Overview

Open103C is an STM32 development board that features an STM32F103CBT6 device as the microcontroller. There are further expansions with various optional accessory boards for specific application. The modular and open design makes it the ideal for starting application development with STM32F family.

What's On Board

1. STM32F103CBT6:the high performance STM32 MCU which features
   • Core: ARM Cortex-M3 32-bit RISC
   • Operating Frequency: 72MHz, 1.25 DMIPS/MHz
   • Operating Voltage: 2-3.6V
   • Package: LQFP48
   • I/Os: 37
   • Memories: 128kB Flash, 20kB RAM
   • Communication Interfaces: 2 x SPI, 3 x USART, 2 x I2C, 1 x USB, 1 x CAN
   • AD & DA converters: 2 x AD (12-bit, 1μs, shares 10 channels)
   • Debugging/Programming: supports JTAG/SWD (serial wire debug) interfaces, supports IAP
2. AMS1117-3.3: 3.3V voltage regulator
3. Power supply switch: 5V DC or USB
4. Power indicator
5. LEDs: for indicating I/O status or program debugging running state
6. Reset button
7. User key: for I/O input test
8. Joystick: for I/O input test (five positions)
9. 32.768K crystal oscillator: used for internal RTC, also supports clock calibration
10. 8M crystal oscillator: enables the MCU run at 72M frequency by frequency multiplication
11. 8 I/O Interface: easily connects to keypad, motor, etc.
12. CAN interface: communicates with accessory board which features the CAN device conveniently
13. SPI1 / SPI2 interface
• easily connects to SPI peripherals such as FLASH (AT45DBxx), SD card, MP3, etc.
• convenient for connecting AD module, thanks to the SPI1 alternative AD function
14. I2C1 / I2C2 interface: easily connects to I2C peripherals such as I/O expander (PCF8574), EEPROM (AT24Cxx), etc.
15. LCD interface: easily connects to the touch screen LCD
16. ONE-WIRE interface: easily connects to ONE-WIRE devices (TO-92 package), such as temperature sensor (DS18B20), electronic registration number (DS2401), etc.
17. USART1 interface: easily connects to RS232, RS485, USB TO 232
18. USART2 interface: easily connects to RS232, RS485, USB TO 232
19. USB port: USB communication between board and PC
20. 5V DC jack
21. 5V/3.3 V power input/output, usually used for power output, or common ground with other user board
22. MCU pins connector: all the MCU pins are accessible on expansion connectors for further expansion
23. JTAG/SWD interface: for debugging/programming
24. Boot mode selection: for configuring the BOOT0 and BOOT1 pins
25. USB enable jumper
    • short the jumper to enable the PC auto detection while USB connecting
    • open the jumper to disable
26. LEDs jumper
    • short the jumper to connect the LEDs to I/Os used in example code
    • open the jumper to connect the LEDs to other custom pins via jumper wires
27. User key jumper
    • short the jumper to connect the user key to I/Os used in example code
    • open the jumper to connect the user key to other custom pins via jumper wires
28. Joystick jumper
    • short the jumper to connect the joystick to I/Os used in example code
    • open the jumper to connect the joystick to other custom pins via jumper wires
29. VBAT selection jumper
    • short the jumper to use system power supply
    • open the jumper to connect the VBAT to external power, such as battery

Photos

Note:
The Open103C supports programming via STM32 USART bootloader, a USB TO UART accessory board is also provided in the package.
The Open103C does NOT integrate any debugging function, a debugger is required.

JTAG/SWD Interfaces

The figure 1, and 2 show the header pinouts of JTAG/SWD interface

Development Resources

• Related software (KEIL etc.)
• Demo code (examples in C, μC/OS-II)
• Schematic (PDF)
• STM32 development documentations (Datasheet etc.)

Wiki: www.waveshare.com/wiki/Open103C