STM8S903K3T6 - 8-bit MCU, 8KB Flash, 16MHz | STMicroelectronics
部品番号: STM8S903K3T6 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.93 | $19.30 |
| 100 | $1.72 | $172.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.38 | $1,380.00 |
STM8S903K3T6 概要
An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit central processing unit (CPU), memory, and programmable input/output peripherals. It is the foundational building block in the hierarchy of embedded systems, sitting below 16-bit and 32-bit MCUs in processing power but offering lower cost, lower power consumption, and simpler programming. The STM8S903K3T6 belongs to the STM8S family, which is designed for general-purpose industrial and consumer applications, bridging the gap between simple 8-bit controllers and more complex 32-bit processors.
Key features of the STM8S903K3T6 include a 10-bit analog-to-digital converter (ADC) with up to 7 multiplexed channels, two 16-bit timers, a UART for serial communication, an SPI interface, and an I2C interface. The device also integrates a true data EEPROM with read-while-write capability, enabling non-volatile data storage without external components. The supply voltage range of 2.95V to 5.5V allows operation from standard 3.3V and 5V power rails, making it versatile for mixed-voltage systems.
The STM8S903K3T6 is built on ST's advanced 8-bit core architecture, which delivers up to 16 MIPS at 16 MHz, providing efficient execution of control algorithms. The integrated EEPROM and robust clock management, including an internal RC oscillator and optional external crystal, simplify system design by reducing external component count. The device also features low-power modes, including Active-Halt and Halt modes, to minimize energy consumption in battery-powered applications.
Typical applications include industrial control systems, home automation, consumer electronics, and automotive body electronics. The combination of analog and digital peripherals, along with the wide operating voltage range, makes it suitable for sensor interfacing, motor control, and communication bridging tasks. The 32-pin LQFP package provides a good balance between I/O count and board space, supporting compact PCB layouts.
When designing with the STM8S903K3T6, ensure proper decoupling of the VDD and VDDA pins with 100nF capacitors placed close to the device. The internal RC oscillator is accurate to ±1% over temperature, but for applications requiring precise timing, an external crystal can be connected to the OSC_IN and OSC_OUT pins. The device's EEPROM endurance is rated for 100,000 write/erase cycles, making it suitable for frequent data logging applications.
ドロップイン代替品: STM8S903K3T6 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
STM8S903K3T6C
✅ ドロップイン📋 参考代替品（カタログ未掲載）
STM8S903K3T6CTR
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STM8S903K3T6 最大定格＆電気的特性
| Core | STM8 8-bit |
| Clock Speed | 16 MHz |
| Flash Memory | 8 KB (8K x 8) |
| RAM Size | 1 KB |
| EEPROM Size | 640 bytes |
| 電源電圧 | 2.95 V to 5.5 V |
| I/O Ports | 16 |
| ADC Resolution | 10-bit |
| ADC Channels | 7 |
| Timers | 2 x 16-bit |
| UART | 1 |
| SPI | 1 |
| I2C | 1 |
| パッケージ | LQFP-32 |
| 実装タイプ | Surface Mount |
| 動作温度 | -40C to +85C |
| RoHS ステータス | Compliant |
STM8S903K3T6 ピン構成
| ピン 1 | VDD — Digital power supply |
| ピン 2 | PA1 — General purpose I/O / ADC input |
| ピン 3 | PA2 — General purpose I/O / ADC input |
| ピン 4 | PA3 — General purpose I/O / ADC input |
| ピン 5 | VSS — Digital ground |
| ピン 6 | PA4 — General purpose I/O / ADC input |
| ピン 7 | PA5 — General purpose I/O / ADC input |
| ピン 8 | PA6 — General purpose I/O / ADC input |
| ピン 9 | PB0 — General purpose I/O / SPI MOSI |
| ピン 10 | PB1 — General purpose I/O / SPI MISO |
| ピン 11 | PB2 — General purpose I/O / SPI SCK |
| ピン 12 | PB3 — General purpose I/O / I2C SCL |
| ピン 13 | PB4 — General purpose I/O / I2C SDA |
| ピン 14 | PB5 — General purpose I/O / UART TX |
| ピン 15 | PB6 — General purpose I/O / UART RX |
