STMicroelectronics STM8S105S4T6CTR

Overview

STM8S105S4T6CTR 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 (16-bit 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 STM8S105S4T6CTR datasheet, STM8S105S4T6CTR pinout, STM8S105S4T6CTR application, or STM8S105S4T6CTR equivalent, key selection considerations include its LQFP48 package, 38 I/Os (16 high-sink), integrated EEPROM endurance (300 kcycle), 2.95–5.5 V supply range, and SWIM single-wire debug interface compatibility.

Technical Context

The STM8S105S4T6CTR 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: external crystal, external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - 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 16 KB Flash (20-year data retention at 55 °C after 10 kcycles), 1 KB true data EEPROM (300 kcycle endurance), and 2 KB RAM - all mapped in a unified address space with hardware register overlays.

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 STM8S003F3P6, the STM8S105S4T6CTR adds EEPROM persistence and expanded I/O/timers for complex control; versus STM8L052C6T6, it trades ultra-low sleep current for higher performance and richer motor-control peripherals.

Availability

STM8S105S4T6CTR is available at Aetrix Electronics and suitable for industrial motor control, home appliance management, and sensor-based embedded systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for STM8S105S4T6CTR 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 targets cost-optimized, robust 8-bit control applications - emphasizing ease of use, integrated peripherals, and long-term availability for industrial and white-goods designs.

FAQ

What debug interface does the STM8S105S4T6CTR support?

The STM8S105S4T6CTR uses the Single-Wire Interface Module (SWIM), a proprietary ST debug and programming interface requiring only one dedicated pin (SWIM) and ground. It supports full in-circuit debugging, flash programming, and real-time variable monitoring without JTAG pins or additional hardware - compatible with ST-LINK/V2 and ST-LINK/V2-1 debuggers.

Does the STM8S105S4T6CTR include hardware CRC calculation?

No, the STM8S105S4T6CTR does not integrate a 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 bootloader integrity checks or communication frame validation.

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_SWCR register, allowing adjustment in ±1% steps across a ±8% total range. Calibration is typically performed once at production using an external reference clock or crystal oscillator, then stored in option bytes - achieving ±1% accuracy over temperature and voltage for applications where crystal-free operation is preferred.

What is the maximum allowed current per I/O pin in high-sink configuration?

In high-sink mode (available on PA, PB, and PC ports), each I/O pin supports up to 20 mA sink current continuously, with absolute maximum rating of 100 mA per pin for short-duration pulses. Total package sink current must not exceed 160 mA, and simultaneous high-sink operation on multiple pins requires careful thermal and voltage-drop analysis per Section 10.3.6 of the datasheet.