Overview

The STMicroelectronics STM8S105K4T3CTR is an 8-bit microcontroller from the STM8S family. It is designed to provide a balance of high performance, low power consumption, and a rich set of peripherals in a compact and cost-effective package. Operating at up to 16 MHz, the STM8S105K4T3CTR is ideal for a wide range of applications, including industrial control, automotive systems, consumer electronics, and portable devices. Its efficient design allows it to perform essential tasks with minimal power consumption, making it suitable for embedded systems where low energy usage and reliable performance are key.

Key Features

* Core: 8-bit STM8 core, capable of running at up to 16 MHz.
* Memory:

* 4 KB Flash memory for program storage.
* 1 KB SRAM for data storage.
* 128 bytes of EEPROM for non-volatile data storage.
* Operating Voltage: 2.95 V to 5.5 V.
* Package: TSSOP-20 (Thin Shrink Small Outline Package with 20 pins).
* GPIO: Up to 16 general-purpose I/O pins with multiplexed functions.
* Communication Interfaces:

* 1 × I2C interface for communication with peripherals.
* 1 × SPI interface for high-speed serial data transfer.
* 1 × USART interface for UART communication.
* 1 × 10-bit ADC with 8 channels for analog-to-digital conversion.
* Timers and Control Peripherals:

* 1 × 8-bit general-purpose timer.
* 2 × 16-bit timers for PWM and event counting.
* 1 × independent watchdog timer for system safety.
* Analog Features:

* 1 × 10-bit ADC with up to 8 input channels.
* 1 × internal voltage reference for accurate measurement.
* Low Power Features:

* Multiple low-power modes, including Sleep, Halt, and Active modes.
* Low-power Run mode for energy-efficient operation.
* Temperature Range: -40°C to +125°C (Industrial grade).

Functional Description

The STM8S105K4T3CTR microcontroller is built around an 8-bit STM8 core, which runs at a maximum frequency of 16 MHz. This makes it suitable for applications that require moderate processing power and low computational complexity. Its performance is ideal for systems where real-time control, simple data handling, and communication tasks are needed.

With 4 KB of Flash memory, the STM8S105K4T3CTR provides ample space for smaller programs and firmware. The microcontroller also comes with 1 KB of SRAM, ensuring that the system has sufficient memory to store temporary data during execution. Additionally, the 128 bytes of EEPROM are ideal for storing non-volatile settings, calibration data, or other information that must be retained during power cycles.

The STM8S105K4T3CTR offers a number of communication options. The I2C interface enables easy communication with peripherals like sensors, EEPROMs, and other embedded systems. The SPI interface is useful for high-speed serial data transfer, allowing the microcontroller to interface with displays, memory devices, or other processors. The USART interface provides standard UART communication, ideal for integrating with external communication modules such as Bluetooth, GPS, or GSM modules.

The microcontroller is equipped with a 10-bit ADC, which can sample up to 8 analog input channels. This is useful for applications where precision analog-to-digital conversion is required, such as sensor data acquisition and signal processing. The internal voltage reference enhances the ADC’s accuracy, ensuring reliable measurements in varying environmental conditions.

The STM8S105K4T3CTR includes several timers to support various control applications. The 8-bit general-purpose timer is used for generating time delays, event counting, and pulse width modulation (PWM). The 16-bit timers offer more precision and can be used for more complex control systems, including motor control or precise time-based events. Additionally, an independent watchdog timer ensures the microcontroller remains in a known, safe state in case of software malfunctions or errors.

One of the key strengths of the STM8S105K4T3CTR is its energy efficiency. The microcontroller supports multiple low-power modes such as Sleep, Halt, and Active modes. The Low-power Run mode allows the microcontroller to continue running essential tasks while minimizing power consumption, making it perfect for battery-operated systems and applications where low energy use is a critical requirement.

