STM8S105K4T6 - 8-bit MCU, 16KB Flash, 16MHz | STMicroelectronics
MPN： STM8S105K4T6 ✓ 啟用中STM8S105K4T6 概覽
An 8-bit microcontroller (MCU) is a single-chip computer containing a processor core, memory, and programmable input/output peripherals. The STM8S105K4T6 belongs to the STM8S family, which is designed for cost-sensitive industrial and consumer applications. As a medium-density device per reference manual RM0016, it balances performance and peripheral integration, providing a 10-bit ADC, multiple timers, and standard communication interfaces like UART, SPI, and I2C.
Key features include a 16 MHz CPU clock delivering up to 16 MIPS, 16 KB Flash with read-while-write capability, 1 KB EEPROM with up to 300k write/erase cycles, and a 10-bit ADC with up to 7 channels. The device integrates a 16-bit advanced control timer, two 16-bit general-purpose timers, and a basic timer, plus UART, SPI, and I2C interfaces for connectivity with sensors, displays, and other peripherals.
The STM8S105K4T6 uses a Harvard-architecture STM8 core with a 3-stage pipeline. An embedded SWIM debug module enables in-circuit debugging and programming, reducing development time. The clock system offers internal and external oscillator options, including a low-power crystal oscillator and a PLL for clock multiplication.
Typical applications include industrial control, home appliances, sensor interfaces, and motor control. Its wide operating voltage range and industrial temperature grade (-40C to +85C) make it suitable for harsh environments. The integrated EEPROM eliminates external storage in many designs, reducing BOM cost.
When designing with this MCU, ensure proper decoupling of power supply pins and consider the thermal characteristics of the LQFP-32 package. Reserve the SWIM interface for programming and debugging. For low-power designs, use Active-halt and Halt modes to minimize current consumption.
直接替換替代品，適用於 STM8S105K4T6 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： STM8S105K4T6 （相同外形與佔位） — 差異在於 Communication Interfaces, Data EEPROM, Operating Temperature, Timers.
STM8S105K6T6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM8S105K4T6C
✅ 直接替換📋 參考替代品（不在目錄中）
STM8S103K3T6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM8S207K8T6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA328P-AU
⚡ 相同封裝 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →STM8S105K4T6 最大額定值與電氣特性
| Core Processor | STM8 8-bit CISC |
| Core Size | 8-bit |
| 最大時脈頻率 | 16 MHz |
| Program Memory Size | 16 KB (16K x 8) Flash |
| Data EEPROM | 1 KB (true data EEPROM, 300k cycles) |
| Supply Voltage Range | 2.95 V to 5.5 V |
| ADC Resolution | 10-bit, up to 7 channels |
| Timers | 1x 16-bit advanced, 2x 16-bit general purpose, 1x basic |
| Communication Interfaces | UART, SPI, I2C |
| Debug Interface | SWIM (Single Wire Interface Module) |
| 工作溫度 | -40C to +85C |
| 封裝 | LQFP-32 (7x7 mm) |
| 安裝類型 | Surface Mount |
| Performance | Up to 16 MIPS at 16 MHz |
| Low Power Modes | Active-halt, Halt |
| RoHS 狀態 | Compliant |
STM8S105K4T6 腳位配置
| 腳位 1 | NRST — Active-low bidirectional reset |
| 腳位 2 | PA1/OSCIN — Port A1 / crystal oscillator input |
| 腳位 3 | PA2/OSCOUT — Port A2 / crystal oscillator output |
| 腳位 4 | VSSA — Analog ground |
| 腳位 5 | VDDA — Analog power supply for ADC |
| 腳位 6 | VSS — Digital ground |
| 腳位 7 | VCAP — 1.8V core regulator capacitor |
| 腳位 8 | VDD — Digital power supply (2.95V-5.5V) |
| 腳位 9 | PF4 — General purpose I/O |
| 腳位 10 | PC3/TIM2_CH3 — Port C3 / Timer 2 channel 3 |
| 腳位 11 | PC4/TIM1_CH4/ADC — Port C4 / Timer 1 channel 4 / ADC input |
| 腳位 12 | PC5/SPI_SCK — Port C5 / SPI clock |
| 腳位 13 | PC6/SPI_MOSI — Port C6 / SPI master out |
| 腳位 14 | PC7/SPI_MISO — Port C7 / SPI master in |
| 腳位 18 | PD1/SWIM — Port D1 / SWIM debug and programming interface |
| 腳位 19 | PD2/ADC_ETR — Port D2 / ADC external trigger |
| 腳位 30 | PA3/TIM2_CH1 — Port A3 / Timer 2 channel 1 |
| 腳位 32 | PF0 — General purpose I/O |
典型應用
STM8S105K4T6 適用於 6 應用s: Industrial Control, Home Appliances, Sensor Interfaces, Motor Control (Small Fans and Pumps), Consumer Electronics and Lighting, Building Automation Nodes.
Industrial Control
The STM8S105K4T6 fits industrial control nodes thanks to its 16 MHz core, industrial -40C to +85C rating, and 2.95V to 5.5V supply tolerance for noisy 5V PLC backplanes. Its 16-bit advanced control timer handles PWM actuator drive, while the 10-bit ADC (7 channels) digitizes potentiometer and sensor feedback. UART connectivity links to HMI panels; SWIM allows field reprogramming. Use the Active-halt mode in standby panels to cut idle current.
