Editing: STM32F103C8T6

Field: AI Skill Technical Reference

# STM32F103C8T6 — ARM Cortex-M3 MCU, 72MHz, 64KB Flash, LQFP-48

**Manufacturer:** STMicroelectronics
**Package:** LQFP-48
**LCSC:** C8734

## Description

The STM32F103C8T6 is a mainstream ARM Cortex-M3 microcontroller from STMicroelectronics. It features 64KB Flash, 20KB SRAM, and runs at up to 72MHz. Popular in embedded projects and the basis for the "Blue Pill" development board.

## Electrical Specifications

- **Core**: ARM Cortex-M3
- **Max Clock**: 72 MHz
- **Flash**: 64 KB
- **SRAM**: 20 KB
- **Operating Voltage**: 2.0V – 3.6V
- **GPIO Pins**: 37
- **ADC**: 2× 12-bit, 10 channels
- **Timers**: 4× 16-bit, 1× SysTick
- **Communication**: USART×3, SPI×2, I2C×2, USB, CAN
- **Package**: LQFP-48

## Pin Configuration

Package: LQFP-48

- Pin 1: VBAT — Battery backup power
- Pin 2: PC13 — GPIO / RTC tamper
- Pin 3: PC14 — GPIO / OSC32_IN
- Pin 4: PC15 — GPIO / OSC32_OUT
- Pin 5: OSC_IN — Main oscillator input
- Pin 6: OSC_OUT — Main oscillator output
- Pin 7: NRST — System reset (active low)
- Pin 8: VSSA — Analog ground
- Pin 9: VDDA — Analog power supply
- Pin 10: PA0 — GPIO / ADC_IN0 / USART2_CTS / TIM2_CH1 / WKUP
- Pin 11: PA1 — GPIO / ADC_IN1 / USART2_RTS / TIM2_CH2
- Pin 12: PA2 — GPIO / ADC_IN2 / USART2_TX / TIM2_CH3
- Pin 13: PA3 — GPIO / ADC_IN3 / USART2_RX / TIM2_CH4
- Pin 14: PA4 — GPIO / ADC_IN4 / SPI1_NSS / USART2_CK
- Pin 15: PA5 — GPIO / ADC_IN5 / SPI1_SCK
- Pin 16: PA6 — GPIO / ADC_IN6 / SPI1_MISO / TIM3_CH1
- Pin 17: PA7 — GPIO / ADC_IN7 / SPI1_MOSI / TIM3_CH2
- Pin 18: PB0 — GPIO / ADC_IN8 / TIM3_CH3
- Pin 19: PB1 — GPIO / ADC_IN9 / TIM3_CH4
- Pin 20: PB2 — GPIO / BOOT1
- Pin 21: PB10 — GPIO / I2C2_SCL / USART3_TX
- Pin 22: PB11 — GPIO / I2C2_SDA / USART3_RX
- Pin 23: VSS — Ground
- Pin 24: VDD — Digital power supply
- Pin 25: PB12 — GPIO / SPI2_NSS / I2C2_SMBA / USART3_CK
- Pin 26: PB13 — GPIO / SPI2_SCK / USART3_CTS
- Pin 27: PB14 — GPIO / SPI2_MISO / USART3_RTS
- Pin 28: PB15 — GPIO / SPI2_MOSI
- Pin 29: PA8 — GPIO / USART1_CK / TIM1_CH1 / MCO
- Pin 30: PA9 — GPIO / USART1_TX / TIM1_CH2
- Pin 31: PA10 — GPIO / USART1_RX / TIM1_CH3
- Pin 32: PA11 — GPIO / USBDM / CAN_RX / TIM1_CH4
- Pin 33: PA12 — GPIO / USBDP / CAN_TX
- Pin 34: SWDIO — Serial wire debug data
- Pin 35: VSS — Ground
- Pin 36: VDD — Digital power supply
- Pin 37: SWCLK — Serial wire debug clock
- Pin 38: PA15 — GPIO / JTDI / TIM2_CH1 / SPI1_NSS
- Pin 39: PB3 — GPIO / JTDO / TRACESWO / TIM2_CH2 / SPI1_SCK
- Pin 40: PB4 — GPIO / JNTRST / TIM3_CH1 / SPI1_MISO
- Pin 41: PB5 — GPIO / I2C1_SMBA / TIM3_CH2 / SPI1_MOSI
- Pin 42: PB6 — GPIO / I2C1_SCL / TIM4_CH1 / USART1_TX
- Pin 43: PB7 — GPIO / I2C1_SDA / TIM4_CH2 / USART1_RX
- Pin 44: BOOT0 — Boot mode selection
- Pin 45: PB8 — GPIO / TIM4_CH3 / I2C1_SCL / CAN_RX
- Pin 46: PB9 — GPIO / TIM4_CH4 / I2C1_SDA / CAN_TX
- Pin 47: VSS — Ground
- Pin 48: VDD — Digital power supply

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