STM8S003K3T6C ST Mainstream Value Line 8-bit MCU 8KB Flash 16MHz CPU 10-bit ADC LQFP-32

STM8S003K3T6C Product Overview

The STM8S003K3T6C is a mainstream value line 8-bit MCU from STMicroelectronics, classified as a low-density device in the STM8S family reference manual (RM0016). Featuring a 16 MHz STM8 core with Harvard architecture and 3-stage pipeline, it integrates 8 KB Flash, 1 KB RAM, and 128-byte true data EEPROM (up to 100k write/erase cycles). On-chip peripherals include a 10-bit ADC (5 channels with scan mode and analog watchdog), 16-bit advanced control timer (4 CAPCOM channels, 3 complementary outputs with dead-time insertion), 16-bit general-purpose timer, 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 mm) with 28 I/Os (including 21 high-sink outputs), it operates from 2.95 V to 5.5 V over -40 °C to 85 °C. Ideal for industrial control, LED lighting, sensor modules, consumer electronics, and cost-sensitive applications requiring robust performance.

STM8S003K3T6C Core Features

Advanced Core: 16 MHz STM8 core, Harvard architecture, 3-stage pipeline, extended instruction set, up to 27 external interrupts on 6 vectors Memory: 8 KB Flash (20-year data retention at 55 °C after 100 cycles), 1 KB RAM, 128-byte true data EEPROM (up to 100k write/erase cycles) 10-bit ADC: 5 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 Timer: 16-bit, 3 CAPCOM channels (IC, OC or PWM); 8-bit basic timer with 8-bit prescaler Auto Wakeup Timer: Wakeup from Active-halt mode Dual Watchdogs: Window watchdog + Independent watchdog 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, clock security system with clock monitor High Reliability: Low-consumption POR/PDR, highly robust I/O design immune against current injection LQFP-32 Package: 7×7 mm, 28 I/Os including 21 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

STM8S003K3T6C 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)

STM8S003K3T6C Key Advantages

Ultra-Cost-Effective: 8 KB Flash + 1 KB RAM + 128 B true EEPROM + 10-bit ADC + 3 timers + UART/SPI/I2C in LQFP-32 package, minimizing BOM cost True EEPROM: 128-byte true data EEPROM with 100k write/erase cycles, reliably storing calibration parameters without external memory ICs 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: 28 I/Os with 21 high-sink outputs, meeting complex peripheral connectivity needs Robust & Reliable: 4 clock sources + clock security system, low-consumption POR/PDR, highly robust I/Os for stable industrial operation Mature Ecosystem: STM8 classic architecture, rich documentation, low-cost SWIM debug, shortening development cycles Stable Supply Chain: STMicroelectronics mainstream value line with massive global shipments, ensuring stable supply

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FAQ:

1. What is the STM8S003K3T6C and its key specifications?
   The STM8S003K3T6C is an 8‑bit microcontroller from STMicroelectronics based on the STM8 core at up to 16 MHz. It provides 8 KB of Flash program memory, 1 KB of SRAM, and 128 bytes of true data EEPROM. On‑chip peripherals include a 10‑bit ADC, a 16‑bit advanced timer (TIM1, without complementary outputs), general‑purpose timers (TIM2, TIM4), and communication interfaces: UART, SPI, I2C. It is housed in an LQFP‑32 package with 28 I/O pins and operates over ‑40 °C to +85 °C. As part of the STM8S Value line, it is a popular, ultra‑cost‑effective choice for simple embedded applications.

2. How does the STM8S003K3T6C differ from the STM8S103K3T6C?
   Both are pin‑compatible and share the same Flash (8 KB), RAM (1 KB), and peripherals. The main difference lies in the EEPROM size: the S003K3T6C provides 128 bytes of true EEPROM, while the S103K3T6C offers a larger 640‑byte EEPROM. The S103 also typically has slightly better electrical characteristics and temperature stability. For applications that only need to store a few calibration constants, the S003 is the most cost‑optimized option; choose the S103 if you require frequent or larger parameter storage.

3. What is the difference between STM8S003K3T6C and STM8S105K4T6C?
   The STM8S105K4T6C is a higher‑performance device. It offers 16 KB of Flash and 2 KB of SRAM (vs. 8 KB/1 KB on the S003), and its advanced timer TIM1 provides 3 complementary PWM pairs for direct brushless DC motor control. The S003K3T6C’s TIM1 does not have complementary outputs. Both share the same LQFP‑32 package with 28 pins. Choose the S105 when you need more memory and three‑phase motor drive; the S003 is ideal for basic sensing, simple PWM, and general‑purpose control where cost is critical.

4. Can the STM8S003K3T6C drive a brushless DC motor?
   No. Although it includes an advanced timer TIM1, this version does not generate complementary PWM outputs with dead‑time insertion. It can produce up to four independent PWM channels, which are suitable for controlling DC motors, servos, LED dimming, or simple switching converters. For a three‑phase BLDC motor, you must use an external gate driver with built‑in dead‑time or choose a microcontroller like the STM8S105 or STM8S207 that has a full complementary TIM1.

5. What are the ADC specifications and how many analog channels does the STM8S003K3T6C have?
   It features a 10‑bit successive‑approximation ADC. In the LQFP‑32 package, up to 5 external analog input channels (AIN0 through AIN4) are typically available, as the pins are shared with digital I/Os. The ADC can also measure an internal voltage reference. This limited analog input count is typical for an entry‑level 8‑bit MCU; plan your sensor connections accordingly.

6. How much memory does the STM8S003K3T6C have?
   It provides 8 KB of Flash program memory, 1 KB of SRAM, and 128 bytes of true data EEPROM. This memory configuration is well‑suited for compact applications such as simple sensor nodes, small appliances, and basic timers/controllers that do not require large code or data storage.

7. What package does the STM8S003K3T6C 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, making it popular for prototyping and low‑ to medium‑volume production.

8. Can the STM8S003K3T6C 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, which simplifies interfacing with legacy TTL and CMOS logic.

9. How to program and debug the STM8S003K3T6C?
   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 to speed up development.

10. What are the most typical applications of the STM8S003K3T6C?
    Thanks to its ultra‑low cost, 5 V operation, and compact LQFP‑32 package, the STM8S003K3T6C is extremely popular in small home appliances, toys, simple sensor nodes, battery chargers, LED controllers, and general‑purpose 8‑bit control. It is widely used in both high‑volume consumer products and hobbyist projects where a robust, easy‑to‑use MCU is required without complex peripherals.