STMicroelectronics STM8S105K6B6

Overview

STM8S105K6B6 from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash program memory, 1 Kbyte true data EEPROM, and integrated 10-bit ADC with up to 10 channels. It supports UART, SPI, and I²C interfaces and operates from 2.95–5.5 V, targeting cost-sensitive industrial control and appliance timing applications.

For engineers reviewing the STM8S105K6B6 datasheet, STM8S105K6B6 pinout, STM8S105K6B6 application, or STM8S105K6B6 equivalent, key selection criteria include Flash endurance (10 kcycles), EEPROM retention (20 years at 55 °C), low-power modes (wait/active-halt/halt), 16-bit advanced control timer with dead-time insertion, and LQFP48 package compatibility.

Technical Context

The STM8S105K6B6 implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. Its clock system integrates four master sources: user-trimmable 16 MHz RC, 128 kHz low-power RC, crystal resonator, and external clock - all monitored by a clock security system.

Interrupt handling uses a nested controller supporting 32 interrupts and up to 37 external inputs across six vectors. Memory subsystem includes separate Flash (32 KB), true data EEPROM (1 KB, 300 kcycle endurance), and RAM (2 KB), with hardware SWIM debug interface and 96-bit unique ID for device authentication.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 48 pins, optimized for compact industrial PCB layouts and thermal reliability in convection-cooled environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S005K6T6, the STM8S105K6B6 provides guaranteed operation up to 125 °C and higher I/O sink strength; versus STM8L152K6U6, it delivers deterministic EEPROM writes and robust 20 mA I/O drive without power-mode trade-offs.

Availability

STM8S105K6B6 is available at Aetrix Electronics and suitable for motor control interface, smart appliance HMI, industrial PLC I/O modules, and energy metering subsystems requiring stable component supply across long-lifecycle industrial programs.

Supply support for STM8S105K6B6 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM8S series targets cost-optimized, high-reliability embedded control applications-emphasizing Flash/EPPROM longevity, robust I/O, and low-power operation in harsh environments.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM8S105K6B6 achieves 16 MHz maximum CPU frequency across its full 2.95–5.5 V supply range, verified per DS5855 Rev 16 Section 10.3.1. At 3.3 V, f_CPUmax remains 16 MHz; at 2.95 V, it is derated to 14 MHz per Figure 11. No external PLL is required-the 16 MHz RC oscillator is factory-trimmed and software-adjustable.

Does this MCU support in-system programming via SWIM, and what pins are required?

Yes, the STM8S105K6B6 supports full in-system programming and debugging via the Single-Wire Interface Module (SWIM) using only PD3 (SWIM) and VDD/VSS. No dedicated programming header is needed-SWIM operates at standard logic levels and requires no external voltage translation, enabling firmware updates through existing UART or I²C host interfaces with minimal pin overhead.

How is the 1 Kbyte data EEPROM organized, and what write endurance does it guarantee?

The 1 Kbyte data EEPROM is physically separate from Flash and organized as 512 × 16-bit words. It guarantees 300,000 write/erase cycles per word and 20-year data retention at 55 °C (DS5855 Rev 16 Section 4.4). Write operations are atomic and interruptible; hardware ECC is not implemented, but error detection relies on application-level checksums or duplication schemes.

Can the advanced control timer (TIM1) generate complementary PWM with programmable dead time?

Yes, TIM1 supports complementary PWM output on three pairs of channels (CH1/CH1N, CH2/CH2N, CH3/CH3N) with fully programmable dead-time insertion (0–255 × t_CLK) and flexible synchronization triggers. Dead-time values are loaded into the DTG register and applied automatically during edge transitions, preventing shoot-through in half-bridge and inverter gate drive applications without external logic.