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stm32l031k6t6

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by Ray

STMicroelectronics Microcontrollers (MCU/MPU/SOC), LQFP-32(7x7). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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STM32L031K6T6

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · LQFP-32(7x7)

STM32L031K6T6 from STMicroelectronics, in a LQFP-32(7x7). 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 VDD power_in Digital core power supply, 1.65 V to 3.6 V. Must be decoupled with a 100 nF ceramic near the pin, and one bulk 4.7 uF for the package.
2 PC14-OSC32_IN bidirectional GPIO PC14 muxed with LSE (32.768 kHz) crystal oscillator input OSC32_IN. Configured as OSC32_IN by RCC when LSE is enabled; otherwise usable as PC14 (standard 3.3 V I/O, TC).
3 PC15-OSC32_OUT bidirectional GPIO PC15 muxed with LSE (32.768 kHz) crystal oscillator output OSC32_OUT. Configured as OSC32_OUT by RCC when LSE is enabled; otherwise usable as PC15 (TC I/O).
4 NRST bidirectional Bidirectional device reset input/output with embedded weak pull-up (RPU ~ 30-50 kOhm). Drive low to reset the MCU; the MCU drives it low internally when a reset source triggers. Recommended external ~100 nF cap to VSS.
5 VDDA power_in Analog power supply for ADC, comparators, reset block, PLL, and internal reference (1.65 V to 3.6 V). Must be tied to VDD and decoupled with 100 nF and 1 uF ceramics close to the pin.
6 PA0-CK_IN bidirectional General-purpose I/O PA0, TC (3.3 V) structure. Muxed with LSE bypass clock input (CK_IN). Alternate functions: LPTIM1_IN1, TIM2_CH1, USART2_CTS, TIM2_ETR, COMP1_OUT. Additional: COMP1_INM6, ADC_IN0, RTC_TAMP2/WKUP1.
7 PA1 bidirectional General-purpose I/O PA1, FT (5 V tolerant). Alternate functions: EVENTOUT, LPTIM1_IN2, TIM2_CH2, I2C1_SMBA, USART2_RTS, TIM21_ETR. Additional: COMP1_INP, ADC_IN1.
8 PA2 bidirectional General-purpose I/O PA2, TC (3.3 V) structure. Alternate functions: TIM21_CH1, TIM2_CH3, USART2_TX, LPUART1_TX, COMP2_OUT. Additional: COMP2_INM6, ADC_IN2, RTC_TAMP3/RTC_TS/RTC_OUT/WKUP3.
9 PA3 bidirectional General-purpose I/O PA3, FT (5 V tolerant). Alternate functions: TIM21_CH2, TIM2_CH4, USART2_RX, LPUART1_RX. Additional: COMP2_INP, ADC_IN3.
10 PA4 bidirectional General-purpose I/O PA4, TC (3.3 V). Alternate functions: SPI1_NSS, LPTIM1_IN1, USART2_CK, TIM22_ETR. Additional: COMP1_INM4, COMP2_INM4, ADC_IN4.
11 PA5 bidirectional General-purpose I/O PA5, TC (3.3 V). Alternate functions: SPI1_SCK, LPTIM1_IN2, TIM2_ETR, TIM2_CH1. Additional: COMP1_INM5, COMP2_INM5, ADC_IN5.
12 PA6 bidirectional General-purpose I/O PA6, FT (5 V tolerant). Alternate functions: SPI1_MISO, LPTIM1_ETR, LPUART1_CTS, TIM22_CH1, EVENTOUT, COMP1_OUT. Additional: ADC_IN6.
13 PA7 bidirectional General-purpose I/O PA7, FT (5 V tolerant). Alternate functions: SPI1_MOSI, LPTIM1_OUT, USART2_CTS, TIM22_CH2, EVENTOUT, COMP2_OUT. Additional: ADC_IN7.
14 PB0 bidirectional General-purpose I/O PB0, FT (5 V tolerant). Alternate functions: EVENTOUT, SPI1_MISO, USART2_RTS, TIM2_CH3. Additional: ADC_IN8, VREF_OUT.
15 PB1 bidirectional General-purpose I/O PB1, FT (5 V tolerant). Alternate functions: USART2_CK, SPI1_MOSI, LPUART1_RTS, TIM2_CH4. Additional: ADC_IN9, VREF_OUT.
