications requiring stable component supply and long-term manufacturing continuity.

Supply support for STM8S105K6T3C 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, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM8S series delivers cost-optimized 8-bit MCUs targeting resource-constrained embedded systems needing high reliability, rich peripherals, and mature toolchain support - especially in white goods and industrial controls.

FAQ

What debug interface does STM8S105K6T3C support?

The STM8S105K6T3C uses the Single Wire Interface Module (SWIM), a proprietary 1-pin debug and programming interface compatible with ST-LINK/V2 and ST-LINK/V2-1 debuggers. It supports full-speed debugging, flash programming, and memory inspection without requiring additional pins or complex setup - unlike JTAG or SWD used in 32-bit MCUs.

Does STM8S105K6T3C support hardware CRC calculation?

No, the STM8S105K6T3C does not include a dedicated hardware CRC peripheral. CRC computation must be implemented in firmware using standard polynomial algorithms (e.g., CRC-8 or CRC-16). The device provides sufficient CPU performance (16 MHz) and RAM (2 KB) to execute efficient software CRC routines for communication frame integrity checking.

Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?

Yes, the internal 16 MHz RC oscillator is user-trimmable via the CLK_HSITRIMR register, allowing adjustment in ±16 steps (±0.5% typical step size). Calibration can be performed at production test using an external reference clock or crystal oscillator, achieving ±1% accuracy across voltage and temperature - sufficient for UART communication at 115.2 kbps without external crystal.

What is the maximum operating frequency under 3.3 V supply?

At VDD = 3.3 V, the STM8S105K6T3C supports a maximum CPU frequency of 16 MHz, as confirmed by Figure 11 in DS5855 Rev 16. This is enabled by its adaptive voltage regulator and robust core design - unlike many 8-bit MCUs that derate to 8 MHz or lower at 3.3 V, ensuring full performance in mixed-voltage systems.