{"id":19028,"date":"2023-01-20T15:29:41","date_gmt":"2023-01-20T08:29:41","guid":{"rendered":"https:\/\/www.makeriot2020.com\/?p=19028"},"modified":"2023-01-20T15:29:46","modified_gmt":"2023-01-20T08:29:46","slug":"redesigning-my-mcp23017-breakout","status":"publish","type":"post","link":"https:\/\/www.makeriot2020.com\/index.php\/2023\/01\/20\/redesigning-my-mcp23017-breakout\/","title":{"rendered":"Redesigning my MCP23017 breakout"},"content":{"rendered":"\n

In a previous post<\/a>, I designed a breadboard-friendly MCP23017 breakout module. A few months have passed, and after using the module for a while, some issues came to light… <\/p>\n\n\n\n

In this post, I will show you how I have fixed those issues, and then I can continue testing\/using the new generation prototype, and hopefully, it can become the final revision of this project.<\/p>\n\n\n\n

Old Versus New
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Let us start by looking at the old and new PCB designs… <\/p>\n\n\n\n

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Old style MCP23017 Breakout – Top view<\/figcaption><\/figure>\n\n\n\n
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New style MCP23017 Breakout – Top view<\/figcaption><\/figure>\n\n\n\n

There will not be a lot of obvious differences at first, but if we look closely, here are the changes:
– In the old version, due to the size of the SOIC28 footprint, I had to place the bypass capacitors, as well as I2C pullup resistors on the bottom layer of the PCB.<\/p>\n\n\n\n