STMicroelectronics STM8S105S6T6CTR

Overview

STM8S105S6T6CTR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash with 20-year data retention at 55 °C, 1 Kbyte true EEPROM (300 kcycle endurance), 10-bit ADC with 10-channel multiplexing, and integrated UART/SPI/I²C interfaces. It targets cost-sensitive industrial control, appliance HMI, and sensor node applications requiring robust I/O and low-power operation.

For engineers reviewing the STM8S105S6T6CTR datasheet, STM8S105S6T6CTR pinout, STM8S105S6T6CTR application, or STM8S105S6T6CTR equivalent, key selection criteria include its LQFP48 package, 38 I/Os (16 high-sink), 16 MHz max CPU frequency at 2.95–5.5 V, nested interrupt controller with 32 vectors, and SWIM single-wire debug interface.

Technical Context

The STM8S105S6T6CTR implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling efficient C code execution. Its clock system integrates four sources: external crystal, external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all monitored by a clock security system.

Memory architecture includes separate program Flash (32 Kbyte), true data EEPROM (1 Kbyte), and RAM (2 Kbyte), with hardware support for scan-mode ADC, advanced TIM1 with dead-time insertion, and dual 16-bit general-purpose timers (TIM2/TIM3) plus 8-bit basic timer (TIM4).

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 STM8S105S6T6CTR, STM8S003F3P6 trades memory and I/O for lower cost and size, while STM8L052C6T6 prioritizes sub-µA sleep current at the expense of drive capability - making the S105S6 ideal for mixed-signal industrial control needing both persistence and actuation.

Availability

STM8S105S6T6CTR is available at Aetrix Electronics and suitable for industrial motor control, home appliance HMI, sensor node controllers, and power supply monitoring requiring stable component supply and long-term manufacturability.

Supply support for STM8S105S6T6CTR 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 delivers cost-optimized 8-bit performance for mainstream embedded control, emphasizing robustness, ease of development, and seamless integration with ST's ecosystem of tools and libraries.

FAQ

What is the maximum operating frequency and voltage range for STM8S105S6T6CTR?

The STM8S105S6T6CTR operates at up to 16 MHz across a supply voltage range of 2.95 V to 5.5 V. Its internal 16 MHz RC oscillator is user-trimmable, and the maximum CPU frequency scales linearly with VDD per Figure 11 in DS5855 Rev 16 - delivering full 16 MHz performance at ≥3.3 V.

Does STM8S105S6T6CTR support in-circuit debugging and programming?

Yes - it features the Single Wire Interface Module (SWIM), enabling full in-circuit debugging and flash programming using only one dedicated pin (SWIM). No JTAG header or additional pins are required, simplifying PCB layout and reducing BOM cost.

How many I/O pins support high-sink capability, and what is the rating?

16 I/O pins (designated as "high sink" in the datasheet) support up to 100 mA sink current each, with a total package limit of 400 mA. This allows direct driving of LEDs, small relays, or MOSFET gate resistors without external buffers in industrial HMI and control applications.

Is there hardware support for autonomous analog monitoring without CPU intervention?

Yes - the integrated analog watchdog continuously compares ADC conversion results against user-defined upper/lower thresholds and triggers an interrupt or reset if violated. This enables fail-safe monitoring of critical analog signals like supply rails or sensor outputs without software polling.