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STM32L051R8T6

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STMicroelectronics Microcontrollers (MCU/MPU/SOC), LQFP-64(10x10). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.

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Symbol & Footprint

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Datasheet

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Contents

README

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STM32L051R8T6

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · LQFP-64(10x10)

STM32L051R8T6 from STMicroelectronics, in a LQFP-64(10x10). 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 VDD power_in Digital supply pin; the device operates from a 1.65 V to 3.6 V power supply per the features list.
2 PC13 bidirectional 5 V tolerant I/O (FT) with additional functions RTC_TAMP1, RTC_TS, RTC_OUT and WKUP2 and no alternate functions listed.
3 PC14-OSC32_IN bidirectional 5 V tolerant I/O (FT) whose function after reset is PC14; additional function OSC32_IN is the 32 kHz oscillator input for the RTC.
4 PC15-OSC32_OUT bidirectional Standard 3.3 V I/O (TC) whose function after reset is PC15; additional function OSC32_OUT is the 32 kHz oscillator output.
5 PH0-OSC_IN bidirectional Standard 3.3 V I/O (TC) whose function after reset is PH0; additional function OSC_IN is the crystal oscillator input (1 to 25 MHz crystal oscillator per the features list).
6 PH1-OSC_OUT bidirectional Standard 3.3 V I/O (TC) whose function after reset is PH1; additional function OSC_OUT is the crystal oscillator output (1 to 25 MHz crystal oscillator per the features list).
7 NRST bidirectional Bidirectional reset pin (RST type) with an embedded weak pull-up resistor.
8 PC0 bidirectional 5 V tolerant I/O (FT) with alternate functions LPTIM1_IN1 and EVENTOUT and additional analog input ADC_IN10.
9 PC1 bidirectional 5 V tolerant I/O (FT) with alternate functions LPTIM1_OUT and EVENTOUT and additional analog input ADC_IN11.
10 PC2 bidirectional 5 V tolerant I/O (FT) with alternate functions LPTIM1_IN2 and SPI2_MISO/I2S2_MCK and additional analog input ADC_IN12.
11 PC3 bidirectional 5 V tolerant I/O (FT) with alternate functions LPTIM1_ETR and SPI2_MOSI/I2S2_SD and additional analog input ADC_IN13.
12 VSSA power_in Analog ground pin; all voltages are referenced to VSS per section 6.1.
13 VDDA power_in Analog supply pin; the 12-bit ADC and the comparators are specified down to 1.65 V per the features list.
14 PA0 bidirectional Standard 3.3 V I/O (TC) with alternate functions TIM2_CH1, USART2_CTS, TIM2_ETR and COMP1_OUT and additional functions COMP1_INM6, ADC_IN0 and RTC_TAMP2/WKUP1.
15 PA1 bidirectional 5 V tolerant I/O (FT) with alternate functions EVENTOUT, TIM2_CH2, USART2_RTS_DE and TIM21_ETR and additional functions COMP1_INP and ADC_IN1.
16 PA2 bidirectional 5 V tolerant I/O (FT) with alternate functions TIM21_CH1, TIM2_CH3, USART2_TX and COMP2_OUT and additional functions COMP2_INM6 and ADC_IN2.
17 PA3 bidirectional 5 V tolerant I/O (FT) with alternate functions TIM21_CH2, TIM2_CH4 and USART2_RX and additional functions COMP2_INP and ADC_IN3.
18 VSS power_in Ground pin for the digital supply; all voltages are referenced to VSS per section 6.1.
19 VDD power_in Digital supply pin; the device operates from a 1.65 V to 3.6 V power supply per the features list.
20 PA4 bidirectional Standard 3.3 V I/O (TC) with alternate functions SPI1_NSS, USART2_CK and TIM22_ETR and additional functions COMP1_INM4, COMP2_INM4 and ADC_IN4.
21 PA5 bidirectional Standard 3.3 V I/O (TC) with alternate functions SPI1_SCK, TIM2_ETR and TIM2_CH1 and additional functions COMP1_INM5, COMP2_INM5 and ADC_IN5.
22 PA6 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_MISO, LPUART1_CTS, TIM22_CH1, EVENTOUT and COMP1_OUT and additional function ADC_IN6.
23 PA7 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_MOSI, TIM22_CH2, EVENTOUT and COMP2_OUT and additional function ADC_IN7.
24 PC4 bidirectional 5 V tolerant I/O (FT) with alternate functions EVENTOUT and LPUART1_TX and additional function ADC_IN14.
25 PC5 bidirectional 5 V tolerant I/O (FT) with alternate function LPUART1_RX and additional function ADC_IN15.
26 PB0 bidirectional 5 V tolerant I/O (FT) with alternate function EVENTOUT and additional functions ADC_IN8 and VREF_OUT.
27 PB1 bidirectional 5 V tolerant I/O (FT) with alternate function LPUART1_RTS_DE and additional functions ADC_IN9 and VREF_OUT.
28 PB2 bidirectional 5 V tolerant I/O (FT) with alternate function LPTIM1_OUT.
