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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
3.3 SUB SYSTEM
3.3.1 KEY PAD
C320 have a key-coder IC that supports eight sense lines, or columns, and eight keypad rows.
The device scans and encodes 64 matrix – addressed keys on keypads . Key press and release events are stored
in a FIFO buffer with 16 event lengths for uploading to a host processor. The event data stored will indicate the
sequence of events and which keys set pressed or released.
25pF
25pF
25pF
VREG_MSME_1V8
KEY_COL7
KEY_COL6