STMicroelectronics STM8S105K6U6ATR

Overview

STM8S105K6U6ATR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash memory (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 low-power operation.

For engineers reviewing the STM8S105K6U6ATR datasheet, STM8S105K6U6ATR pinout, STM8S105K6U6ATR application, or STM8S105K6U6ATR equivalent, key selection criteria include its LQFP48 package compatibility, 2.95–5.5 V operating range, nested interrupt controller supporting 32 interrupts, and dual watchdog timers for safety-critical firmware supervision.

Technical Context

The STM8S105K6U6ATR implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, enabling efficient code density and deterministic timing. Its clock system integrates four master sources: external crystal, external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all monitored by a clock security system.

Peripheral integration includes an advanced 16-bit timer (TIM1) with dead-time insertion and complementary outputs for motor control, two general-purpose 16-bit timers (TIM2/TIM3), an 8-bit basic timer (TIM4), and auto-wakeup capability. The 10-bit ADC supports scan mode and analog watchdog, while communication peripherals operate at up to 8 Mbit/s (SPI), 400 kbit/s (I²C), and full-duplex UART with LIN master support.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature grade (–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 STM8S005K6T6C, the STM8S105K6U6ATR adds industrial temperature rating, VCAP support for stable core voltage, and double the Flash - justifying its use in certified industrial equipment. Versus STM8L152K6U6, it trades ultra-low-power sleep for richer motor control peripherals and higher ADC accuracy, making it optimal for active-duty embedded control.

Availability

STM8S105K6U6ATR is available at Aetrix Electronics and suitable for industrial motor control, smart appliance interface, and energy metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for STM8S105K6U6ATR 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 is ST's mainstream 8-bit MCU product line targeting cost-optimized, robust embedded control - emphasizing ease of migration from legacy 8051/AVR platforms while delivering enhanced peripheral integration and toolchain maturity.

FAQ

What is the maximum operating frequency and corresponding voltage requirement for the STM8S105K6U6ATR?

The STM8S105K6U6ATR achieves a maximum CPU frequency of 16 MHz across its full 2.95–5.5 V operating range. At 3.3 V, it maintains full 16 MHz performance without derating; at minimum 2.95 V, timing margins remain compliant per datasheet Table 18 (General Operating Conditions). This eliminates voltage-frequency scaling complexity in mixed-voltage designs.

Does the STM8S105K6U6ATR support in-system programming via SWIM, and what hardware is required?

Yes, the STM8S105K6U6ATR supports full in-system programming and debugging via the Single-Wire Interface Module (SWIM) on PB4. Only a standard ST-LINK/V2 or compatible debugger is required - no external bootloader or UART-based programming is needed. SWIM operates at VDD levels from 2.95 V to 5.5 V and supports read-out protection configuration.

How many I/O pins support high-sink capability, and what is the absolute maximum sink current per pin?

Exactly 16 I/O pins (PA0–PA7, PB0–PB7, PC0–PC1, PD0–PD1, PE0–PE5) are designated as high-sink outputs, each capable of sinking up to 20 mA continuously per ST's electrical characteristics (Table 38–40). Total simultaneous sink current must not exceed 80 mA (sum across all ports) to maintain VOL ≤ 0.4 V at VDD = 3.3 V, as specified in datasheet Section 10.3.6.

Is the integrated EEPROM accessible during normal program execution, and does it require special erase sequencing?

Yes, the 1 Kbyte data EEPROM is fully accessible during program execution - reads and writes can occur without halting the CPU. Writes require software-triggered erase-before-write sequencing per page (64-byte blocks), but the hardware handles timing and voltage generation automatically. No external high-voltage supply or manual timing delays are needed, as confirmed in Section 4.4 of the datasheet.