29 PB10 bidirectional 5 V tolerant I/O (FT) with alternate functions TIM2_CH3, LPUART1_TX, SPI2_SCK and I2C2_SCL.
30 PB11 bidirectional 5 V tolerant I/O (FT) with alternate functions EVENTOUT, TIM2_CH4, LPUART1_RX and I2C2_SDA.
31 VSS power_in Ground pin for the digital supply; all voltages are referenced to VSS per section 6.1.
32 VDD power_in Digital supply pin; the device operates from a 1.65 V to 3.6 V power supply per the features list.
33 PB12 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI2_NSS/I2S2_WS, LPUART1_RTS_DE and EVENTOUT.
34 PB13 bidirectional 5 V tolerant FM+ capable I/O (FTf) with alternate functions SPI2_SCK/I2S2_CK, LPUART1_CTS, I2C2_SCL and TIM21_CH1.
35 PB14 bidirectional 5 V tolerant FM+ capable I/O (FTf) with alternate functions SPI2_MISO/I2S2_MCK, RTC_OUT, LPUART1_RTS_DE, I2C2_SDA and TIM21_CH2.
36 PB15 bidirectional 5 V tolerant I/O (FT) with alternate function SPI2_MOSI/I2S2_SD and additional function RTC_REFIN.
37 PC6 bidirectional 5 V tolerant I/O (FT) with alternate function TIM22_CH1.
38 PC7 bidirectional 5 V tolerant I/O (FT) with alternate function TIM22_CH2.
39 PC8 bidirectional 5 V tolerant I/O (FT) with alternate function TIM22_ETR.
40 PC9 bidirectional 5 V tolerant I/O (FT) with alternate function TIM21_ETR.
41 PA8 bidirectional 5 V tolerant I/O (FT) with alternate functions MCO, EVENTOUT and USART1_CK.
42 PA9 bidirectional 5 V tolerant I/O (FT) with alternate functions MCO and USART1_TX.
43 PA10 bidirectional 5 V tolerant I/O (FT) with alternate function USART1_RX.
44 PA11 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_MISO, EVENTOUT, USART1_CTS and COMP1_OUT; this pin is supplied by VDDIO2 per the pinout note.
45 PA12 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_MOSI, EVENTOUT, USART1_RTS_DE and COMP2_OUT; this pin is supplied by VDDIO2 per the pinout note.
46 PA13 bidirectional 5 V tolerant I/O (FT) with alternate function SWDIO for serial wire debug.
47 VSS power_in Ground pin for the digital supply; all voltages are referenced to VSS per section 6.1.
48 VDDIO2 power_in Dedicated I/O supply pin that powers PA11 and PA12.
49 PA14 bidirectional 5 V tolerant I/O (FT) with alternate functions SWCLK and USART2_TX for serial wire debug clock.
50 PA15 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_NSS, TIM2_ETR, EVENTOUT, USART2_RX and TIM2_CH1.
51 PC10 bidirectional 5 V tolerant I/O (FT) with alternate function LPUART1_TX.
52 PC11 bidirectional 5 V tolerant I/O (FT) with alternate function LPUART1_RX.
53 PC12 bidirectional 5 V tolerant I/O (FT) with no alternate or additional functions listed.
54 PD2 bidirectional 5 V tolerant I/O (FT) with alternate function LPUART1_RTS_DE.
55 PB3 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_SCK, TIM2_CH2 and EVENTOUT and additional function COMP2_INN.
56 PB4 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_MISO, EVENTOUT and TIM22_CH1 and additional function COMP2_INP.
57 PB5 bidirectional 5 V tolerant I/O (FT) with alternate functions SPI1_MOSI, LPTIM1_IN1, I2C1_SMBA and TIM22_CH2 and additional function COMP2_INP.
58 PB6 bidirectional 5 V tolerant FM+ capable I/O (FTf) with alternate functions USART1_TX, I2C1_SCL and LPTIM1_ETR and additional function COMP2_INP.
59 PB7 bidirectional 5 V tolerant FM+ capable I/O (FTf) with alternate functions USART1_RX, I2C1_SDA and LPTIM1_IN2 and additional functions COMP2_INP and PVD_IN.
60 BOOT0 input Dedicated BOOT0 pin (type B) that selects the boot mode; the device includes a pre-programmed bootloader supporting USART and SPI.
61 PB8 bidirectional 5 V tolerant FM+ capable I/O (FTf) with alternate function I2C1_SCL.
62 PB9 bidirectional 5 V tolerant FM+ capable I/O (FTf) with alternate functions EVENTOUT, I2C1_SDA and SPI2_NSS/I2S2_WS.
63 VSS power_in Ground pin for the digital supply; all voltages are referenced to VSS per section 6.1.
64 VDD power_in Digital supply pin; the device operates from a 1.65 V to 3.6 V power supply per the features list.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package LQFP-64(10x10)
Category Embedded Processors & Controllers
Pins 64

CAD (KiCad official)

  • Symbol: STM32L051R8T6
  • Footprint: Package_QFP:LQFP-64_10x10mm_P0.5mm
  • 3D model: LQFP-64(10x10) (KiCad packages3D, STEP)
  • 3D model files: stm32l051r8t6-etched.step / stm32l051r8t6-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l051r8t6.step / stm32l051r8t6.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (131 pp, sha256 df2ac5c4dfa917ae, retrieved 2026-10-10, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (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