# STM8L052R8T6

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

STM8L052R8T6 from STMicroelectronics, in a LQFP-64(10x10). 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 | PA0 | bidirectional | Port A0 configurable as general purpose I/O, SWIM debug interface, beep output, or infrared timer output; high sink LED driver capability. |
| 2 | NRST/PA1 | bidirectional | Power-on reset input or configurable as Port A1 general purpose output only with push-pull or open-drain configuration; external interrupt source. |
| 3 | PA2 | bidirectional | Port A2 configurable as general purpose I/O, HSE oscillator input, alternate USART1 transmit, or alternate SPI1 MISO; 5V tolerant. |
| 4 | PA3 | bidirectional | Port A3 configurable as general purpose I/O, HSE oscillator output, alternate USART1 receive, or alternate SPI1 MOSI; 5V tolerant. |
| 5 | PA4 | bidirectional | Port A4 configurable as general purpose I/O, Timer 2 break input, alternate Timer 2 trigger, LCD common 0, or ADC1 input channel 2; 5V tolerant. |
| 6 | PA5 | bidirectional | Port A5 configurable as general purpose I/O, Timer 3 break input, alternate Timer 3 trigger, LCD common 1, or ADC1 input channel 1; 5V tolerant. |
| 7 | PA6 | bidirectional | Port A6 configurable as general purpose I/O, alternate ADC1 trigger, LCD common 2, or ADC1 input channel 0; 5V tolerant. |
| 8 | PA7 | bidirectional | Port A7 configurable as general purpose I/O, LCD segment 0, or Timer 5 channel 1; 5V tolerant. |
| 9 | VSSA/VREF- | power_in | Analog ground voltage and ADC1 negative voltage reference; must be connected to VSS; supply range 1.8 to 3.6 V. |
| 10 | VSS1 | power_in | I/O and digital power supply ground return; must not be left unconnected; supply range 1.8 to 3.6 V. |
| 11 | VDD1 | power_in | Digital power supply voltage for I/Os and internal regulator; must not be left unconnected; supply range 1.8 to 3.6 V. |
| 12 | VDDA | power_in | Analog supply voltage for ADC peripherals; must be connected to VDD; supply range 1.8 to 3.6 V. |
| 13 | VREF+ | power_in | ADC1 positive voltage reference; must be provided externally; supply range 1.8 to 3.6 V. |
| 14 | PG0 | bidirectional | Port G0 configurable as general purpose I/O, USART3 receive, or alternate Timer 2 break input; 5V tolerant. |
| 15 | PG1 | bidirectional | Port G1 configurable as general purpose I/O, USART3 transmit, or alternate Timer 3 break input; 5V tolerant. |
| 16 | PG2 | bidirectional | Port G2 configurable as general purpose I/O or USART3 synchronous clock; 5V tolerant. |
| 17 | PG3 | bidirectional | Port G3 configurable as general purpose I/O or alternate Timer 3 external trigger; 5V tolerant. |
| 18 | VLCD | power_in | LCD booster external capacitor connection for internal step-up converter to guarantee contrast control; supply range 1.8 to 3.6 V. |
| 19 | PE0 | bidirectional | Port E0 configurable as general purpose I/O, LCD segment 1, Timer 5 channel 2, or RTC tamper 1 detection input; 5V tolerant. |
| 20 | PE1 | bidirectional | Port E1 configurable as general purpose I/O, Timer 1 inverted channel 2, LCD segment 2, or RTC tamper 2 detection input; 5V tolerant. |
| 21 | PE2 | bidirectional | Port E2 configurable as general purpose I/O, Timer 1 inverted channel 3, LCD segment 3, or RTC tamper 3 detection input; 5V tolerant. |
| 22 | PE3 | bidirectional | Port E3 configurable as general purpose I/O, LCD segment 4, or USART2 receive; 5V tolerant. |
