PCA9505/06 - connections of OE, RESET and INT pins

[danielflor]

I'm want to use a PCA9505/06 to expand I/O capabilities in my hardware. But I have doubt about the conections of the CI. The pins of !OE, !RESET and !INT will not be connected to Master Control, only SDA, SCL, VSS and VDD will be connected.

So, can I make !RESET connected to VDD and the other pins, !OE and !INT, left unconnected (floating)?

[JozefKozon]

Dear Daniel,

I apologize for the yesterdays answer. It wasn’t correct. Today I have consulted the case with my colleagues.

RESET pin should be connected to Master controller.

Regarding the OE pin. If you want to have all the I/O pins turned on constantly, connect the OE pin straight to the ground. Eventually you can also connect the OE pin to Master Controller.

If you don’t want to use the interrupt function, you can leave the INT pin unconnected (floating).

Best regards,

Jozef.

[danielflor]

Thank you Jozef, no problem, but I need to reduce the amout of lines of my design. Is there a motive to not to do a pull-up or pull-down at RESET pin ? 

About OE pin, putting it straight to the ground,  allows me to to use I/Os pins as I/O, I mean, I still can configure them individually as input or as output, is it right?