# STM8S208S6T3C

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · LQFP-44(10x10)

STM8S208S6T3C from STMicroelectronics, in a LQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | NRST | input | Reset input pin, active low with internal pull-up resistor for device reset control. |
| 2 | PA1/OSCIN | bidirectional | Port A1 general-purpose I/O or high-speed external oscillator crystal input with floating input and slow output. |
| 3 | PA2/OSCOUT | bidirectional | Port A2 general-purpose I/O or high-speed external oscillator crystal output with floating input and slow output. |
| 4 | VSSIO_1 | power_in | I/O power supply ground return connection. |
| 5 | VSS | power_in | Digital power supply ground return connection. |
| 6 | VCAP | passive | 1.8 V internal regulator external capacitor pin, requires 1 µF capacitor with ESR < 0.5 Ω and ESL < 0.1 nH connected to ground. |
| 7 | VDD | power_in | Digital power supply input, operating voltage range 2.95 to 5.5 V. |
| 8 | VDDIO_1 | power_in | I/O power supply input for I/O ports. |
| 9 | PA4/UART1_RX | bidirectional | Port A4 high-sink general-purpose I/O with floating input and programmable output (slow default) or UART1 receive input. |
| 10 | PA5/UART1_TX | bidirectional | Port A5 high-sink general-purpose I/O with floating input and programmable output (slow default) or UART1 transmit output. |
| 11 | PA6/UART1_CK | bidirectional | Port A6 high-sink general-purpose I/O with floating input and programmable output (slow default) or UART1 synchronous clock. |
| 12 | VDDA | power_in | Analog power supply input for analog circuits including ADC. |
| 13 | VSSA | power_in | Analog power supply ground return for analog circuits. |
| 14 | PB7/AIN7 | bidirectional | Port B7 general-purpose I/O with floating input and slow output or analog input channel 7 to ADC. |
| 15 | PB6/AIN6 | bidirectional | Port B6 general-purpose I/O with floating input and slow output or analog input channel 6 to ADC. |
| 16 | PB5/AIN5 | bidirectional | Port B5 general-purpose I/O with weak pull-up and slow output, analog input 5, or I2C_SDA alternate function. |
| 17 | PB4/AIN4 | bidirectional | Port B4 general-purpose I/O with weak pull-up and slow output, analog input 4, or I2C_SCL alternate function. |
| 18 | PB3/AIN3 | bidirectional | Port B3 general-purpose I/O with weak pull-up and slow output, analog input 3, or TIM1_ETR alternate function. |
| 19 | PB2/AIN2 | bidirectional | Port B2 general-purpose I/O with weak pull-up and slow output, analog input 2, or TIM1_CH3N alternate function. |
| 20 | PB1/AIN1 | bidirectional | Port B1 general-purpose I/O with weak pull-up and slow output, analog input 1, or TIM1_CH2N alternate function. |
| 21 | PB0/AIN0 | bidirectional | Port B0 general-purpose I/O with weak pull-up and slow output, analog input 0, or TIM1_CH1N alternate function. |
| 22 | PE6/AIN9 | bidirectional | Port E6 general-purpose I/O with weak pull-up and slow output or analog input channel 9 to ADC. |
| 23 | PE5/SPI_NSS | bidirectional | Port E5 general-purpose I/O with weak pull-up and slow output or SPI master/slave select input/output. |
| 24 | PC1/TIM1_CH1 | bidirectional | Port C1 high-sink general-purpose I/O with floating input and programmable output (slow default) or timer 1 channel 1 output. |
| 25 | PC2/TIM1_CH2 | bidirectional | Port C2 high-sink general-purpose I/O with floating input and programmable output (slow default) or timer 1 channel 2 output. |
| 26 | PC3/TIM1_CH3 | bidirectional | Port C3 high-sink general-purpose I/O with floating input and programmable output (slow default) or timer 1 channel 3 output. |
| 27 | PC5/SPI_SCK | bidirectional | Port C5 high-sink general-purpose I/O with floating input and programmable output (slow default) or SPI serial clock. |
| 28 | VSSIO_2 | power_in | I/O power supply ground return connection. |
| 29 | VDDIO_2 | power_in | I/O power supply input for I/O ports. |
| 30 | PC6/SPI_MOSI | bidirectional | Port C6 high-sink general-purpose I/O with floating input and programmable output (slow default) or SPI master out/slave in. |
| 31 | PC7/SPI_MISO | bidirectional | Port C7 high-sink general-purpose I/O with floating input and programmable output (slow default) or SPI master in/slave out. |
| 32 | PG0/CAN_TX | bidirectional | Port G0 general-purpose I/O with floating input and slow output or beCAN transmit output (STM8S208xx only). |
| 33 | PG1/CAN_RX | bidirectional | Port G1 general-purpose I/O with floating input and slow output or beCAN receive input (STM8S208xx only). |
| 34 | PE2/I2C_SDA | bidirectional | Port E2 true open-drain general-purpose I/O with slow output and no internal pull-up or I2C data line. |
| 35 | PE1/I2C_SCL | bidirectional | Port E1 true open-drain general-purpose I/O with slow output and no internal pull-up or I2C clock line. |
| 36 | PE0/CLK_CCO | bidirectional | Port E0 high-sink general-purpose I/O with floating input and programmable output (slow default) or configurable clock output. |
| 37 | PD0/TIM3_CH2 | bidirectional | Port D0 high-sink general-purpose I/O with floating input and programmable output (slow default) or timer 3 channel 2 output. |
| 38 | PD1/SWIM | bidirectional | Port D1 high-sink general-purpose I/O with floating input and programmable output (fast default) or SWIM debug interface. |
| 39 | PD2/TIM3_CH1 | bidirectional | Port D2 high-sink general-purpose I/O with floating input and programmable output (slow default) or timer 3 channel 1 output. |
| 40 | PD3/TIM2_CH2 | bidirectional | Port D3 high-sink general-purpose I/O with floating input and programmable output (slow default) or timer 2 channel 2 output. |
| 41 | PD4/TIM2_CH1 | bidirectional | Port D4 high-sink general-purpose I/O with floating input and programmable output (slow default), timer 2 channel 1 output, or beeper output. |
| 42 | PD5/UART3_TX | bidirectional | Port D5 general-purpose I/O with floating input and slow output or UART3 transmit output. |
| 43 | PD6/UART3_RX | bidirectional | Port D6 general-purpose I/O with floating input and slow output or UART3 receive input. |
| 44 | PD7/TLI | bidirectional | Port D7 general-purpose I/O with floating input and slow output, top level interrupt input, or timer 1 channel 4 output. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | LQFP-44(10x10) |
| Category | Embedded Processors & Controllers |
| Pins | 44 |

## CAD (KiCad official)

- Symbol: `STM8S208S6T3C`
- Footprint: `Package_QFP:LQFP-44_10x10mm_P0.8mm`
- 3D model: LQFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files: `stm8s208s6t3c-etched.step` / `stm8s208s6t3c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm8s208s6t3c.step` / `stm8s208s6t3c.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588922585929428992) (117 pp, sha256 `7adeaa849cf9e22f`, retrieved 2026-10-01, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/stm8s208s6t3c-datasheet.pdf)