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    And I’m in the habit of using the names VCC for the power and GND for, well, the ground. But the datasheet uses VDD for power and VSS for ground. And I’d mixed up these two connections. Gah!

    This bit me too on my first PCB just earlier this month! Except I made the mistake that “VSS” = “Source” must be the “source” of power, instead of the “source” of electrons :(