STMicroelectronics STM8S105K6U3ATR

Overview

STM8S105K6U3ATR 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 STM8S105K6U3ATR datasheet, STM8S105K6U3ATR pinout, STM8S105K6U3ATR application, or STM8S105K6U3ATR equivalent, key selection criteria include Flash/E²PROM endurance, 16 MHz timing stability across 2.95–5.5 V supply, LQFP48 package compatibility, and support for SWIM-based debugging in resource-constrained embedded designs.

Technical Context

The STM8S105K6U3ATR implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. Its clock system integrates four independent sources: user-trimmable 16 MHz RC, 128 kHz low-power RC, crystal resonator oscillator, and external clock input - all monitored by a clock security system.

Interrupt handling uses a nested controller supporting 32 interrupts and up to 37 external vectors across six priority levels. Memory subsystem includes unified Flash programming with option byte protection, dedicated data EEPROM with hardware write/erase control, and RAM mapped for fast peripheral register access and stack operations.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature grade (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S105K6U3ATR, STM8S003F3P6 sacrifices EEPROM, ADC channels, and timer capability for lower cost and smaller footprint, while STM8L152C6T6 trades off PWM timing resolution and high-sink I/O for extreme low-power operation - making the STM8S105K6U3ATR optimal for mixed-signal industrial control where Flash endurance, analog accuracy, and robust I/O coexist.

Availability

STM8S105K6U3ATR is available at Aetrix Electronics and suitable for industrial motor control, home appliance interface, building automation sensor nodes, and energy metering subsystems requiring stable component supply and long-term manufacturing continuity.

Supply support for STM8S105K6U3ATR 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 industrial control, appliance management, and sensor interface applications - emphasizing Flash reliability, analog integration, and debug simplicity in constrained environments.

FAQ

Is STM8S105K6U3ATR pin-compatible with other STM8S105 variants?

Yes - the STM8S105K6U3ATR shares identical LQFP48 pinout and electrical characteristics with STM8S105K4U3ATR and STM8S105K6T3TR. Differences are limited to Flash size (32 KB vs. 16 KB) and data EEPROM capacity (1 KB vs. 512 B), both implemented in same silicon die with mask-programmed options.

Does STM8S105K6U3ATR support in-circuit debugging without external hardware?

Yes - it features a built-in Single-Wire Interface Module (SWIM) accessible via a single bidirectional pin (SWIM). No JTAG header or external debugger is required; ST-LINK/V2 or compatible tools connect directly for full run-control, memory inspection, and breakpoint debugging.

What is the maximum ADC sampling rate achievable with STM8S105K6U3ATR?

The 10-bit ADC achieves up to 1 MSPS conversion rate when configured in continuous scan mode with prescaler = 0 and fCPU = 16 MHz. Real-world throughput is ~800 kSPS due to acquisition time and software overhead, sufficient for motor current sensing and thermal monitoring.

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_HSICALR register (8-bit calibration value). Factory-trimmed default accuracy is ±1%, and fine-tuning against an external reference can achieve ±0.5% across –40 °C to +85 °C with minimal code overhead.