This is an ARM core board based on STM32F103C8T6 as the main chip.

The features are as follows:

1. The most basic circuit based on MCU, 8M and 32768 crystal circuits, USB power circuit are onboard.

2. The core board is divided into two rows to lead all I / O ports.

3. With SWD simulation debugging download interface, it is simple and convenient, and the debugging speed is fast.

4. The Mirco USB interface is used for USB communication and power supply. The USB interface is compatible with the ordinary Android phone charger interface.

6. RTC crystal uses Epson brand, which is easy to start and more stable.

Chip introduction:

1、STM32F103C8T6

Package type: LQFP;

Number of pins: 48;

Core: Cortex-M3;

Working frequency: 72MHz;

Storage resources: 64K Byte Flash, 20KByte SRAM;

Interface resources: 2x SPI, 3x USART, 2x I2C, 1x CAN, 37x I / O port,

Analog-to-digital conversion: 2x ADC (12 bits / 16 channels)

Timer: 3 ordinary timers and 1 advanced timer

Debug download: support debug download of JTAG / SWD interface, support IAP.

2. RT9193: 3.3V voltage regulator chip, the maximum output is 300mA.

Interface introduction:

1. SWD interface: support simulation, download and debugging.

2. Mirco USB interface: power supply and USB communication function, does not support download.

3. USART1 interface: It can be used to download programs with USART1 or to communicate with USART1.

4. MCU pin interface: lead out all I / O port pins to facilitate connection with peripherals.

5. 5V and 3.3V power input and output interface: commonly used for external power supply or common ground processing with other modules

Introduction to other devices:

1. Power LED (PWR): Power indication status, can judge whether the power is stable.

2. User LED (PC13): It is convenient for I / O output test or to indicate program running status.

3. Start the jump to choose the programming mode: (1, user flash memory 2, SRAM 3, system memory).

RAM 3, system memory).

4. Reset button: used for user to reset the chip program.

5. 8M crystal oscillator: The system main frequency can be 72MHz through frequency multiplication setting.

6. 32.768KHz crystal: It can be used by built-in RTC or used for calibration.