STM8S003F3U6 ST Mainstream Value Line 8-bit MCU 8KB Flash 16MHz CPU 10-bit ADC UFQFPN-20

STM8S003F3U6 Product Overview

The STM8S003F3U6 is a mainstream value line 8-bit MCU from STMicroelectronics, 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. On-chip peripherals include a 10-bit ADC (5 channels), 16-bit advanced control timer (4 CAPCOM channels, 3 complementary outputs with dead-time), 16-bit general-purpose timer, 8-bit basic timer, auto wakeup timer, dual watchdogs, and UART/SPI/I2C interfaces. Packaged in UFQFPN-20 (3×3 mm) with 16 I/Os, it operates from 2.95 V to 5.5 V over -40 °C to 85 °C. Ideal for industrial control, LED lighting, sensor modules, and cost-sensitive applications.

STM8S003F3U6 Core Features

Advanced Core: 16 MHz STM8 core, Harvard architecture, 3-stage pipeline, extended instruction set, up to 27 external interrupts Memory: 8 KB Flash, 1 KB RAM, 128-byte true EEPROM (100k write/erase cycles) 10-bit ADC: 5 channels, ±1 LSB accuracy, scan mode, analog watchdog Advanced Control Timer: 16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion General-Purpose Timer: 16-bit, 3 channels IC/OC/PWM; 8-bit basic timer with prescaler Auto Wakeup Timer: Wakeup from Active-halt mode Dual Watchdogs: Window watchdog + Independent watchdog Communication: UART (SmartCard/IrDA/LIN master), SPI up to 8 Mbit/s, I2C up to 400 Kbit/s Clock System: 4 master clock sources, clock security system with monitor High Reliability: Low-consumption POR/PDR, highly robust I/Os immune against current injection UFQFPN-20 Package: 3×3×0.6 mm, 0.5 mm pitch, 16 I/Os including high-sink outputs Wide Operating Range: 2.95 V to 5.5 V, -40 °C to 85 °C Development Support: SWIM single-wire debug, fast on-chip programming and non-intrusive debugging

STM8S003F3U6 Applications

Industrial Control: PLCs, sensor transmitters, RS-485 nodes, small actuators LED Lighting: Dimming control, RGB strips, switching power supplies Battery Management: Protection boards, fuel gauges, charge management Home Appliances: Induction/microwave oven panels, small appliance controllers Sensor Modules: Temperature/humidity/gas sensing, ADC + I2C/UART networking Consumer Electronics: Remote controls, electric toothbrushes, electronic toys Motor Control: Fans, pumps, small motors with complementary PWM and dead-time

STM8S003F3U6 Key Advantages

Ultra-Cost-Effective: 8 KB Flash + 1 KB RAM + 128 B true EEPROM + 10-bit ADC + 3 timers + multi-interface in a 3×3 mm package, minimizing BOM True EEPROM: 128-byte true data EEPROM with 100k cycles, no external memory needed Advanced Timer: 4 CAPCOM channels, 3 complementary outputs with dead-time for half-bridge/motor drive Ultra-Compact: 3×3 mm UFQFPN-20, ideal for space-constrained designs Highly Robust: 4 clock sources + clock security, low-consumption POR/PDR, robust I/Os Mature Ecosystem: STM8 classic architecture, rich resources, low-cost SWIM debug Stable Supply Chain: ST mainstream value line with massive global shipments

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FAQ:

1. What is the STM8S003F3U6 and its key specifications?
   The STM8S003F3U6 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. Housed in a tiny UFQFPN20 package (3 mm × 3 mm), it provides 16 I/O pins and operates over ‑40 °C to +85 °C. As part of the STM8S Value line, it is an ultra‑compact, cost‑effective solution for space‑constrained embedded projects.

2. How does the STM8S003F3U6 differ from the STM8S003F3P6?
   Electrically and functionally they are identical — same 8 KB Flash, 1 KB SRAM, 128 bytes EEPROM, and same peripherals. The only difference is the package: the F3U6 uses an ultra‑small UFQFPN20 (3×3 mm QFN) with 16 I/O pins, while the F3P6 comes in a TSSOP‑20 with 16 I/O pins. Choose the F3U6 when you need the smallest possible PCB footprint and your assembly process can handle QFN packages; choose the F3P6 for easy hand‑soldering and prototyping.

3. What is the difference between STM8S003F3U6 and STM8S103F3P6?
   The STM8S103F3P6 belongs to the STM8S Access line, while the S003F3U6 is from the Value line. Both have the same Flash (8 KB) and RAM (1 KB), but the EEPROM sizes differ: the S103F3P6 provides 640 bytes of EEPROM, whereas the S003F3U6 has 128 bytes. The S103 may also offer slightly better temperature stability. The S003F3U6 additionally comes in a much smaller UFQFPN20 (3×3 mm) package compared to the TSSOP‑20 of the S103F3P6, making it better for designs where PCB area is at a premium but only a small non‑volatile storage is needed.

4. Can the STM8S003F3U6 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 three‑phase BLDC motor control, 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 STM8S003F3U6 have?
   It features a 10‑bit successive‑approximation ADC. In the UFQFPN20 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 analog input count is well‑suited for basic sensor acquisition in compact designs.

6. How much memory does the STM8S003F3U6 have?
   It provides 8 KB of Flash program memory, 1 KB of SRAM, and 128 bytes of true data EEPROM. This memory configuration is ideal for compact applications such as simple sensor nodes, small appliances, and basic timers/controllers that need a small, reliable non‑volatile storage.

7. What package does the STM8S003F3U6 use and how many I/O pins are there?
   It comes in a UFQFPN20 package measuring only 3 mm × 3 mm with a lead pitch of 0.5 mm. It provides 16 general‑purpose I/O pins. This ultra‑compact QFN package is perfect for designs where board space is at a premium, such as wearables, miniature sensors, and high‑density IoT modules.

8. Can the STM8S003F3U6 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 STM8S003F3U6?
   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 STM8S003F3U6?
    With its ultra‑small 3×3 mm package, 5 V operation, and low cost, the STM8S003F3U6 is extremely popular in miniature wearables, compact IoT sensors, tiny home automation nodes, portable medical accessories, and space‑constrained consumer gadgets. It is the go‑to choice when every square millimeter of PCB matters but a proven 8‑bit core and essential peripherals are still required.