# STM32L452RET6

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

STM32L452RET6 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 | VBAT | power_in | Backup battery supply voltage domain, 1.55 V to 3.6 V |
| 2 | PC13 | bidirectional | GPIO port C pin 13, 5V tolerant, RTC tamper/timestamp output and wakeup2 function |
| 3 | PC14-OSC32_IN (PC14) | bidirectional | GPIO port C pin 14, 32 kHz oscillator crystal input |
| 4 | PC15-OSC32_OUT (PC15) | bidirectional | GPIO port C pin 15, 32 kHz oscillator crystal output |
| 5 | PH0-OSC_IN (PH0) | bidirectional | GPIO port H pin 0, 4 to 48 MHz crystal oscillator input |
| 6 | PH1-OSC_OUT (PH1) | bidirectional | GPIO port H pin 1, 4 to 48 MHz crystal oscillator output |
| 7 | NRST | input | Active low reset pin with embedded weak pull-up resistor, 5V tolerant |
| 8 | PC0 | bidirectional | GPIO port C pin 0, 5V tolerant analog switch, ADC1_IN1, LPUART1/I2C/LPTIM functions |
| 9 | PC1 | bidirectional | GPIO port C pin 1, 5V tolerant analog switch, ADC1_IN2, LPUART1/I2C/LPTIM/trace functions |
| 10 | PC2 | bidirectional | GPIO port C pin 2, 5V tolerant analog switch, ADC1_IN3, SPI2/DFSDM/LPTIM functions |
| 11 | PC3 | bidirectional | GPIO port C pin 3, 5V tolerant analog switch, ADC1_IN4, SPI2/SAI/LPTIM functions |
| 12 | VSSA/VREF- | power_in | Analog ground and negative reference voltage |
| 13 | VDDA/VREF+ | power_in | Analog supply and positive reference voltage, 1.62 V to 3.6 V, VREFBUF_OUT capable |
| 14 | PA0 | bidirectional | GPIO port A pin 0, 5V tolerant analog switch, ADC1_IN5/RTC_TAMP2/WKUP1, OPAMP1_VINP, COMP1_INM, TIM2/USART2/SAI/UART4 functions |
| 15 | PA1 | bidirectional | GPIO port A pin 1, 5V tolerant analog switch, ADC1_IN6, OPAMP1_VINM, COMP1_INP, TIM2/I2C1/SPI1/UART4/TIM15 functions |
| 16 | PA2 | bidirectional | GPIO port A pin 2, 5V tolerant analog switch, ADC1_IN7/WKUP4/LSCO, COMP2_INM, TIM2/USART2/LPUART1/QUADSPI/TIM15 functions |
| 17 | PA3 | bidirectional | GPIO port A pin 3, 3.6V tolerant analog switch, ADC1_IN8, OPAMP1_VOUT, COMP2_INP, TIM2/USART2/LPUART1/QUADSPI/SAI/TIM15 functions |
| 18 | VSS | power_in | Ground pin |
| 19 | VDD | power_in | Main supply voltage, 1.71 V to 3.6 V |
| 20 | PA4 | bidirectional | GPIO port A pin 4, 3.6V tolerant analog switch, ADC1_IN9/DAC1_OUT1, COMP1_INM/COMP2_INM, SPI1/USART2/SAI/LPTIM2 functions |
| 21 | PA5 | bidirectional | GPIO port A pin 5, 3.6V tolerant analog switch, ADC1_IN10, COMP1_INM/COMP2_INM, TIM2/SPI1/DFSDM/LPTIM2 functions |
| 22 | PA6 | bidirectional | GPIO port A pin 6, 5V tolerant analog switch/Fm+ I2C, ADC1_IN11, COMP1_OUT, TIM1/TIM3/SPI1/USART3/LPUART1/QUADSPI/TIM16 functions |
| 23 | PA7 | bidirectional | GPIO port A pin 7, 5V tolerant Fm+ I2C/analog switch, ADC1_IN12, COMP2_OUT, TIM1/TIM3/I2C3/SPI1/QUADSPI functions |
| 24 | PC4 | bidirectional | GPIO port A pin 4, 5V tolerant analog switch, ADC1_IN13, COMP1_INM, USART3 function |
| 25 | PC5 | bidirectional | GPIO port C pin 5, 5V tolerant analog switch, ADC1_IN14/WKUP5, COMP1_INP, USART3 function |
| 26 | PB0 | bidirectional | GPIO port B pin 0, 5V tolerant analog switch, ADC1_IN15, COMP1_OUT/SAI/QUADSPI, TIM1/TIM3/SPI1/USART3 functions |
| 27 | PB1 | bidirectional | GPIO port B pin 1, 5V tolerant analog switch, ADC1_IN16, COMP1_INM, TIM1/TIM3/DFSDM/USART3/LPUART1/LPTIM2 functions |
| 28 | PB2 | bidirectional | GPIO port B pin 2, 5V tolerant analog switch, COMP1_INP, RTC_OUT, LPTIM1/I2C3/DFSDM functions |
| 29 | PB10 | bidirectional | GPIO port B pin 10, 5V tolerant Fm+ I2C, COMP1_OUT, TIM2/I2C4/I2C2/SPI2/USART3/LPUART1/QUADSPI/TSC functions |
| 30 | PB11 | bidirectional | GPIO port B pin 11, 5V tolerant Fm+ I2C, COMP2_OUT, TIM2/I2C4/I2C2/USART3/LPUART1/QUADSPI functions |
