STM8S105S6T6C ST Mainstream Access Line 8-bit MCU 32KB Flash 16MHz CPU 10-bit ADC 1KB EEPROM LQFP-44

STM8S105S6T6C Product Overview

The STM8S105S6T6C is a mainstream access line 8-bit MCU from STMicroelectronics, classified as a medium-density device in the STM8S105x4/6 access line. Featuring a 16 MHz advanced STM8 core with Harvard architecture and 3-stage pipeline with extended instruction set, it delivers up to 20 MIPS processing capability. It integrates 32 KB Flash program memory, 2 KB RAM, and 1 KB true data EEPROM (endurance: 300k write/erase cycles — 3x the typical industry standard). On-chip peripherals include a 10-bit ADC (9 channels with scan mode and analog watchdog), 16-bit advanced control timer (4 CAPCOM channels, 3 complementary outputs with dead-time insertion), two 16-bit general-purpose timers (total 5 CAPCOM channels), 8-bit basic timer, auto wakeup timer, window and independent watchdog timers, and UART (with clock output for synchronous operation, SmartCard, IrDA, LIN master mode), SPI (up to 8 Mbit/s), and I2C (up to 400 Kbit/s) interfaces. Packaged in LQFP-44 (10×10×1.4 mm) with 34 I/Os (including 15 high-sink outputs) and highly robust I/O design immune against current injection, it operates from 2.95 V to 5.5 V over -40 °C to 85 °C. Ideal for industrial control, automotive dashboard applications, sensor modules, and cost-sensitive embedded solutions.

STM8S105S6T6C Core Features

Advanced Core: 16 MHz STM8 core, Harvard architecture, 3-stage pipeline, extended instruction set, up to 20 MIPS, up to 37 external interrupts, 32 nested interrupts Memory: 32 KB Flash (20-year data retention at 55 °C after 10k cycles), 2 KB RAM, 1 KB true data EEPROM (300k write/erase cycles) 10-bit ADC: 9 multiplexed channels, ±1 LSB accuracy, scan mode and analog watchdog Advanced Control Timer: 16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization General-Purpose Timers: 2x 16-bit, total 5 CAPCOM channels (IC/OC/PWM); 8-bit basic timer with 8-bit prescaler Auto Wakeup Timer: Wakeup from Active-halt mode Dual Watchdogs: Window watchdog + Independent watchdog with separate clock source Communication Interfaces: UART with clock output for synchronous operation, SmartCard, IrDA, LIN master mode; SPI up to 8 Mbit/s; I2C up to 400 Kbit/s Clock System: 4 master clock sources (external clock, crystal oscillator, user-trimmable 16 MHz RC, low-power 128 kHz RC), clock security system with monitor Low-Power Modes: Wait, Active-halt, Halt; individually switchable peripheral clocks High Reliability: Low-consumption POR/PDR, highly robust I/O design immune against current injection, 96-bit unique ID per device LQFP-44 Package: 10×10×1.4 mm, 34 I/Os including 15 high-sink outputs Wide Operating Range: 2.95 V to 5.5 V, -40 °C to 85 °C Development Support: Embedded SWIM single-wire interface for fast on-chip programming and non-intrusive debugging

STM8S105S6T6C Applications

Industrial Control: PLCs, sensor transmitters, RS-485 communication nodes, small actuator control; wide temperature reliability Automotive Dashboard Control: Mid-to-low-end vehicle instrument clusters, in-vehicle information display units LED Lighting: Dimming control, RGB strips, switching power supplies; direct PWM drive Battery Management: Protection boards, fuel gauges, charge management; low-power modes reduce standby consumption Home Appliances: Induction/microwave oven panels, small appliance main controllers Sensor Modules: Temperature/humidity/gas sensing; 10-bit ADC + I2C/UART flexible networking Consumer Electronics: Remote controls, electric toothbrushes, electronic toys; high-value 44-pin solution Motor Control: Fans, pumps, small motors; advanced timer with complementary PWM and dead-time

STM8S105S6T6C Key Advantages

300k High-Endurance EEPROM: 1 KB true data EEPROM with 300k write/erase cycles (3x standard endurance), reliably storing calibration parameters and operation logs without external memory ICs 20 MIPS High Performance: 16 MHz STM8 core with Harvard architecture and 3-stage pipeline, delivering up to 20 MIPS for complex control algorithms Ultra-Cost-Effective: 32 KB Flash + 2 KB RAM + 1 KB true EEPROM + 10-bit ADC (9 channels) + multiple timers + UART/SPI/I2C in LQFP-44 package, minimizing BOM cost Advanced Timer for Motor Control: 4 CAPCOM channels, 3 complementary outputs with dead-time insertion, driving half-bridge circuits and motor control Rich I/O Resources: 34 I/Os with 15 high-sink outputs, meeting complex peripheral connectivity needs Automotive-Grade Applicability: LQFP-44 package, wide operating voltage range, highly robust I/O design suitable for automotive dashboard applications Robust & Reliable: 4 clock sources + clock security system, low-consumption POR/PDR, independent watchdog with separate clock source Mature Ecosystem: STM8 classic architecture, rich documentation, low-cost SWIM debug, shortening development cycles Stable Supply Chain: STMicroelectronics mainstream access line with massive global shipments, ensuring stable supply

