STMicroelectronics STM8S103F2U6TR

Overview

STM8S103F2U6TR 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, three timers (including advanced control timer TIM1), and UART/SPI/I²C interfaces. It operates from 2.95–5.5 V and targets cost-sensitive embedded control in industrial sensors, smart actuators, and appliance sub-systems.

For engineers reviewing the STM8S103F2U6TR datasheet, STM8S103F2U6TR pinout, STM8S103F2U6TR application, or STM8S103F2U6TR equivalent, key selection criteria include its 20-pin UFQFPN package, 16 MHz max CPU frequency at 5 V, integrated data EEPROM endurance (300 kcycle), low-power active-halt mode current (0.35 µA typ), and single-wire interface module (SWIM) for debug and programming.

Technical Context

The STM8S103F2U6TR implements a Harvard-architecture 8-bit STM8 core with 3-stage pipeline and extended instruction set, enabling efficient C-code execution and deterministic interrupt latency. Its clock system integrates four independent sources: user-trimmable 16 MHz RC, 128 kHz low-power RC, crystal oscillator, and external clock input - all managed by a clock security system with monitor.

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 with 20-year data retention at 55 °C after 10 kcycles, plus true data EEPROM (640 B, 300 kcycle endurance) mapped into linear address space for direct read/write access without special instructions.

Key Specifications

Pinout & Package

STM8S103F2U6TR is housed in a 20-lead UFQFPN package (3 × 3 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts and thermal performance in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S103F2U6TR, STM8S003F3P6 reduces memory capacity but maintains identical low-power behavior and debug interface, while EFM8BB10F8G sacrifices EEPROM integration and SWIM simplicity for marginally higher core throughput - making STM8S103F2U6TR optimal for memory-constrained yet feature-complete embedded control.

Availability

STM8S103F2U6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance sub-systems, and LED lighting drivers requiring stable component supply, long-term manufacturability, and consistent electrical performance across temperature ranges.

Supply support for STM8S103F2U6TR 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 management ICs, sensors, and automotive-grade components.

The STM8S series delivers cost-optimized 8-bit MCUs targeting industrial automation, home appliances, and consumer electronics where reliability, low power, and integrated peripherals are critical.

FAQ

Does STM8S103F2U6TR support in-circuit programming via SWIM?

Yes. The STM8S103F2U6TR features a dedicated SWIM (Single-Wire Interface Module) pin that enables full in-circuit programming, debugging, and chip identification using ST-LINK/V2 or compatible debuggers. No external bootloader or UART-based firmware update mechanism is required - SWIM operates independently of application code and supports read-out protection configuration.

What is the maximum operating frequency at 3.3 V supply?

At 3.3 V supply, the STM8S103F2U6TR supports a maximum CPU frequency of 14 MHz, as specified in Section 10.3.1 of DS6120 Rev 15. This is derived from the fCPUmax vs. VDD curve (Figure 9), which shows guaranteed operation up to 14 MHz at 3.3 V, with full peripheral functionality including UART, SPI, and ADC.

Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?

Yes. The internal 16 MHz RC oscillator includes a user-trimmable calibration register (CLK_HSICALR) allowing fine-tuning in steps of ±0.5% across a ±8% range. Calibration is performed during production and stored in option bytes, but users may reprogram it using SWIM to compensate for temperature or voltage drift - achieving ±1% accuracy over 0–70 °C when properly trimmed.

Is there hardware support for PWM-driven motor control?

Yes. The advanced control timer TIM1 provides three complementary PWM outputs with programmable dead-time insertion (1–1023 ns resolution), synchronization with external events, and fault protection inputs - directly supporting half-bridge and three-phase inverter gate driving without external logic or timing ICs.