[Hangshun Training Camp] Development board based on HK103RBT6

Learning development board based on HK103RBT6. The power input can choose 9V-20V DC wide voltage input or USB power supply, and is equipped with over-current protection; in order to ensure the power quality, TVS diodes are used at the output end of each power module to suppress transient voltages, and to reduce the power consumption of WIFI, Bluetooth, etc. Large modules are powered separately; each power supply has an independent working light to display the current working status of the power supply part; in order to reduce the PCB area, 0603 packaged SMD components are selected as much as possible in component selection; the USB interface is selected The commonly used Type-C interface is currently used, and the position of the impedance matching resistor is reserved; the CH340 part is designed with a one-click download circuit; the unused pins are all led out from the wiring strip; the backup power supply part can use a battery box or supercapacitor as needed. In terms of function, in order to maximize the effectiveness of the chip, the design idea of ​​reusing some functional pin connectors is adopted: 1. The USART1 (PA9, PA10) pins are connected to the CH340 chip using a plug-in connection. If you want to use USART1 alone Function pin, you can use Dupont wire to lead out the pin; 2. The USART2 (PA2, PA3) pin can be selected with a jumper cap to select the WIFI module or Bluetooth module; 3. The USART3 (PC10, PC11) pin can be selected with a jumper cap I2C or 485; 4. The PA11 and PA12 pins can use jumper caps to select the chip to work in USB mode or output in CAN bus mode. The development board is equipped with three key switches (PA0, PA4, PA15) to control pin input, and two LED lights (PA8, PD2) to display pin output. It is also equipped with E2PROM and FLASH chips, and is compatible with punctual atomic LCD and OLED. screen, convenient for learning and development. The shortcomings of the development board are that the analog ground and digital ground are not effectively isolated, and there is room for improvement in the arrangement of components. These problems will be solved in future designs.