| 31 | VSS | power_in | Ground pin |
| 32 | VDD | power_in | Main supply voltage, 1.71 V to 3.6 V |
| 33 | PB12 | bidirectional | GPIO port B pin 12, 5V tolerant, TIM1_BKIN/TIM1_BKIN_COMP2, I2C2/SPI2/DFSDM/CAN1/SAI/TIM15 functions |
| 34 | PB13 | bidirectional | GPIO port B pin 13, 5V tolerant Fm+ I2C, TIM1_CH1N, I2C2/SPI2/DFSDM/CAN1/SAI/TIM15 functions |
| 35 | PB14 | bidirectional | GPIO port B pin 14, 5V tolerant Fm+ I2C, TIM1_CH2N, I2C2/SPI2/DFSDM/SAI/TIM15 functions |
| 36 | PB15 | bidirectional | GPIO port B pin 15, 5V tolerant, RTC_REFIN, TIM1_CH3N, SPI2/DFSDM/SAI/TIM15 functions |
| 37 | PC6 | bidirectional | GPIO port C pin 6, 5V tolerant, TIM3_CH1, SDMMC1_D6, DFSDM functions |
| 38 | PC7 | bidirectional | GPIO port C pin 7, 5V tolerant, TIM3_CH2, SDMMC1_D7, DFSDM functions |
| 39 | PC8 | bidirectional | GPIO port C pin 8, 5V tolerant, TIM3_CH3, SDMMC1_D0 function |
| 40 | PC9 | bidirectional | GPIO port C pin 9, 5V tolerant, TIM3_CH4, SDMMC1_D1, USB_NOE functions |
| 41 | PA8 | bidirectional | GPIO port A pin 8, 5V tolerant, MCO output, TIM1/USART1/SAI/DFSDM/LPTIM2 functions |
| 42 | PA9 | bidirectional | GPIO port A pin 9, 5V tolerant Fm+ I2C, USART1_TX, TIM1/I2C1/DFSDM/SAI/TIM15 functions |
| 43 | PA10 | bidirectional | GPIO port A pin 10, 5V tolerant Fm+ I2C, USART1_RX, USB_CRS_SYNC, TIM1/SAI functions |
| 44 | PA11 | bidirectional | GPIO port A pin 11, USB DM signal, 5V tolerant, TIM1/SPI1/COMP1/USART1/CAN functions |
| 45 | PA12 | bidirectional | GPIO port A pin 12, USB DP signal, 5V tolerant, USART1/CAN/SPI1 functions |
| 46 | PA13 (JTMS/SWDIO) | bidirectional |  |
| 47 | VSS | power_in | Ground pin |
| 48 | VDDUSB | power_in | USB supply voltage, 3.0 V to 3.6 V when USB used, 0 to 3.6 V otherwise |
| 49 | PA14 (JTCK/SWCLK) | bidirectional |  |
| 50 | PA15 (JTDI) | bidirectional |  |
| 51 | PC10 | bidirectional | GPIO port C pin 10, 5V tolerant, TRACED1, SPI3/USART3/SDMMC1_D2/TSC functions |
| 52 | PC11 | bidirectional | GPIO port C pin 11, 5V tolerant, SPI3/USART3/SDMMC1_D3/TSC functions |
| 53 | PC12 | bidirectional | GPIO port C pin 12, 5V tolerant, TRACED3, SPI3/USART3/SDMMC1_CK/TSC functions |
| 54 | PD2 | bidirectional | GPIO port D pin 2, 5V tolerant, TRACED2, TIM3_ETR, USART3/SDMMC1_CMD/TSC functions |
| 55 | PB3 (JTDO/TRACESWO) | bidirectional |  |
| 56 | PB4 (NJTRST) | bidirectional |  |
| 57 | PB5 | bidirectional | GPIO port B pin 5, 5V tolerant, LPTIM1_IN1, TIM3/CAN/I2C1/SPI1/SPI3/TSC/COMP2/SAI functions |
| 58 | PB6 | bidirectional | GPIO port B pin 6, 5V tolerant Fm+ I2C/analog switch, USART1_TX, LPUART/CAN/I2C4/TSC/SAI/TIM16 functions |
| 59 | PB7 | bidirectional | GPIO port B pin 7, 5V tolerant Fm+ I2C/analog switch, USART1_RX, LPUART/CAN/I2C/TSC/COMP/SAI/TIM16 functions |
| 60 | PH3-BOOT0 (BOOT0) | bidirectional |  |
| 61 | PB8 | bidirectional | GPIO port B pin 8, 5V tolerant Fm+ I2C, I2C1/CAN/SDMMC1_D4/SAI/TIM16 functions |
| 62 | PB9 | bidirectional | GPIO port B pin 9, 5V tolerant Fm+ I2C, I2C1/SPI2/CAN/SDMMC1_D5/SAI/IR_OUT functions |
| 63 | VSS | power_in | Ground pin |
| 64 | VDD | power_in | Main supply voltage, 1.71 V to 3.6 V |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STM32L452RET6`
- Footprint: `Package_QFP:LQFP-64_10x10mm_P0.5mm`
- 3D model: LQFP-64(10x10) (KiCad packages3D, STEP)
- 3D model files: `stm32l452ret6-etched.step` / `stm32l452ret6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32l452ret6.step` / `stm32l452ret6.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/8588906265627648000) (221 pp, sha256 `0c90cbe36d057ab4`, retrieved 2026-09-29, tier: lcsc)
- **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](docs/stm32l452ret6-datasheet.pdf)