16 VSS power_in Digital ground reference. Tie to the analog ground plane; VSSA is internally bonded to VSS in the LQFP32 package.
17 VDD power_in Digital core power supply, 1.65 V to 3.6 V. Second VDD pin; decouple with 100 nF near the pin.
18 PA8 bidirectional General-purpose I/O PA8, FT (5 V tolerant). Alternate functions: MCO, LPTIM1_IN1, EVENTOUT, USART2_CK, TIM2_CH1.
19 PA9 bidirectional General-purpose I/O PA9, FTf (5 V tolerant, Fast Mode Plus capable). Alternate functions: MCO, I2C1_SCL, USART2_TX, TIM22_CH1.
20 PA10 bidirectional General-purpose I/O PA10, FTf (5 V tolerant, Fast Mode Plus capable). Alternate functions: I2C1_SDA, USART2_RX, TIM22_CH2.
21 PA11 bidirectional General-purpose I/O PA11, FT (5 V tolerant). Alternate functions: SPI1_MISO, EVENTOUT, USART2_CTS, TIM21_CH2, COMP1_OUT.
22 PA12 bidirectional General-purpose I/O PA12, FT (5 V tolerant). Alternate functions: SPI1_MOSI, EVENTOUT, USART2_RTS, COMP2_OUT.
23 PA13 bidirectional GPIO PA13, FT (5 V tolerant). Serial Wire Debug data I/O (SWDIO) after reset. Alternate functions: SWDIO (AF0, default), LPTIM1_ETR, LPUART1_RX.
24 PA14 bidirectional GPIO PA14, FT (5 V tolerant). Serial Wire Debug clock (SWCLK) after reset. Alternate functions: SWCLK (AF0, default), LPTIM1_OUT, I2C1_SMBA, USART2_TX, LPUART1_TX.
25 PA15 bidirectional General-purpose I/O PA15, FT (5 V tolerant). Alternate functions: SPI1_NSS, TIM2_ETR, EVENTOUT, USART2_RX, TIM2_CH1.
26 PB3 bidirectional General-purpose I/O PB3, FT (5 V tolerant). Alternate functions: SPI1_SCK, TIM2_CH2, EVENTOUT. Additional: COMP2_INN.
27 PB4 bidirectional General-purpose I/O PB4, FT (5 V tolerant). Alternate functions: SPI1_MISO, EVENTOUT, TIM22_CH1. Additional: COMP2_INP.
28 PB5 bidirectional General-purpose I/O PB5, FT (5 V tolerant). Alternate functions: SPI1_MOSI, LPTIM1_IN1, I2C1_SMBA, TIM22_CH2. Additional: COMP2_INP.
29 PB6 bidirectional General-purpose I/O PB6, FTf (5 V tolerant, Fast Mode Plus capable). Alternate functions: USART2_TX, I2C1_SCL, LPTIM1_ETR, TIM21_CH1. Additional: COMP2_INP.
30 PB7 bidirectional General-purpose I/O PB7, FTf (5 V tolerant, Fast Mode Plus capable). Alternate functions: USART2_RX, I2C1_SDA, LPTIM1_IN2. Additional: COMP2_INP, VREF_PVD_IN.
31 BOOT0 input Boot mode selection input (dedicated B-type pin). Sampled at reset: 0 = boot from user Flash, 1 = boot from system memory (embedded bootloader). Typically pulled to VSS with a resistor for normal operation.
32 VSS power_in Digital ground reference. Second VSS pin on the LQFP32; also serves as the analog ground return since no separate VSSA exists on this package.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package LQFP-32(7x7)
Category MCU
Pins 32

Ordering variants

  • STM32L031K6T6
  • STM32L031K6T6K6U6
  • STM32L031K6T6C6T6
  • STM32L031K6T6E6U6
  • STM32L031K6T6G6Y6
  • STM32L031K6T6F6P6

CAD (KiCad official)

  • Symbol: STM32L031K6T6
  • Footprint: Package_QFP:LQFP-32_7x7mm_P0.8mm
  • 3D model: LQFP-32(7x7) (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: STMicroelectronics datasheet (None pp, sha256 dfdbba3a554ab2da, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

Symbol & Footprint

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