STMicroelectronics STM8S103F2P3TR

Overview

STM8S103F2P3TR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 8 KB Flash, 640-byte data EEPROM, 10-bit ADC with 5 channels, UART/SPI/I²C interfaces, and three timers-including a 16-bit advanced control timer with dead-time insertion. It targets cost-sensitive industrial control, sensor interface, and appliance motor management applications.

For engineers reviewing the STM8S103F2P3TR datasheet, STM8S103F2P3TR pinout, STM8S103F2P3TR application, or STM8S103F2P3TR equivalent, key selection criteria include its TSSOP20 package, 2.95–5.5 V supply range, 300 kcycle EEPROM endurance, nested 32-interrupt controller, and SWIM single-wire debug interface for space-constrained embedded designs.

Technical Context

The STM8S103F2P3TR 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-managed by a clock security system with monitor.

Peripheral integration includes UART with SmartCard/IrDA/LIN master support, SPI up to 8 Mbit/s, I²C up to 400 kbit/s, and a 10-bit ADC with analog watchdog and scan mode. Power management supports wait, active-halt, and halt modes with individual peripheral clock gating for fine-grained energy control.

Key Specifications

Pinout & Package

TSSOP20 package (4.4 mm body width, 0.65 mm pitch), thermally enhanced for compact industrial PCB layouts; pin count and I/O mapping optimized for minimal external components in 20-pin footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6, the STM8S103F2P3TR delivers double Flash and EEPROM capacity plus advanced timer hardware-justifying its use in applications requiring field-updatable parameters and motor control. Versus EFM8BB10F8G-A-QFN20, it offers superior analog integration and guaranteed EEPROM reliability without external components.

Availability

STM8S103F2P3TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control, and energy meter interface applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature ranges.

Supply support for STM8S103F2P3TR 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM8S series targets cost-optimized, robust 8-bit control in space- and power-constrained environments-emphasizing ease of use, integrated peripherals, and long-term availability for industrial equipment lifecycles.

FAQ

Does STM8S103F2P3TR support in-system programming via SWIM?

Yes. The STM8S103F2P3TR uses the Single-Wire Interface Module (SWIM) for in-system programming and debugging. A single dedicated pin (SWIM) enables full flash programming, RAM inspection, and real-time breakpoint debugging using ST-LINK/V2 or compatible programmers-no additional pins or bootloaders required.

What is the maximum operating frequency at 3.3 V supply?

At VDD = 3.3 V, the STM8S103F2P3TR supports a maximum CPU frequency of 16 MHz when using the internal 16 MHz RC oscillator (after user trimming) or an external clock source. Electrical characteristics confirm fCPUmax remains 16 MHz across the full 2.95–5.5 V operating range.

Can the 10-bit ADC measure negative voltages or accept bipolar inputs?

No. The ADC input range is strictly 0 V to VDD (unipolar). Inputs below 0 V or above VDD risk damage or invalid conversion results. External signal conditioning-such as level-shifting or clamping-is required for bipolar or out-of-range analog signals before connection to ADC channels.

Is the data EEPROM accessible during program execution?

Yes. The 640-byte data EEPROM supports read-while-write (RWW) operation: reads can occur concurrently with Flash or EEPROM writes. This allows real-time parameter logging (e.g., fault counters or calibration offsets) without halting application code execution.