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PCA9539PW Output issue

Question asked by Yashveer Ramparsad on Jan 18, 2018
Latest reply on Jan 23, 2018 by David Diaz Marin

Currently using the PCA 9539PW IO expander. Now I can communicate with it and tell it to output individual outputs (works perfectly). However problems arise when I wish to write to pins 7 and 11. What actually happens is that Pin 8 and 11 get set instead. Then when I set Pin 8 and 11(just to see what happens), Pin 7, 8 and 11 are all set! 

 

That seems to me like it is erroneous behavior. Like I mentioned before, I can set individual pins, problems arise when I wish to set 2 pins at a time!

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