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TCA8418E: TCA8418E key mapping

Terry Wu2
Expert 2110 points
Part Number: TCA8418E

Hello Sirs,

For this 80 Key scan IC . Is there problem pressed three keys at the same time ? Under Android O/S .

Is there any concern about key mapping as below ?

Appreciate your experience sharing !

  • 0
    TI__Guru 73761 points

    Hey Terry,

    It is possible to still see a ghosting event occur from this configuration. I would suggest using diodes on the switches to prevent this.

    This is an article that talks about using diodes:

    This is another one that also discusses this and even recommends a diode to use:

    Thanks,

    -Bobby