| 23 | PE4 | bidirectional | Port E4 configurable as general purpose I/O, LCD segment 5, or USART2 transmit; 5V tolerant. |
| 24 | PE5 | bidirectional | Port E5 configurable as general purpose I/O, LCD segment 6, ADC1 input channel 23, or USART2 synchronous clock; 5V tolerant. |
| 25 | PD0 | bidirectional | Port D0 configurable as general purpose I/O, Timer 3 channel 2, alternate ADC1 trigger, LCD segment 7, or ADC1 input channel 22; 5V tolerant. |
| 26 | PD1 | bidirectional | Port D1 configurable as general purpose I/O, Timer 3 external trigger, LCD common 3, or ADC1 input channel 21; 5V tolerant. |
| 27 | PD2 | bidirectional | Port D2 configurable as general purpose I/O, Timer 1 channel 1, LCD segment 8, or ADC1 input channel 20; 5V tolerant. |
| 28 | PD3 | bidirectional | Port D3 configurable as general purpose I/O, Timer 1 external trigger, LCD segment 9, or ADC1 input channel 19; 5V tolerant. |
| 29 | VDD3 | power_in | I/O supply voltage; must not be left unconnected; supply range 1.8 to 3.6 V. |
| 30 | VSS3 | power_in | I/O ground return; must not be left unconnected; supply range 1.8 to 3.6 V. |
| 31 | PB0 | bidirectional | Port B0 configurable as general purpose I/O, Timer 2 channel 1, LCD segment 10, or ADC1 input channel 18; 5V tolerant; pull-up applied during reset, input floating after reset release. |
| 32 | PB1 | bidirectional | Port B1 configurable as general purpose I/O, Timer 3 channel 1, LCD segment 11, or ADC1 input channel 17; 5V tolerant. |
| 33 | PB2 | bidirectional | Port B2 configurable as general purpose I/O, Timer 2 channel 2, LCD segment 12, or ADC1 input channel 16; 5V tolerant. |
| 34 | PB3 | bidirectional | Port B3 configurable as general purpose I/O, Timer 2 external trigger, LCD segment 13, or ADC1 input channel 15; 5V tolerant. |
| 35 | PB4 | bidirectional | Port B4 configurable as general purpose I/O, alternate SPI1 master/slave select, LCD segment 14, or ADC1 input channel 14; 5V tolerant; pull-up applied during reset. |
| 36 | PB5 | bidirectional | Port B5 configurable as general purpose I/O, alternate SPI1 clock, LCD segment 15, or ADC1 input channel 13; 5V tolerant. |
| 37 | PB6 | bidirectional | Port B6 configurable as general purpose I/O, alternate SPI1 master out/slave in, LCD segment 16, or ADC1 input channel 12; 5V tolerant. |
| 38 | PB7 | bidirectional | Port B7 configurable as general purpose I/O, alternate SPI1 master in/slave out, LCD segment 17, or ADC1 input channel 11; 5V tolerant. |
| 39 | PF0 | bidirectional | Port F0 configurable as general purpose I/O, ADC1 input channel 24, or alternate USART3 transmit. |
| 40 | PF1 | bidirectional | Port F1 configurable as general purpose I/O, ADC1 input channel 25, or alternate USART3 receive. |
| 41 | PF4 | bidirectional | Port F4 configurable as general purpose I/O, LCD segment 36, or LCD common 4 with SEG/COM multiplexing available; 5V tolerant. |
| 42 | PF5 | bidirectional | Port F5 configurable as general purpose I/O, LCD segment 37, or LCD common 5 with SEG/COM multiplexing available; 5V tolerant. |
| 43 | PF6 | bidirectional | Port F6 configurable as general purpose I/O, LCD segment 38, or LCD common 6 with SEG/COM multiplexing available; 5V tolerant. |
| 44 | PF7 | bidirectional | Port F7 configurable as general purpose I/O, LCD segment 39, or LCD common 7 with SEG/COM multiplexing available; 5V tolerant. |
