What Is STM8S001J3?

The STM8S001J3 is an 8-bit microcontroller from STMicroelectronics' STM8S Value Line. It features a 16 MHz STM8 core, 8 KB Flash program memory, 1 KB RAM, and 128-byte true data EEPROM with up to 100,000 write/erase cycles. The MCU also integrates a 10-bit ADC, multiple timers, UART, SPI, I²C, watchdog timers, and up to 5 GPIOs, making it suitable for a range of compact embedded control applications.

The STM8S001J3 integrates several system-level functions to reduce external components and overall design cost. It supports a 2.95 V to 5.5 V operating voltage, internal clock oscillators, clock security monitoring, brown-out reset, and low-power modes. Its I/Os, independent watchdogs, and embedded SWIM interface for programming and non-intrusive debugging further support reliable embedded system designs.

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STM8S001J3 Specifications

This section lists the key specifications of the STM8S001J3M3TR MCU.

STM8S001J3 Key Features

Core

• 16 MHz advanced STM8 core with Harvard architecture and 3-stage pipeline

• Extended instruction set

Memories

• Program memory: 8-Kbyte Flash memory; data retention 20 years at 55 °C after 100 cycles

• RAM: 1 Kbyte

• Data memory: 128-byte true data EEPROM; endurance up to 100 k write/erase cycles

Clock, reset and supply management

• 2.95 V to 5.5 V operating voltage

• Flexible clock control, 3 master clock sources

– External clock input

– Internal, user-trimmable 16 MHz RC

– Internal low-power 128 kHz RC

• Clock security system with clock monitor

• Power management

– Low-power modes (wait, active-halt, halt)

– Switch-off peripheral clocks individually

– Permanently active, low-consumption power-on and power-down reset

Interrupt management

• Nested interrupt controller with 32 interrupts

• Up to 5 external interrupts

Timers

• Advanced control timer: 16-bit, 2 CAPCOM channels, 2 outputs, dead-time insertion and flexible synchronization

• 16-bit general purpose timer, with 3 CAPCOM channels (IC, OC or PWM)

• 8-bit basic timer with 8-bit prescaler

• Auto wakeup timer

• Window and independent watchdog timers

Communications interfaces

• UART, SmartCard, IrDA, LIN master mode

• SPI unidirectional interface up to 8 Mbit/s (master simplex mode, slave receiver only)

• I2C interface up to 400 Kbit/s Analog-to-digital converter (ADC)

• 10-bit ADC, ± 1 LSB ADC with up to 3 multiplexed channels, scan mode and analog watchdog

• Internal reference voltage measurement

I/Os

• Up to 5 I/Os including 4 high-sink outputs

• Highly robust I/O design, immune to current injection

Development support

• Embedded single-wire interface module (SWIM) or fast on-chip programming and non-intrusive debugging

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STM8S001J3 SO8N Pinout and Pin Description

The STM8S001J3M3TR is available in an SO-8N (8-pin) package.

Pin 2 (VSS/VSSA) provides digital and analog ground, while Pin 4 (VDD/VDDA) supports a main supply voltage of 2.95 V to 5.5 V.

Pin 3 (VCAP) is used to connect an external filtering capacitor for the internal core voltage regulator to ensure stable operation.

Pin 8 integrates the PD1/SWIM single-wire debugging interface and shares functions with SPI, timers, and other peripherals, so SWIM programming and debugging availability should be considered when using its alternate functions.

The remaining pins also support UART, I²C, SPI, 10-bit ADC, and TIM1/TIM2 peripherals through alternate functions, providing flexible interface configurations.

STM8S001J3 Communication Interfaces

The STM8S001J3 integrates a versatile set of serial communication interfaces, enabling seamless connectivity with external sensors, peripheral ICs, and host systems. Despite its compact SO8N package, the device supports UART, SPl, and I²C protocols through highly flexible pin multiplexing.

UART Interface

The full-featured UART interface supports asynchronous serial communication, LIN master mode, SmartCard, and IrDA protocols. It is commonly used for system debugging, AT command communication with wireless modules, or PC serial data transmission. In resource-constrained 8-pin applications, the UART_TX and UART_RX signals can be remapped to available GPIOs via

option bytes to optimize board layout.

SPI Interface

The high-speed Serial Peripheral Interface (SPI) supports master and slave modes with programmable clock polarity and phase, offering unidirectional data rates up to 8 Mbit/s. It is ideally suited for short-distance, high-throughput communication with SPI-based displays, external flash memories, and precision analog front-ends (AFEs).

I²C Interface

The integrated I2C bus controller operates at speeds up to 400 kbit/s (Fast Mode) and supports multi-master architectures along with standard 7-bit/10-bit addressing modes. This interface provides an efficient multi-device bus for connecting digital temperature sensors, EEPROMs, real-time clocks (RTCs), and power management ICs using minimal I/O pins.

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STM8S001J3 Low-Power Modes

The microcontroller provides three low-power modes: Wait Mode, Active-Halt Mode, and Halt Mode, allowing flexible selection based on system tasks and wake-up requirements.

l Wait Mode: The CPU stops running while peripherals can remain active.

l Active-Halt Mode: Further reduces power consumption while retaining wake-up capabilities, making it suitable for applications that require periodic responses.

l Halt Mode: Disables more system functions to achieve lower standby power consumption.

Proper use of these low-power modes can effectively reduce system power consumption during idle or standby periods.

STM8S001J3 Applications

The STM8S001J3 is designed for cost-sensitive embedded applications, making it well suited for small-scale control, status monitoring, simple communication, and low-cost automation systems.

1. Industrial Control

It can be used in small industrial control devices, control panels, actuator control systems, and simple automation modules for functions such as button detection, status control, timing, and basic data acquisition.

2. Home Appliances

It is suitable for products such as fans, lighting controllers, and small home appliance control boards. GPIOs, timers, the ADC, and low-power modes can be used for button, sensor, and load control.

3. Sensor and Data Acquisition

With a 10-bit ADC and up to three multiplexed analog channels, the STM8S001J3 can be used to collect analog signals such as temperature, light, and voltage, while UART, I²C, or SPI can be used for data communication with other devices.

4. Motor and Actuator Control

Its 16-bit timers and PWM-related functions support applications such as small DC motors, fans, and actuators, enabling basic speed or output control. The STM8S ecosystem also provides resources for motor control applications.

5. LED and Lighting Control

GPIOs, timers, and PWM can be used for LED dimming, brightness adjustment, status indication, and simple lighting control, making the MCU suitable for compact and cost-sensitive control boards.

6. Embedded Control Modules

With its compact SO-8 package, 8 KB Flash, 1 KB RAM, EEPROM, watchdog timers, and multiple communication interfaces, the STM8S001J3 can serve as the main control MCU in various compact electronic devices, especially high-volume and cost-sensitive products.

STM8S001J3 Package Information

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