| ピン 16 | VDDIO — I/O power supply |
| ピン 17 | PC0 — General purpose I/O / ADC input |
| ピン 18 | PC1 — General purpose I/O / ADC input |
| ピン 19 | PC2 — General purpose I/O / ADC input |
| ピン 20 | PC3 — General purpose I/O / ADC input |
| ピン 21 | PC4 — General purpose I/O / ADC input |
| ピン 22 | PC5 — General purpose I/O / ADC input |
| ピン 23 | PC6 — General purpose I/O / ADC input |
| ピン 24 | PC7 — General purpose I/O / ADC input |
| ピン 25 | VDDA — Analog power supply |
| ピン 26 | VSSA — Analog ground |
| ピン 27 | PD0 — General purpose I/O / OSC_IN |
| ピン 28 | PD1 — General purpose I/O / OSC_OUT |
| ピン 29 | PD2 — General purpose I/O / timer input |
| ピン 30 | PD3 — General purpose I/O / timer output |
| ピン 31 | PD4 — General purpose I/O / timer output |
| ピン 32 | PD5 — General purpose I/O / timer output |
主な用途
STM8S903K3T6 の用途: 6 件s: Industrial Control Systems, Home Automation, Consumer Electronics, Automotive Body Electronics, Sensor Interfacing and Data Logging, Motor Control.
Industrial Control Systems
The STM8S903K3T6 is well-suited for industrial control systems due to its robust 8-bit core, wide operating voltage range, and integrated peripherals. The 10-bit ADC allows direct interfacing with analog sensors such as temperature probes and pressure transducers, while the UART, SPI, and I2C interfaces enable communication with external devices like motor drivers and human-machine interfaces (HMIs). The device's 16 MHz clock speed provides sufficient processing power for real-time control loops, and the 8KB Flash memory can accommodate moderate-sized firmware. The -40C to +85C operating temperature range ensures reliable operation in factory environments. In a typical application, the MCU reads sensor data, processes it using control algorithms, and outputs control signals to actuators via the GPIO pins. The integrated EEPROM allows storing calibration parameters and system settings without external memory. The low-power modes help reduce energy consumption in systems that operate intermittently.
おすすめ
Home Automation
In home automation, the STM8S903K3T6 serves as a cost-effective controller for smart lighting, thermostats, and security systems. Its 2.95V to 5.5V supply range allows direct operation from standard 3.3V or 5V power supplies, simplifying power design. The I2C interface enables connection to environmental sensors like the BME280 for temperature, humidity, and pressure monitoring. The UART interface can be used to communicate with Wi-Fi or Zigbee modules for remote control and monitoring. The 10-bit ADC can read analog light sensors to implement automatic lighting control. The device's low-power Halt mode reduces standby current to microamps, extending battery life in wireless sensor nodes. The 8KB Flash memory is sufficient for implementing communication protocols and control logic. The integrated EEPROM allows storing user preferences and device configurations. The compact LQFP-32 package fits well on small PCB designs for in-wall or in-ceiling mounting.
おすすめ
Consumer Electronics
The STM8S903K3T6 is ideal for consumer electronics such as remote controls, small appliances, and toys. Its low cost and integrated peripherals reduce overall system cost. The 16 MHz clock speed provides responsive user interface handling, while the 10-bit ADC can read analog inputs like potentiometers for volume control. The SPI interface can drive small OLED or LCD displays for status indication. The UART interface enables communication with other devices or debugging. The device's wide supply voltage range allows operation from two AA batteries (3V) or a USB 5V supply. The low-power modes are crucial for battery-powered devices, extending operational life. The 8KB Flash memory is sufficient for implementing user interface logic and simple state machines. The integrated EEPROM can store user settings such as volume levels or last-used modes. The compact package and minimal external component requirements make it suitable for space-constrained designs.
