MM32F031K8 Minimum System Board

 MM32F031K8 minimum system board, onboard USB to TTL

MM32 microcontroller features:

• MM32 is a domestic high-performance 32-bit microcontroller developed by Shanghai Lingdong Technology. The MM32F031 series is based on the ARM® Cortex®-M0 processor core, with a maximum frequency of 72MHz. Compared with the STM32F0 series, the maximum frequency is 48MHz, which means a faster operating speed. At the same time, the power supply range of MM32 reaches 2.0V~5.5V, and all pins can input and output 5V, providing greater convenience for actual use.

System board description

• This chip is MM32F031K8U6 in QFN-32 package , with 64k flash memory and 8k SRAM, 27 GPIO ports, 4 general-purpose 16-bit timers, 1 general-purpose 32-bit timer, 1 advanced timing, 2 UARTs, 1 IIC, 1 SPI and 10-channel ADC are rich in resources.
• This system board not only contains the minimum system design, but also adds a USB to TTL circuit. It uses a CH340E chip in a MOSP-10 package and only occupies a small PCB space. Therefore, you only need to connect the data cable to the MICRO on the system board. By connecting the ports, power supply and serial port communication can be realized. There is no need to connect through external Dupont lines, avoiding the trouble of wiring.
• For voltage selection, there are two jumpers on the bottom layer, namely 5V and 3.3V jumpers. In actual use, you can use a soldering iron to change the short-circuit point according to actual voltage needs.

• The system board is equipped with a total of 4 status indicators, namely power indicator, serial port TX & RX indicator and a user light, which can more clearly check the running status of the program.
• In terms of power supply protection, the system includes a PTC self-restoring fuse with a maximum current of 500mA. Once a short circuit or other excessive current occurs, the power supply can be automatically disconnected to ensure that the chip will not be damaged;
• In terms of voltage protection, a 5V & 3.3V ESD protection diode is connected in parallel to both ends of the LDO to protect the system board from external static electricity or other voltage impacts.
• For program downloading and debugging, there is a SWD interface, which can be downloaded and debugged using DAP-LINK, ST-LINK or J-LINK, and soft reset can also be achieved.

appendix:

• The KEIL installation package for all series of MM32 chips is given in the attachment. You can install it by double-clicking it. The other attachment is the official example. Just select the chip type when using it.