Keypad Switching & Scanning - LG KE770 Service Manual

3. TECHNICAL BRIEF
3.8. Keypad Switching & Scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 8 rows (outputs
from Port Control Logic) and 8 columns (inputs to PCL). The number of rows and columns depend on
settings of the PCL.
VOLUME AND CAMERA KEY
UP KP_OUT(2)
KP_IN(5)
DOWN KP_OUT(3)
CAMERA KP_OUT(5)
C548
NA
KEY PAD PART
KP_IN(1:5)
KP_OUT(0)
KP_OUT(1)
KP_OUT(2)
KP_OUT(3)
KP_OUT(5)
CN502
5
4
3
2
1
C549
NA
T500
R511 0
KP_IN(1)
EVL14K02200
VA507
T503
R512 0
KP_IN(2)
EVL14K02200
VA508
T506
R513 0
KP_IN(3)
EVL14K02200
STAR
VA509
0
R514
KP_IN(4)
EVL14K02200
VA510
LEFT
R515 0
EVL14K02200
VA511
R521 0
R522 0
R523 0
R524 0
R526 0
VA502
EVL14K02200
Figure 11 PCB part numeric key matrix
END KEY
END_KEY
T501 T502 CLR
T504 T505 MENU
T507 T508 BACK
T509 SHAP SEND
VA503 VA504 VA505
EVL14K02200 EVL14K02200 EVL14K02200
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VBAT
CN202
3
2
1
R225
NA
UP
DOWN
OK
RIGHT
VA506
EVL14K02200