# STM32F031F6P6

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · TSSOP-20

STM32F031F6P6 from STMicroelectronics, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model, then checked against ST open pin data); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BOOT0 | input | Boot memory selection input pin; selects boot address (user flash or bootloader) on device reset. |
| 2 | PF0-OSC_IN | input | High-speed external oscillator input for 4-32 MHz crystal with 5V-tolerant I/O capability. |
| 3 | PF1-OSC_OUT | output | High-speed external oscillator output for 4-32 MHz crystal with 5V-tolerant I/O capability. |
| 4 | NRST | bidirectional | Asynchronous reset input / reset output (active low) with internal weak pull-up resistor. |
| 5 | VDDA | power_in | Analog power supply for ADC and internal voltage regulator; 2.4-3.6 V with 100 nF decoupling capacitor required. |
| 6 | PA0 | bidirectional | General-purpose I/O port A bit 0, 3.3V-tolerant connected to ADC; supports TIM2_CH1_ETR, USART1_CTS alternate functions and ADC channel 0. |
| 7 | PA1 | bidirectional | General-purpose I/O port A bit 1, 3.3V-tolerant connected to ADC; supports TIM2_CH2, USART1_RTS alternate functions and ADC channel 1. |
| 8 | PA2 | bidirectional | General-purpose I/O port A bit 2, 3.3V-tolerant connected to ADC; supports TIM2_CH3, USART1_TX alternate functions and ADC channel 2. |
| 9 | PA3 | bidirectional | General-purpose I/O port A bit 3, 3.3V-tolerant connected to ADC; supports TIM2_CH4, USART1_RX alternate functions and ADC channel 3. |
| 10 | PA4 | bidirectional | General-purpose I/O port A bit 4, 3.3V-tolerant connected to ADC; supports SPI1_NSS, I2S1_WS, TIM14_CH1, USART1_CK alternate functions and ADC channel 4. |
| 11 | PA5 | bidirectional | General-purpose I/O port A bit 5, 3.3V-tolerant connected to ADC; supports SPI1_SCK, I2S1_CK, TIM2_CH1_ETR alternate functions and ADC channel 5. |
| 12 | PA6 | bidirectional | General-purpose I/O port A bit 6, 3.3V-tolerant connected to ADC; supports SPI1_MISO, I2S1_MCK, TIM3_CH1, TIM1_BKIN, TIM16_CH1 alternate functions and ADC channel 6. |
| 13 | PA7 | bidirectional | General-purpose I/O port A bit 7, 3.3V-tolerant connected to ADC; supports SPI1_MOSI, I2S1_SD, TIM3_CH2, TIM1_CH1N, TIM17_CH1 alternate functions and ADC channel 7. |
| 14 | PB1 | bidirectional | General-purpose I/O port B bit 1, 3.3V-tolerant connected to ADC; supports TIM3_CH4, TIM14_CH1, TIM1_CH3N alternate functions and ADC channel 9. |
| 15 | VSS | power_in | Digital ground; analog ground (VSSA) is internally connected to this VSS pin. |
| 16 | VDD | power_in | Digital power supply, 2.0-3.6 V; requires 100 nF ceramic capacitor and 4.7 µF electrolytic capacitor close to pins. |
| 17 | PA9 | bidirectional | General-purpose I/O port A bit 9, 5V-tolerant I/O capable (FTf); supports USART1_TX, TIM1_CH2, I2C1_SCL with Fast Mode Plus (1 Mbit/s) capability. |
| 18 | PA10 | bidirectional | General-purpose I/O port A bit 10, 5V-tolerant I/O capable (FTf); supports USART1_RX, TIM1_CH3, I2C1_SDA with Fast Mode Plus and Stop mode wakeup. |
| 19 | PA13 | bidirectional | Port A bit 13, 5V-tolerant I/O; configured as Serial Wire Debug I/O (SWDIO) after reset with internal pull-up enabled. |
| 20 | PA14 | bidirectional | Port A bit 14, 5V-tolerant I/O; configured as Serial Wire Debug Clock (SWCLK) after reset with internal pull-down enabled. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TSSOP-20 |
| Category | Embedded Processors & Controllers |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `STM32F031F6P6`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `stm32f031f6p6-etched.step` / `stm32f031f6p6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32f031f6p6.step` / `stm32f031f6p6.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/8588884751604461568) (106 pp, sha256 `36b17e3dce795273`, 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/stm32f031f6p6-datasheet.pdf)