LG Electronics LG-C320 service manual Technical Brief SUB System, Key Pad

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.

VREG_MSME_1V8

25pF

25pF

25pF

KEY_COL6 KEY_COL7

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