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Introduction
This is the MM32 main control board circuit with version number 1.6.1.In this version of the circuit, the NOR Flash chip is changed to a chip SD card, and the GL823K chip is used to realize the reading and writing of the SD card through the USB interface. The devices connected to the SD card can be controlled by the microcontroller.
This board is designed with a four-layer board and uses the JLC7628 laminate structure for 50-ohm impedance matching of transmission lines. Since the PCB is designed with a direct connection to the power supply copper cladding, it requires a relatively long heating time for the solder tray to be tinned during soldering. Care needs to be taken not to have false soldering when soldering.
File
- circuit.zip: Contains PCBs, schematics and exported Gerber files drawn by KiCAD.