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Last Post 20 Aug 2008 03:05 PM by  nedkonz
How to connect to KEY_ROW2 using expansion breakout board?
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nedkonz
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20 Aug 2008 03:05 PM
    We've got an i.MX27 LITEKIT and we're prototyping a product that needs a 4x4 keypad.

    It's lucky that our keypad doesn't need to be any bigger, because the remaining row and column lines are being used for other purposes on the SOM.

    I've managed to track down how to connect to all but one of the KEY_ROW0-3 and KEY_COL0-3 signals, using the expansion breakout board to get to these signals.

    However, I can't figure out how to get to KEY_ROW2 using the expansion board. It doesn't seem to be available on the various breakout connectors on the expansion breakout board.

    Would it be possible to post a photo showing which via on the baseboard or expansion board that we could solder a wire to in order to use this signal? Or to describe another method?


    121 MFP (KEY_ROW2) I/O 1.8V Keypad Row 2 signal.
    MFP_D52
    J14/122


    Here's what I've figured out about the remaining keyboard signals:

    Quote:

    101 MFP (KEY_COL3) I/O 1.8V Keypad Column 3 signal.
    MFP_D65 (pg. 2, 10 baseboard book)
    J14/102
    J15/35
    103 MFP (KEY_COL2) I/O 1.8V Keypad Column 2 signal.
    MFP_D64
    J14/104
    J15/36
    105 MFP (KEY_COL1) I/O 1.8V Keypad Column 1 signal.
    MFP_D63
    J14/106
    J16/33
    107 MFP (KEY_COL0) I/O 1.8V Keypad Column 0 signal.
    MFP_D62
    J14/108
    J16/34
    119 MFP (KEY_ROW3) I/O 1.8V Keypad Row 3 signal.
    MFP_D56
    J14/120
    J15/31
    123 MFP (KEY_ROW1) I/O 1.8V Keypad Row 1 signal.
    MFP_D54
    J14/124
    J16/29
    125 MFP (KEY_ROW0) I/O 1.8V Keypad Row 0 signal.
    MFP_D53
    J14/126
    J16/30
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