| 45 | PD4 | bidirectional | Port D4 configurable as general purpose I/O, Timer 1 channel 2, LCD segment 18, or ADC1 input channel 10; 5V tolerant. |
| 46 | PD5 | bidirectional | Port D5 configurable as general purpose I/O, Timer 1 channel 3, LCD segment 19, or ADC1 input channel 9; 5V tolerant. |
| 47 | PD6 | bidirectional | Port D6 configurable as general purpose I/O, Timer 1 break input, LCD segment 20, ADC1 input channel 8, RTC calibration input, or internal voltage reference output; 5V tolerant. |
| 48 | PD7 | bidirectional | Port D7 configurable as general purpose I/O, Timer 1 inverted channel 1, LCD segment 21, ADC1 input channel 7, RTC alarm output, or internal voltage reference output; 5V tolerant. |
| 49 | PG4 | bidirectional | Port G4 configurable as general purpose I/O or SPI2 master/slave select; 5V tolerant. |
| 50 | PG5 | bidirectional | Port G5 configurable as general purpose I/O or SPI2 clock; 5V tolerant. |
| 51 | PG6 | bidirectional | Port G6 configurable as general purpose I/O or SPI2 master out/slave in; 5V tolerant. |
| 52 | PG7 | bidirectional | Port G7 configurable as general purpose I/O or SPI2 master in/slave out; 5V tolerant. |
| 53 | PC0 | bidirectional | Port C0 configurable as general purpose I/O or I2C1 serial data with true open-drain output; 5V tolerant without protection diode to VDD. |
| 54 | PC1 | bidirectional | Port C1 configurable as general purpose I/O or I2C1 serial clock with true open-drain output; 5V tolerant without protection diode to VDD. |
| 55 | VDD2 | power_in | I/O supply voltage; must not be left unconnected; supply range 1.8 to 3.6 V. |
| 56 | VSS2 | power_in | I/O ground return; must not be left unconnected; supply range 1.8 to 3.6 V. |
| 57 | PC2 | bidirectional | Port C2 configurable as general purpose I/O, USART1 receive, LCD segment 22, ADC1 input channel 6, or internal voltage reference output; 5V tolerant. |
| 58 | PC3 | bidirectional | Port C3 configurable as general purpose I/O, USART1 transmit, LCD segment 23, or ADC1 input channel 5; 5V tolerant. |
| 59 | PC4 | bidirectional | Port C4 configurable as general purpose I/O, USART1 synchronous clock, I2C1 SMBus interface, configurable clock output, or ADC1 input channel 4; 5V tolerant. |
| 60 | PC5 | bidirectional | Port C5 configurable as general purpose I/O, LSE oscillator input, alternate SPI1 master/slave select, or alternate USART1 transmit; 5V tolerant. |
| 61 | PC6 | bidirectional | Port C6 configurable as general purpose I/O, LSE oscillator output, alternate SPI1 clock, or alternate USART1 receive; 5V tolerant. |
| 62 | PC7 | bidirectional | Port C7 configurable as general purpose I/O or ADC1 input channel 3; 5V tolerant. |
| 63 | PE6 | bidirectional | Port E6 configurable as general purpose I/O, programmable voltage detector input, or Timer 5 break input; 5V tolerant. |
| 64 | PE7 | bidirectional | Port E7 configurable as general purpose I/O or Timer 5 external trigger; 5V tolerant. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STM8L052R8T6`
- Footprint: `Package_QFP:LQFP-64_10x10mm_P0.5mm`
- 3D model: LQFP-64(10x10) (KiCad packages3D, STEP)
- 3D model files: `stm8l052r8t6-etched.step` / `stm8l052r8t6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm8l052r8t6.step` / `stm8l052r8t6.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/8586175707394924544) (55 pp, sha256 `c6e456a46f9e5c98`, retrieved 2026-09-22, tier: lcsc)
- **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/stm8l052r8t6-datasheet.pdf)