nibble schematic question

#1

The INT pin of the module
PCA9539 has some connection, could you help me, the connection is not there, can you help me, thanks

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#2

Hey there,

Thank you for your question.

This is the correct schematics; there are no connections on the INT pin.

Let us know if you have any further questions,
Monika

#3

I don’t think it should be left floating. Tie it to ground or V+ depending on the sense of the input.

#4

Based on the data sheet (page 12), I’d suggest: 47K Ohms to Vcc, and 100pF to ground.