おすすめ
Automotive Body Electronics
The STM8S903K3T6 is designed for automotive body electronics applications such as window lift control, mirror adjustment, and lighting control. Its wide supply voltage range (2.95V to 5.5V) accommodates the fluctuating battery voltage in automotive environments. The 10-bit ADC can read analog sensors like position sensors for mirror adjustment. The two 16-bit timers can generate PWM signals for motor speed control or LED dimming. The UART interface enables communication with other ECUs in the vehicle network. The device's robust design includes protection against electrical transients, making it suitable for the harsh automotive environment. The -40C to +85C operating temperature range covers the typical automotive temperature requirements. The 8KB Flash memory is sufficient for implementing control algorithms and diagnostic routines. The integrated EEPROM can store calibration data and fault codes. The LQFP-32 package is suitable for PCB designs in door modules and body control modules.
おすすめ
Sensor Interfacing and Data Logging
The STM8S903K3T6 excels in sensor interfacing and data logging applications due to its integrated 10-bit ADC, EEPROM, and low-power modes. The ADC can sample multiple analog sensors, while the EEPROM provides non-volatile storage for logged data. The UART or SPI interface can be used to transfer logged data to a host computer or external memory. The device's low-power modes allow battery-powered data loggers to operate for extended periods. The 16 MHz clock speed enables fast sampling rates for dynamic signals. The wide supply voltage range allows operation from various battery chemistries. The 8KB Flash memory can store the logging firmware and configuration parameters. The integrated EEPROM with 100,000 write/erase cycles is suitable for frequent data logging. The compact package and minimal external components make it ideal for portable data loggers. The -40C to +85C temperature range allows operation in outdoor environments.
おすすめ
Motor Control
The STM8S903K3T6 is suitable for simple motor control applications such as DC motor speed control and stepper motor positioning. The two 16-bit timers can generate PWM signals with adjustable duty cycle and frequency, enabling precise motor speed control. The 10-bit ADC can read current sense resistors for closed-loop control. The UART interface allows communication with a host controller for command input and status reporting. The device's 16 MHz clock speed provides sufficient processing power for implementing PID control algorithms. The wide supply voltage range allows direct interfacing with motor driver ICs. The 8KB Flash memory can store the control firmware and calibration data. The integrated EEPROM can store motor parameters and tuning coefficients. The LQFP-32 package provides enough I/O pins for connecting to motor drivers, encoders, and limit switches. The device's robust design ensures reliable operation in industrial environments.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: STM8S903K3T6 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | STM8S903K3T6C | STM8S003K3T6C | STM8S103K3T6C | MC9S08PA8VLC |
|---|---|---|---|---|---|
| Package | LQFP-32 | LQFP-32 - same | TSSOP-20 - different | TSSOP-20 - different | LQFP-32 - different pinout |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| RAM Size | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 12-bit |
| Supply Voltage | 2.95V to 5.5V | 2.95V to 5.5V | 2.95V to 5.5V | 2.95V to 5.5V | 2.7V to 5.5V |
主な差別化要因
- True data EEPROM with read-while-write （vs STM8S003K3T6C)
- 32-pin LQFP package with more I/O （vs STM8S103K3T6C)
- Wide supply voltage range （vs MC9S08PA8VLC)
設計ノート
The STM8S903K3T6 requires a stable power supply. Place a 100nF ceramic capacitor as close as possible to each VDD and VDDA pin, and a 1uF to 10uF bulk capacitor on the main power rail. The VDDA pin should be connected to the same supply as VDD through a ferrite bead or low-value resistor to filter high-frequency noise, ensuring accurate ADC readings. The VSSA pin should be connected to the ground plane with minimal impedance.
For the LQFP-32 package, ensure proper solder pad design per IPC-7351 standards. The exposed pad (if present) should be connected to ground with multiple vias for thermal relief. Keep high-speed signals (SPI, UART) away from the crystal oscillator pins (PD0, PD1) to avoid interference. Route the ADC input traces away from digital traces to minimize noise coupling.
When using the internal RC oscillator, note that its accuracy is ±1% over temperature, which may not be sufficient for time-critical applications like UART communication at high baud rates. For such applications, use an external crystal (e.g., 16 MHz) connected to OSC_IN and OSC_OUT with appropriate load capacitors. Also, ensure the reset pin (NRST) is properly pulled up with a 100nF capacitor to ground to prevent spurious resets.
コンプライアンス情報
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified for automotive applications.
