# STM32L031F6P7

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

STM32L031F6P7 from STMicroelectronics, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BOOT0 | input | Bootstrap pin to select boot mode (Flash memory, System memory, or embedded RAM) during device startup |
| 2 | PC14-OSC32_IN | bidirectional | 32.768 kHz oscillator input pin for low-speed external crystal or general-purpose I/O pin configured as standard CMOS level |
| 3 | PC15-OSC32_OUT | bidirectional | 32.768 kHz oscillator output pin for low-speed external crystal or general-purpose I/O pin configured as standard CMOS level |
| 4 | NRST | bidirectional | External reset input pin with embedded weak pull-up resistor (25 to 65 kΩ) for device reset control |
| 5 | VDDA | power_in | Analog power supply voltage (1.65 to 3.6 V) for ADC, reset blocks, RCs and PLL |
| 6 | PA0-CK_IN | bidirectional | General-purpose I/O port A pin 0, LPTIM input, timer channels, USART/LPUART signals, comparator output, or high-speed external clock input |
| 7 | PA1 | bidirectional | General-purpose I/O port A pin 1 (5V tolerant), supports LPTIM, timer channels, I2C, USART, and event output functions |
| 8 | PA2 | bidirectional | General-purpose I/O port A pin 2 (standard 3.3V I/O), supports timer channels, USART, LPUART, and comparator output functions |
| 9 | PA3 | bidirectional | General-purpose I/O port A pin 3 (5V tolerant), supports timer channels, USART, and LPUART functions |
| 10 | PA4 | bidirectional | General-purpose I/O port A pin 4 (standard 3.3V I/O), supports SPI, LPTIM, USART, timer, and comparator input functions |
| 11 | PA5 | bidirectional | General-purpose I/O port A pin 5 (standard 3.3V I/O), supports SPI, LPTIM, and timer functions |
| 12 | PA6 | bidirectional | General-purpose I/O port A pin 6 (5V tolerant), supports SPI, LPTIM, timer, event output, and comparator output functions |
| 13 | PA7 | bidirectional | General-purpose I/O port A pin 7 (5V tolerant), supports SPI, LPTIM, timer, event output, and comparator output functions |
| 14 | PB1 | bidirectional | General-purpose I/O port B pin 1 (5V tolerant), supports USART clock, SPI, and LPUART functions |
| 15 | VSS | power_out | Ground supply connection (0 V reference) for device |
| 16 | VDD | power_in | Main power supply voltage (1.65 to 3.6 V) for I/Os and internal regulator |
| 17 | PA9 | bidirectional | General-purpose I/O port A pin 9 (5V tolerant with FM+ Fast Mode Plus capability), supports I2C, USART, and timer functions |
| 18 | PA10 | bidirectional | General-purpose I/O port A pin 10 (5V tolerant with FM+ Fast Mode Plus capability), supports I2C, USART, and timer functions |
| 19 | PA13 | bidirectional | General-purpose I/O port A pin 13 (5V tolerant), serial wire debug I/O (SWDIO), supports LPTIM and LPUART functions |
| 20 | PA14 | bidirectional | General-purpose I/O port A pin 14 (5V tolerant), serial wire debug clock (SWCLK), supports I2C, USART, LPTIM, and LPUART functions |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STM32L031F6P7`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `stm32l031f6p7-etched.step` / `stm32l031f6p7-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32l031f6p7.step` / `stm32l031f6p7.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/stm32l031f6p7.pdf) (126 pp, sha256 `9726c48418e03f62`, retrieved 2026-09-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/stm32l031f6p7-datasheet.pdf)