推薦
Home Appliances
In washing machines, cookers, and fans, the STM8S105K4T6 provides low-BOM-cost control: integrated EEPROM (1 KB, 300k cycles) stores user settings without external memory, and the advanced 16-bit timer generates phase-correct PWM for motor or heater control. The 5V-capable GPIO drives relays and TRIAC drivers directly through transistor buffers. Its robust clock system tolerates appliance EMI, and the 32-pin LQFP keeps the control PCB compact.
推薦
Sensor Interfaces
The 10-bit ADC with up to 7 channels makes the STM8S105K4T6 a cost-effective sensor hub for analog transducers such as NTC thermistors, pressure bridges, and potentiometers. The I2C and SPI ports connect digital sensors (e.g., ADS1115 for higher-resolution expansion), while the internal RC oscillator removes BOM cost of external crystals in tolerant applications. At 5V operation, ADC full-scale matches industrial sensor outputs without scaling circuitry.
推薦
Motor Control (Small Fans and Pumps)
Small BLDC fans, pumps, and brushed motor drives benefit from the STM8S105K4T6's 16-bit advanced control timer with complementary PWM outputs and the 10-bit ADC for current and BEMF sensing. Running at 16 MIPS, the core executes basic six-step commutation or closed-loop speed control. The 2.95V-5.5V range aligns with gate-driver supply rails, and fault inputs use GPIO interrupts for fast over-current shutdown.
推薦
Consumer Electronics and Lighting
For LED dimmers, chargers, and small appliance user interfaces, the STM8S105K4T6 combines low unit cost with UART/I2C connectivity and capacitive-touch-friendly GPIO scanning. The integrated EEPROM keeps calibration and user preferences across power cycles, and Halt mode supports <uA-class standby targets when paired with wake-on-interrupt buttons. The LQFP-32 footprint suits compact, single-sided cost-optimized consumer PCBs.
推薦
Building Automation Nodes
Wall-mounted thermostats, damper controllers, and occupancy sensors use the STM8S105K4T6 for low-cost node intelligence: UART or I2C links to displays and sensors, ADC channels read potentiometer setpoints and NTC temperature, and the advanced timer drives valve or damper actuators via PWM. The industrial temperature grade and 5V operation fit HVAC wiring conditions, while SWIM enables firmware updates during commissioning without removing the PCB.
推薦
推薦產品摘要
工程參考資料，適用於 STM8S105K4T6 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | STM8S105K6T6 | STM8S105K4T6C | STM8S103K3T6 | ATMEGA328P-AU |
|---|---|---|---|---|---|
| Package | LQFP-32 | LQFP-32 - same | LQFP-32 - same | LQFP-32 - same | TQFP-32 - same footprint, different pinout |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | Microchip Technology |
| Program Flash | 16 KB | 32 KB | 16 KB | 8 KB | 32 KB |
| Data EEPROM | 1 KB | 1 KB | 1 KB | 640 B | 1 KB |
| Max CPU Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| Supply Voltage | 2.95 V - 5.5 V | 2.95 V - 5.5 V | 2.95 V - 5.5 V | 2.95 V - 5.5 V | 1.8 V - 5.5 V |
| ADC | 10-bit, 7 ch | 10-bit, 7 ch | 10-bit, 7 ch | 10-bit, 5 ch | 10-bit, 8 ch |
| Drop-in Compatibility | Reference | Yes - pin-to-pin | Yes - identical | Yes with code change | No - PCB rework required |
| Communication Interfaces | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C (TWI) |
主要差異化特點
- Best cost-to-memory ratio for basic control (對比STM8S105K6T6)
- True data EEPROM eliminates external NVM (對比STM8S103K3T6)
- Same-footprint upgrade path to 32-bit-class features (對比ATMEGA328P-AU)
設計說明
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of pin 8, plus a 4.7-10 uF bulk capacitor per board. VCAP requires a 1 uF ceramic capacitor to ground - it stabilizes the internal 1.8V core regulator and must never be omitted or loaded externally. Connect VDDA/VSSA to a clean analog supply, preferably filtered through an RC (10 ohm/1 uF), to preserve 10-bit ADC accuracy.
Reserve the SWIM pin (PD1) with a 2x4 or 1x4 programming header on every production PCB - ST's ST-LINK/V2 programs and debugs in-circuit via SWIM. Route NRST to the header as well for reliable reset control during flashing. Keep analog ADC traces short and away from PWM/timer switching nets to minimize crosstalk into the 10-bit converter.
Do not exceed 5.5V on VDD or apply 5V-tolerant assumptions to NRST. GPIO sink/source limits per ST datasheet must be respected when driving relays - always use transistor or ULN2803 buffers. EEPROM endurance is 300k cycles; avoid logging data at high frequency in main loops, or wear will accumulate quickly. In Halt mode, ensure wake sources (EXTI or reset) are configured before entering the mode, or the device will appear bricked.
合規資訊
RoHS compliant per STMicroelectronics product page. Industrial grade (-40C to +85C), not automotive qualified.
