STMicroelectronics STM8S103F3U6ATR

Overview

STM8S103F3U6ATR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 8 Kbyte Flash program memory, 640 byte data EEPROM, 10-bit ADC with 5 channels, UART/SPI/I²C interfaces, and three timers-including advanced control timer TIM1 with dead-time insertion. It targets cost-sensitive embedded control in industrial sensors and appliance motor management.

For engineers reviewing the STM8S103F3U6ATR datasheet, STM8S103F3U6ATR pinout, STM8S103F3U6ATR application, or STM8S103F3U6ATR equivalent, key selection criteria include its 20-pin UFQFPN package, 2.95–5.5 V supply range, integrated SWIM debug interface, and support for LIN master mode via UART-critical for automotive body electronics and smart home actuators.

Technical Context

The STM8S103F3U6ATR implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution at up to 16 MHz. Its clock system integrates four sources: user-trimmable 16 MHz RC, low-power 128 kHz RC, crystal resonator, and external clock input-with clock security monitoring to detect failure and trigger reset.

Interrupt handling uses a nested controller supporting 32 vectors and up to 27 external interrupts across six priority levels. Memory subsystem includes 8 Kbyte Flash (20-year data retention at 55 °C after 10 kcycles) and true data EEPROM (300 kcycle endurance), both accessible via single-wire SWIM interface for in-system programming and debugging.

Key Specifications

Pinout & Package

STM8S103F3U6ATR is housed in a 20-lead UFQFPN package (3 × 3 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts in consumer and industrial modules. Pin functions are validated per ST's DS6120 Rev 15 datasheet Section 5.2.2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with STM8S003F3P6, STM8S103F3U6ATR adds hardware dead-time and LIN master support essential for motor drives and automotive links; versus EFM8BB10F8G-A-QFN20, it provides integrated EEPROM and wider supply range at the cost of higher active current.

Availability

STM8S103F3U6ATR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance motor control, automotive body electronics, and consumer IoT actuator modules requiring stable component supply across multi-year production cycles.

Supply support for STM8S103F3U6ATR 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM8S series delivers cost-optimized 8-bit MCUs targeting resource-constrained embedded control applications-emphasizing robustness, ease of development, and long-term availability for industrial automation and white goods.

FAQ

Does STM8S103F3U6ATR support in-system programming via SWIM?

Yes. The device features a dedicated SWIM (Single-Wire Interface Module) pin enabling full in-circuit programming, debugging, and memory inspection using ST-LINK/V2 or compatible debuggers. No bootloader code is required-programming occurs directly through the SWIM interface with standard ST toolchains.

What is the maximum ADC sampling rate achievable on STM8S103F3U6ATR?

The 10-bit ADC supports up to 1 MSPS conversion rate when using the internal 16 MHz RC oscillator and configured in single-shot mode with no prescaler. Actual throughput depends on channel count and scan mode setup; typical effective rate is ~100 kSPS for 5-channel continuous scan with digital filtering enabled.

Can TIM1 generate complementary PWM signals with programmable dead-time?

Yes. TIM1 is a 16-bit advanced control timer with three complementary output channels and hardware-configurable dead-time insertion (1–128 clock cycles). Dead-time is applied automatically between complementary pairs, preventing shoot-through in H-bridge or 3-phase inverter gate drivers without CPU intervention.

Is the 640 byte data EEPROM accessible during normal program execution?

Yes. The true data EEPROM supports concurrent read/write operations: while executing code from Flash, the CPU can read from or write to EEPROM locations. Write operations take ~4.5 ms per byte and are interruptible; erase of a 128-byte page requires separate command and completes in ~20 ms.