STMicroelectronics STM8S105K4U6ATR

Overview

STM8S105K4U6ATR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 16 KB Flash, 1 KB data EEPROM, 10-bit ADC with 10 channels, UART/SPI/I²C interfaces, and advanced timers including TIM1 with dead-time insertion. 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 STM8S105K4U6ATR datasheet, STM8S105K4U6ATR pinout, STM8S105K4U6ATR application, or STM8S105K4U6ATR equivalent, key selection criteria include Flash size (16 KB), EEPROM endurance (300 kcycle), LQFP48 package compatibility, 16 MHz max CPU frequency at 2.95–5.5 V supply, and integrated SWIM debug interface for rapid firmware iteration.

Technical Context

The STM8S105K4U6ATR implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. Its clock system integrates four sources - 16 MHz internal RC (user-trimmable), 128 kHz low-power RC, external crystal, and external clock - with clock security monitoring to prevent runtime failure.

Interrupt handling uses a nested controller supporting 32 vectors and up to 37 external interrupts across six priority levels. Memory subsystem includes true data EEPROM (1 KB, 300 kcycle endurance, 20-year retention at 55 °C) and SRAM (1 KB), both mapped into linear address space with hardware write protection.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6, the STM8S105K4U6ATR adds EEPROM persistence and higher I/O drive strength; versus STM8L151K4U6, it delivers superior active-mode performance and motor timing precision at the cost of higher active current.

Availability

STM8S105K4U6ATR is available at Aetrix Electronics and suitable for industrial motor control, smart appliance interface, and energy metering applications requiring stable component supply and long-term production support.

Supply support for STM8S105K4U6ATR 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 embedded control with emphasis on reliability, ease of development, and integration of peripherals like ADC, timers, and communication interfaces for appliance and industrial automation.

FAQ

What debug interface does STM8S105K4U6ATR support?

The STM8S105K4U6ATR uses the Single Wire Interface Module (SWIM), a proprietary ST debug and programming interface requiring only one dedicated pin (SWIM). It supports full-speed debugging, flash programming, and memory inspection without external debug probes - compatible with ST-LINK/V2 and third-party SWIM programmers.

Does STM8S105K4U6ATR include hardware CRC or encryption engines?

No. The STM8S105K4U6ATR does not integrate hardware CRC calculation units or cryptographic accelerators. It relies on software-based CRC-16/32 routines for data integrity checks. Security features are limited to option byte protection for Flash and EEPROM write/erase operations.

Can STM8S105K4U6ATR operate from a 3.3 V supply with full 16 MHz performance?

Yes. The device operates at 16 MHz across its full voltage range of 2.95 V to 5.5 V. At 3.3 V, typical current consumption in run mode is 4.2 mA (HSE 16 MHz), meeting specification requirements without derating - verified in Section 10.3.2 of DS5855 Rev 16.

Is the 1 KB data EEPROM accessible during code execution?

Yes. The STM8S105K4U6ATR supports concurrent read-while-write (RWW) operation for data EEPROM: while executing code from Flash, the EEPROM can be read or written using dedicated EEPROM control registers (FLASH_IAPSR, FLASH_DUKR), enabling real-time parameter updates without halting application logic.