We saw this nifty chip on the nicechips sub-reddit a few months ago and got a few samples. Recently we were thinking how we could really use this chip in a more complex design that could use a GPIO expander. So…it’s time to make a STEMMA breakout! This I2C expander driver has 16 constant-current LED drivers and I/O pins. It seems pretty straightforward, just watch out for the address line ‘default pin values’ and the reset pin’s internal pulldown. This breakout is looooooong so that you get every IO pin plus a matching ground pad.
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