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Topic: Multiple input - outputs (Read 449 times) previous topic - next topic

Paul__B



Now that is looking neat.

My recommendation is to use the module I linked in reply #1.

(I ordered one when I looked it up.  :smiley-lol: )

Robi26

#16
May 24, 2019, 01:27 pm Last Edit: May 24, 2019, 01:29 pm by Robi26
I would be the best to use module.

A few more things. If you look at datasheet, at page 3.
http://www.ti.com/lit/ds/symlink/pcf8575.pdf

Pins A0, A1 and A2 are for determinate I2C adress. It says you can connect them to Vcc or GND (picture on page 1 and 23 showing connection to GND).

Description of pins P00 to P16 is input/output - push/pull design structure.
What is meaning of push/pull?

Pull up - for get signal you connect pin to gnd?
Push down - for get signal you connect pin to Vcc?

Is this two correct?

Grumpy_Mike

#17
May 24, 2019, 06:41 pm Last Edit: May 24, 2019, 06:42 pm by Grumpy_Mike
When talking about inputs you pull up or pull down.

When talking about outputs you don't so much say push, as say to source or sink current.

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