STM8S105K4T6C ST Mainstream Access Line 8-bit MCU 16KB Flash 16MHz CPU 10-bit ADC 1KB EEPROM LQFP-32

STM8S105K4T6C Product Overview

The STM8S105K4T6C is a mainstream access line 8-bit MCU from STMicroelectronics, classified as a medium-density device in the STM8S family reference manual (RM0016). Featuring a 16 MHz advanced STM8 core with Harvard architecture and 3-stage pipeline, it delivers up to 20 MIPS processing capability. It integrates 16 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 (7 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-32 (7×7×1.4 mm) with 25 I/Os 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, sensor modules, consumer electronics, automotive applications, and cost-sensitive embedded solutions.[reference:21][reference:22]

STM8S105K4T6C 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: 16 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: 7 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-32 Package: 7×7×1.4 mm, 25 I/Os 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

STM8S105K4T6C Applications

Industrial Control: PLCs, sensor transmitters, RS-485 communication nodes, small actuator control; wide temperature reliability 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 32-pin solution Motor Control: Fans, pumps, small motors; advanced timer with complementary PWM and dead-time Automotive Electronics: Vehicle light control, window anti-pinch, automotive sensor nodes (non-safety-critical)

STM8S105K4T6C 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: 16 KB Flash + 2 KB RAM + 1 KB true EEPROM + 10-bit ADC (7 channels) + multiple timers + UART/SPI/I2C in LQFP-32 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: 25 I/Os with 5V tolerance, meeting peripheral connectivity needs 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 STM8S105K4T6C and its key specifications?
   The STM8S105K4T6C is an 8‑bit microcontroller from STMicroelectronics based on the STM8 core at up to 16 MHz. It provides 16 KB of Flash program memory, 2 KB of SRAM, and 1 KB of true data EEPROM. Key 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‑32 package, it provides 28 I/O pins and operates over ‑40 °C to +85 °C. It does not include a CAN controller, making it a cost‑effective, easy‑to‑solder solution for motor control and sensor applications.

2. How does the STM8S105K4T6C differ from the STM8S105K6T6C?
   Both share the same LQFP‑32 package, peripherals, and memory sizes except for Flash. The K6T6C doubles the Flash from 16 KB (K4) to 32 KB, while SRAM (2 KB) and EEPROM (1 KB) remain identical. Both feature TIM1 with three complementary PWM pairs and lack a CAN interface. Choose the K4T6C when 16 KB of code space is sufficient and cost is a priority; choose the K6T6C if you need room for larger firmware or future updates.

3. What is the difference between STM8S105K4T6C and STM8S105K4U6A?
   Electrically and functionally they are identical — same 16 KB Flash, 2 KB SRAM, 1 KB EEPROM, identical peripherals (including TIM1), and same I/O count (28 pins). The only difference is the package: the K4T6C uses an LQFP‑32 (7 mm × 7 mm, 0.8 mm pitch) that is easy to hand‑solder and prototype with, while the K4U6A comes in a tiny UFQFPN32 (5×5 mm QFN) for ultra‑compact boards. Pick the K4T6C for manual assembly and debugging convenience; pick the K4U6A when board space is extremely limited.

4. Does the STM8S105K4T6C have a CAN bus interface?
   No. The STM8S105K4T6C does not include a CAN controller. It is designed for applications that need robust motor control and general‑purpose communication (UART, SPI, I2C) without automotive or industrial CAN networks. If CAN is required, consider the STM8S207 or STM8S208 series.

5. Can the STM8S105K4T6C drive a brushless DC motor directly?
   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.

6. What are the ADC specifications of the STM8S105K4T6C? How many analog channels are available?
   It features a 10‑bit successive‑approximation ADC. Internally the ADC supports up to 16 multiplexed analog input channels. In the 32‑pin LQFP package, depending on digital pin configuration, typically 7 to 10 external analog channels are accessible. The ADC can also measure an internal voltage reference and can be triggered by TIM1 for synchronized current sensing.

7. How much memory does the STM8S105K4T6C have?
   It provides 16 KB of Flash program memory, 2 KB of SRAM, and 1 KB of true data EEPROM. This memory configuration is well‑suited for compact motor‑control algorithms, simple communication stacks, and sensor acquisition tasks.

8. What package does the STM8S105K4T6C use and how many I/O pins are there?
   It comes in an LQFP‑32 package (7 mm × 7 mm, 0.8 mm lead pitch) and provides 28 general‑purpose I/O pins. The gull‑wing leads are easy to hand‑solder and visually inspect, making it a favorite for prototyping and small‑ to medium‑volume production.

9. Can the STM8S105K4T6C 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 you can power it directly from a standard 5 V rail, USB, or a loosely regulated supply. All I/O pins are 5 V tolerant, simplifying interfaces with legacy TTL and CMOS logic.

10. How to program and debug the STM8S105K4T6C? What are its typical applications?
    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, and ST provides standard peripheral libraries. Typical applications include home appliances, compact motor drives (fans, pumps, power tools), industrial sensors, power supplies, and general‑purpose 8‑bit control. Its combination of three‑phase motor control, 5 V operation, and easy‑to‑solder LQFP‑32 package makes it a popular choice for cost‑sensitive embedded designs.