LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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3.9. Hardware Peripheral system of Stn8810
3.9.1. Keypad
KS10 has 28 buttons, 12 function keys in Sub PCB (Folder), 12 numeric keys in main and 4 side keys.
KS10 use key coder IC because Stn8810 has not enough GPIO. Key coder IC use interrupt and I2C
interface for communication with STn8810. Figure shows the Keypad circuit.
°ÆEND’ Key is connected to PM_ON_SW_N to PM6650
Table. Key Matrix Mapping Table
Figure. Schematic of key coder IC
COL0
COL1
COL2
COL3
COL4
COL5
COL6
ROW0
1
2
3
Vol. UP
Left Soft Key
UP
Right Soft Key
ROW1
4
5
6
Vol. DOWN
MENU
OK
CANCEL
ROW2
7
8
9
SHOT
SEND
DOWN
END
ROW3
*
0
#
LEFT
EDIT
RIGHT
Main
Side Key
Folder
TP407
0.1u
C418
R415
3.3K
TP406
C419
0.1u
3.3K
R414
Wake_INP2
E7
D6
Wake_INP3
B6
Wake_INP4
Wake_INP5
A7
Wake_INP6
A6
B5
Wake_INP7
F3
_RESET
NC1
F5
G6
NC2
NC3
F6
G7
NC4
C2
NC5
NC6
C1
C6
NC7
NC8
B7
F1
PWM
SCL_AB
E6
F7
SDA_AB
VCC1
E1
VCC2
E2
G1
WD_Out
Wake_INP0
D7
C7
Wake_INP1
Gen_IO_0
D2
D1
Gen_IO_1
Gen_IO_2
B3
Gen_IO_3
A2
A1
Gen_In0
Gen_In1
B2
Int_Rx
G2
Int_Tx
F2
G3
K_Out0
K_Out1
F4
G4
K_Out2
K_Out3
G5
K_Out4
A5
B4
K_Out5
K_Out6
A4
A3
K_Out7
LM8333GGR8_NOPB
U404
B1
CLK_In
GND1
C3
C4
GND2
C5
GND3
GND4
D3
D4
GND5
GND6
D5
GND7
E3
E4
GND8
GND9
E5
AP_VDD_IO_2.7V
AP_VDD_IO_2.7V
68K
R419
FOLDER_DETECT
I2CSCL1
I2CSDA1
KEY_COL(5)
KEY_COL(6)
KEY_COL(7)
KEY_COL(4:7)
KEYCODER_RSTN
KEYCODER_INT
KEY_ROW(0:3)
KEY_ROW(2)
KEY_ROW(3)
KEY_ROW(0)
KEY_ROW(1)
KEY_COL(3)
KEY_COL(2)
KEY_COL(3:0)
KEY_COL(1)
KEY_COL(4)
KEY_COL(0)
Содержание KS10
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