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FAQ:

1. What is the STM8S105S6T6C and its key specifications?
   The STM8S105S6T6C is an 8‑bit microcontroller from STMicroelectronics based on the STM8 core at up to 16 MHz. It provides 32 KB of Flash, 2 KB of SRAM, and 1 KB of true data EEPROM. On‑chip peripherals include a 10‑bit ADC, an advanced control timer (TIM1) with 3 complementary PWM pairs, general‑purpose timers (TIM2, TIM4), and communication interfaces: UART, SPI, I2C. Housed in an LQFP‑44 package, it offers 34 I/O pins and operates from ‑40 °C to +85 °C. Unlike the S207 series, it does not include a CAN controller, making it a cost‑optimized choice for applications that need motor‑control but not networking.

2. How does the STM8S105S6T6C differ from the STM8S207S8T6C?
   Both are high‑performance STM8 devices with similar core speed and advanced TIM1 motor‑control timers. The key differences: the S207S8T6C has 64 KB Flash, 6 KB SRAM, 2 KB EEPROM, and a CAN 2.0B interface. The S105S6T6C offers 32 KB Flash, 2 KB SRAM, 1 KB EEPROM, and no CAN. Both come in an LQFP‑44 package with 34 I/O pins. Choose the S105 for simpler, cost‑sensitive motor drives and sensor nodes that don’t need CAN; choose the S207 for larger code, more RAM, and CAN networking.

3. Does the STM8S105S6T6C have a motor‑control timer? Can it drive a brushless DC motor?
   Yes. The advanced timer TIM1 provides 3 complementary PWM pairs with programmable dead‑time insertion and a break input. This allows the MCU to directly control a three‑phase inverter or a BLDC motor half‑bridge without external dead‑time logic. It is widely used in fans, pumps, power tools, and home appliances.

4. What are the ADC specifications of the STM8S105S6T6C? How many analog channels are available?
   It features a 10‑bit successive‑approximation ADC. In the LQFP‑44 package, up to 16 internal multiplexed channels are supported, with typically 10 to 12 external channels depending on digital pin usage. The ADC can measure an internal voltage reference and can be triggered by TIM1 for synchronized current sampling.

5. How much memory does the STM8S105S6T6C have?
   It provides 32 KB of Flash program memory, 2 KB of SRAM, and 1 KB of true data EEPROM. This is a well‑balanced configuration for many 8‑bit applications, including motor‑control algorithms and simple communication stacks.

6. What package does the STM8S105S6T6C use and how many I/O pins are there?
   It comes in an LQFP‑44 package (10 mm × 10 mm, 0.8 mm lead pitch) and provides 34 general‑purpose I/O pins. This package offers a good compromise between compact size and connectivity for mid‑complexity designs.

7. Can the STM8S105S6T6C be powered directly from 5 V?
   Yes, it is a true 5 V‑capable microcontroller. The operating voltage range is 2.95 V to 5.5 V, so it can be powered directly from a standard 5 V rail, USB, or a loosely regulated supply. All I/O pins are 5 V tolerant.

8. How to program and debug the STM8S105S6T6C?
   Programming and debugging use the single‑wire SWIM interface. A low‑cost ST‑LINK/V2 is the standard tool. Firmware can be developed with STVD + Cosmic C or the open‑source SDCC compiler. ST provides standard peripheral libraries to accelerate development.

9. What is the difference between the STM8S105S6T6C and STM8S105K4T6C?
   Both belong to the STM8S105 series, but the K4T6C has 16 KB Flash, 2 KB SRAM, and 1 KB EEPROM in an LQFP‑32 package with 28 I/O pins. The S6T6C doubles the Flash to 32 KB and provides more I/O (34 vs 28) in a larger LQFP‑44 package. Both lack CAN and feature the same TIM1 motor‑control timer. Choose the S6T6C when you need more code space and additional I/O lines.

10. What are the most typical applications of the STM8S105S6T6C?
    It is widely used in home appliances (washing machines, dishwashers), industrial sensors, motor drives (fans, pumps, power tools), power supplies, and general‑purpose 8‑bit control. Its robust 5 V operation, three‑phase motor timer, and generous 34 I/Os make it a reliable choice for cost‑sensitive embedded designs that do not require CAN networking.