Hello,
I am using SN75LVDS82 and SN74LVDS83 as LCD and Keypad interface in my system. Recently i got a new proto boards build with these parts.
SN74LVDS83 is working good as expected, i can see the data displayed on LCD.
But SN75LVDS82 is not working as expected. Here, key pad serial data is connected to channel 4 (A3M & A3P) and output taken from output data line D11, D16, D17, D23 & D27.
When i press the key pad, i can't see the any response at D11 and D17 but other data lines are getting correct response. Actually i have compared the old board result with new board, old boards are working good and getting response on all the data lines when i press the key. When i say old and new board there is no difference on LVDS design, everything same. Layout revised for some other purposes.
i am wondering why few data lines are respond and others not?
Is anyone faced similar issues? Any recommendation to debug this issue?