# STM32L052C8T6

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · LQFP-48(7x7)

STM32L052C8T6 from STMicroelectronics, in a LQFP-48(7x7). 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 | Power supply input, 1.8-3.6 V for core and peripheral logic operation. |
| 2 | PC13 | bidirectional | GPIO port C bit 13 (5V-tolerant I/O) with RTC tamper/timestamp/wakeup event alternate functions. |
| 3 | PC14-OSC32_IN | bidirectional | 32.768 kHz oscillator input for RTC clock or GPIO port C bit 14 (5V-tolerant I/O). |
| 4 | PC15-OSC32_OUT | bidirectional | 32.768 kHz oscillator output or GPIO port C bit 15 with standard 3.3 V I/O. |
| 5 | PH0-OSC_IN | bidirectional | External 1-25 MHz oscillator input or GPIO port H bit 0 with standard 3.3 V I/O. |
| 6 | PH1-OSC_OUT | bidirectional | External oscillator output or GPIO port H bit 1 with standard 3.3 V I/O. |
| 7 | NRST | bidirectional | Bidirectional reset pin with 45 kΩ weak pull-up resistor and 50 ns digital filter for device reset. |
| 8 | VSSA | power_in | Analog ground (0 V) reference for ADC, DAC, and comparators in single-supply operation. |
| 9 | VDDA | power_in | Analog power supply, 1.8-3.6 V (minimum 1.8 V with DAC enabled) for analog peripherals. |
| 10 | PA0 | bidirectional | GPIO port A bit 0 (3.3 V standard I/O), ADC channel 0, RTC wakeup input 1, and TIM2 channel 1 capture/compare. |
| 11 | PA1 | bidirectional | GPIO port A bit 1 (5V-tolerant) with ADC channel 1, TIM2 channel 2, and USART2 RTS_DE alternate functions. |
| 12 | PA2 | bidirectional | GPIO port A bit 2 (5V-tolerant) with ADC channel 2, USART2 TX, and COMP2 output alternate functions. |
| 13 | PA3 | bidirectional | GPIO port A bit 3 (5V-tolerant) with ADC channel 3 and USART2 RX alternate function. |
| 14 | PA4 | bidirectional | GPIO port A bit 4 (3.3 V standard I/O) with DAC output and ADC channel 4; reduced touch sensing sensitivity. |
| 15 | PA5 | bidirectional | GPIO port A bit 5 (3.3 V standard I/O) with ADC channel 5, SPI1 SCK, and TIM2 capture/compare functions. |
| 16 | PA6 | bidirectional | GPIO port A bit 6 (5V-tolerant) with ADC channel 6, SPI1 MISO, and COMP1 output alternate functions. |
| 17 | PA7 | bidirectional | GPIO port A bit 7 (5V-tolerant) with ADC channel 7, SPI1 MOSI, and COMP2 output alternate functions. |
| 18 | PB0 | bidirectional | GPIO port B bit 0 (5V-tolerant) with ADC channel 8 and internal VREF output capability. |
| 19 | PB1 | bidirectional | GPIO port B bit 1 (5V-tolerant) with ADC channel 9 and internal VREF output capability. |
| 20 | PB2 | bidirectional | GPIO port B bit 2 (5V-tolerant) with LPTIM1 output and TSC synchronization alternate functions. |
| 21 | PB10 | bidirectional | GPIO port B bit 10 (5V-tolerant) with TIM2 channel 3, LPUART1 TX, SPI2 SCK, and I2C2 SCL alternate functions. |
| 22 | PB11 | bidirectional | GPIO port B bit 11 (5V-tolerant) with TIM2 channel 4, LPUART1 RX, and I2C2 SDA alternate functions. |
| 23 | VSS | power_in | Digital ground (0 V) reference for microcontroller core and peripheral logic. |
| 24 | VDD | power_in | Power supply input, 1.8-3.6 V for core and peripheral logic operation. |
| 25 | PB12 | bidirectional | GPIO port B bit 12 (5V-tolerant) with SPI2 NSS/I2S2 WS, LPUART1 RTS_DE, and I2C2 SMBA alternate functions. |
| 26 | PB13 | bidirectional | GPIO port B bit 13 (Fast Mode+ 20 mA capable, 5V-tolerant) with SPI2 SCK, I2C2 SCL, and TIM21 CH1 alternate functions. |