Electrical Specifications

* Supply Voltage (VDD): 2.95 V to 5.5 V
* Flash Memory: 4 KB
* SRAM: 1 KB
* EEPROM: 128 bytes
* Maximum CPU Frequency: 16 MHz
* ADC Resolution: 10-bit with up to 8 input channels
* Operating Current:

* Active mode: ~2.5 mA (typical at 16 MHz)
* Sleep mode: ~1 µA (typical)
* Halt mode: <1 µA
* GPIO Current: ±20 mA per I/O pin (maximum sourcing/sinking current)
* Temperature Range: -40°C to +125°C (Industrial grade)
* ESD Protection: Exceeds 2 kV (Human Body Model)

Timing and Performance

* Interrupt Latency: Typically 8 clock cycles for fast interrupt response.
* ADC Conversion Time: Typically 4 µs per channel at full resolution (10-bit).
* SPI Clock Speed: Up to 10 MHz.
* USART Bit Rate: Up to 9600 bps.
* I2C Clock Speed: Up to 400 kHz.
* Timer Resolution:

* 8-bit timer: Supports time delays, PWM, and event counting.
* 16-bit timers: Ideal for more precise timing applications and pulse width modulation.

Physical and Packaging Information

* Package Type: TSSOP-20 (Thin Shrink Small Outline Package)
* Package Dimensions: 6.4 mm × 6.4 mm with 0.65 mm lead pitch
* Pin Configuration: Multiplexed I/O pins with flexible assignments for digital, analog, and communication functions (GPIO, SPI, I2C, USART, etc.)
* Lead Finish: RoHS-compliant, lead-free finish
* Thermal Resistance:

* Junction to Ambient (R\_θJA): Approx. 80 °C/W (depends on PCB design and cooling solution)
* Junction to Case (R\_θJC): Approx. 30 °C/W

Applications

The STM8S105K4T3CTR microcontroller is well-suited for a wide range of embedded applications:

* Battery-Powered Devices: Ideal for applications that require long battery life, such as handheld gadgets, remote sensors, and IoT devices.
* Industrial Control: Suitable for low-cost automation systems, sensors, simple controllers, and process monitoring.
* Consumer Electronics: Can be used in household appliances, toys, remote controls, and personal devices.
* Automotive Electronics: Works well for automotive sensor systems, monitoring, and control tasks.
* Medical Devices: Used in portable medical equipment, monitoring systems, and health tracking devices.
* Home Automation: Can be integrated into smart home devices, including light control, temperature sensors, and smart plugs.

Advantages

The STM8S105K4T3CTR microcontroller offers several significant advantages:

* Low Power Consumption: With multiple low-power modes (Sleep, Halt, Active), the STM8S105K4T3CTR is optimized for applications where minimizing energy usage is crucial, such as in battery-operated devices.
* Compact Size: The TSSOP-20 package makes the STM8S105K4T3CTR ideal for space-constrained applications where a small footprint is needed.
* Cost-Effective: Offering good performance with a rich set of peripherals at a competitive price point, the STM8S105K4T3CTR provides a cost-effective solution for a wide range of applications.
* Versatile Communication Interfaces: With I2C, SPI, and USART, the STM8S105K4T3CTR is highly flexible and can easily interface with various external devices and peripherals.
* Simple and Reliable: The 8-bit STM8 core ensures ease of development and compatibility with existing software and tools, making it a reliable choice for embedded applications.

Summary

The STM8S105K4T3CTR is a compact and energy-efficient 8-bit microcontroller that is ideal for applications where low power consumption, small package size, and cost-effectiveness are essential. With 4 KB Flash, 1 KB SRAM, and 128 bytes of EEPROM, it provides ample memory for a wide range of embedded systems. Its versatile communication interfaces, low-power features, and multiple timers make it suitable for a variety of applications, including consumer electronics, industrial control, automotive systems, and battery-operated devices. The STM8S105K4T3CTR delivers high performance for simple control tasks while ensuring minimal power usage, making it an excellent choice for energy-sensitive embedded systems.