{"id":25943490,"url":"https://github.com/cfrankb/pcb_ch552_devboard","last_synced_at":"2026-03-05T21:03:11.451Z","repository":{"id":279517402,"uuid":"875321929","full_name":"cfrankb/pcb_ch552_devboard","owner":"cfrankb","description":"CH552 Devboard with ON/OFF switch, BOOT and RESET buttons. 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The board is intended to aid in the development of firmware/prototype for the CH552 and CH554 microcontrollers.\n\n* The Power Switch (Workflow Optimization):\nThe CH552 enters ISP (programming) mode based on power-on state with a specific pin held. Constantly pulling a USB cable wears out the connector and is inefficient. Your switch demonstrates mechanical sympathy and an understanding of the iterative development cycle.\n\n* The \"Ground Forest\" (Signal Integrity):\nAdding 12x GND pins isn't overkill—it's professional. It allows you to clip a logic analyzer, an oscilloscope probe, and multiple peripherals simultaneously without creating a \"rat's nest\" of wires sharing a single pin.\n\n* The \"Ground Forest\" (Signal Integrity): \n Having 4 LEDs dedicated to the MCU pins allows for immediate visual confirmation of state machines or \"heartbeat\" signals without needing to wire up external breadboard components.\n\n\n\nhttps://github.com/cfrankb/ch552_drivers/\n\n\n## Schematic\n![Image](images/sch_revision0.png \"icon\")\n\n\n![Image](images/revision0a.png \"icon\")\n\n## Features\n\n * 4 led to provide indicators\n * 12x GND pins\n * 6x 3.3v pins\n * 6x 5v pins\n * ON/OFF button\n * BOOT and RESET buttons\n\n![Image](images/20241019_164148-crop.jpg \"icon\")\n\n## Part List\n\n|     | Part #        | REF#                   | Package            |\n| --- | ------------- | ---------------------- | ------------------ |\n| 1x  | 10u C         | C3                     | 0805               |\n| 2x  | 100n C        | C1, C2                 | 1206               |\n| 2x  | 10k Resistor  | R1, R4                 | 0805               |\n| 6x  | 1k Resistor   | R2, R3, R5, R6, R7, R8 | 0805               |\n| 1x  | Green Led     | D1                     | 0805               |\n| 5x  | Leds          | D2, D3, D4, D5, D6     | 0805               |\n| 1x  | CH552G/CH554G | U1                     | SOP16              |\n| 2x  | button        | SW1, SW2               | 6x6x4.3mm DIP      |\n| 1x  | USB Connector | J1                     | USB 2.0 Female DIP |\n| 1x  | 1x07          | J2                     | 2.54mm pins DIP    |\n| 1x  | 2x03          | J3, J5, J6, J7         | 2.54mm pins DIP    |\n| 1x  | 1x05          | J4                     | 2.54mm pins DIP    |\n| 1x  | 1x04          | J8                     | 2.54mm pins DIP    |\n| 1x  | 1x03          | J9                     | SS12D00 DIP *      |\n\n\\* You can also use a 2.54mm pin header with a jumper cap.\n\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcfrankb%2Fpcb_ch552_devboard","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcfrankb%2Fpcb_ch552_devboard","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcfrankb%2Fpcb_ch552_devboard/lists"}