LG LG9200 Service Manual page 21

3. Technical Brief
3.1.13 Keypad (1)
• KEYPAD Scanning Scheme (number -key).
The power key is connected to Calypso(DBB) directly using 'PWON'.
The other number-key and navigation-key is connected to Calypso(DBB) using:
- KBR (4:0) input pins for row lines
- KBC (4:0) output pins for column lines
PWON
S_KBR(1)
S_KBR(2)
S_KBR(3)
S_KBR(4)
S_KBR(0)
S_KBC(0)
S_KBC(1)
S_KBC(2)
S_KBC(3)
S_KBC(4)
POWER ON KEY
KB802 KB803 KB804 KB805
1 2 3
F3
KB806 KB807 KB808 KB809
4 5 6 F1
KB810 KB811 KB812 KB813
7 8 9 F2
KB814 KB815 KB816 KB817
* 0 # SEND
Keypad Scanning Scheme
- 22 -
KB801
KB823
F4
KB824
F5
UP
LEFT SW801
A D
COM1 COM4
OK
COM5 E
COM2 COM3
B C
DOWN
RIGHT