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→Usage
== Usage ==
If using the board, you MUST wire the I/O voltage to the VREF pin (i.e.lower left, 3.3Vpin A20). If you fail to do this the diode clamps may stop I/O lines from being drivable.
See the example photos below where you can see the 3.3V supply being routed to the VREF pin.
== Examples ==