| 27 | PB14 | bidirectional | GPIO port B bit 14 (Fast Mode+ 20 mA capable, 5V-tolerant) with SPI2 MISO, I2C2 SDA, and TIM21 CH2 alternate functions. |
| 28 | PB15 | bidirectional | GPIO port B bit 15 (5V-tolerant) with SPI2 MOSI and RTC reference clock input alternate functions. |
| 29 | PA8 | bidirectional | GPIO port A bit 8 (5V-tolerant) with MCO output and USART1 CK alternate functions. |
| 30 | PA9 | bidirectional | GPIO port A bit 9 (5V-tolerant) with MCO output and USART1 TX alternate function. |
| 31 | PA10 | bidirectional | GPIO port A bit 10 (5V-tolerant) with USART1 RX and TSC group 4 I/O alternate functions. |
| 32 | PA11 | bidirectional | GPIO port A bit 11 (5V-tolerant, powered by VDD_USB) providing USB_DM with internal 1.5 kΩ pull-up. |
| 33 | PA12 | bidirectional | GPIO port A bit 12 (5V-tolerant, powered by VDD_USB) providing USB_DP (USB D+ signal line). |
| 34 | PA13 | bidirectional | GPIO port A bit 13 (5V-tolerant) providing Serial Wire Debug SWDIO interface and USB_NOE alternate function. |
| 35 | VSS | power_in | Digital ground (0 V) reference for microcontroller core and peripheral logic. |
| 36 | VDD_USB | power_in | USB transceiver power supply, 3.0-3.6 V (3.0 V minimum required for USB compliance). |
| 37 | PA14 | bidirectional | GPIO port A bit 14 (5V-tolerant) providing Serial Wire Clock SWCLK interface and USART2 TX alternate function. |
| 38 | PA15 | bidirectional | GPIO port A bit 15 (5V-tolerant) with USART2 RX, TIM2 capture/compare, and SPI1 NSS alternate functions. |
| 39 | PB3 | bidirectional | GPIO port B bit 3 (5V-tolerant) with COMP2 inverted input, SPI1 SCK, and TIM2 channel 2 alternate functions. |
| 40 | PB4 | bidirectional | GPIO port B bit 4 (5V-tolerant) with COMP2 non-inverted input, SPI1 MISO, and TIM22 channel 1 alternate functions. |
| 41 | PB5 | bidirectional | GPIO port B bit 5 (5V-tolerant) with COMP2 non-inverted input, SPI1 MOSI, and TIM22 channel 2 alternate functions. |
| 42 | PB6 | bidirectional | GPIO port B bit 6 (Fast Mode+ 20 mA capable, 5V-tolerant) with COMP2 non-inverted input and I2C1 SCL alternate function. |
| 43 | PB7 | bidirectional | GPIO port B bit 7 (Fast Mode+ 20 mA capable, 5V-tolerant) with COMP2 non-inverted input and I2C1 SDA alternate function. |
| 44 | BOOT0 | input | Boot mode selection pin sampled during power-on or external reset; 0 = Boot from Flash, 1 = Boot from System Memory. |
| 45 | PB8 | bidirectional | GPIO port B bit 8 (Fast Mode+ 20 mA capable, 5V-tolerant) with I2C1 SCL and TSC synchronization alternate functions. |
| 46 | PB9 | bidirectional | GPIO port B bit 9 (Fast Mode+ 20 mA capable, 5V-tolerant) with I2C1 SDA and SPI2 NSS/I2S2 WS alternate functions. |
| 47 | VSS | power_in | Digital ground (0 V) reference for microcontroller core and peripheral logic. |
| 48 | VDD | power_in | Power supply input, 1.8-3.6 V for core and peripheral logic operation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | LQFP-48(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 48 |

## CAD (KiCad official)

- Symbol: `STM32L052C8T6`
- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`
- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `stm32l052c8t6-etched.step` / `stm32l052c8t6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32l052c8t6.step` / `stm32l052c8t6.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/8586181756575342592) (143 pp, sha256 `501c06e19fb3cdbd`, retrieved 2026-09-26, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/stm32l052c8t6-datasheet.pdf)