LG GS290 - Keypad Switching & Scanning

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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
GS290 Operational Description Revision B
LG Electronics 42/136 LGE Property
3.8. Keypad Switching & Scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 3 rows (outputs from Port
Control Logic) and 2columns (inputs to PCL). The number of rows and columns depend on settings of the PCL.
Figure 10 Key pad part key matrix
VA407
EVLC5S0250
CN401
3
2
1
R425 680
VA412
R423 680
VA411
EVLC5S0250
VA413
CN403
3
2
1
KB402
KB400
DNI
VA404
R426
680
R424 680
R420
680
DNI
VA400
DNI
VA403
R419 680
R415
680
CN407
4
3
2
1
VA415
EVLC5S0250
KB401
VBAT
R414
680
R412
680
EVLC5S0250
VA416
EVLC5S0250
VA406
R427
680
KP_OUT[2]
KP_OUT[2]
KP_IN[5]
KP_IN[5]
KP_OUT[3]
KP_OUT[3]
KP_OUT[0]
KP_OUT[0]
KP_IN[3]
KP_IN[3]
END
END
SEND
CLR
VOL UP & DOWN
CAM HOLD
KEY PAD