Motorola APX 1000 - Figure 8-192.Keypad Lite Matrix Circuit

8-406 Schematics, Boards Overlays, and Parts Lists: Keypad Lite Board (84012559002)
Figure 8-192. Keypad Lite Matrix Circuit
(4,2) - H/L
(4,1) - SCAN
(4,0) - CALL
(COL,ROW)
SWITCH
SWITCH
SWITCH
S21
1
2
S20
1
2
S19
1
2
KP_ROW_2
KP_COL_4
KP_ROW_0
KP_ROW_1
KP_ROW_A
KP_COL_4
EMIF061005M12
KP_ROW_B
KP_ROW_2
FL1
1
2
3
4
5
6
10
11
12
7
8
9
P2001
28
P2001
26
O12
O11
GND
I1
O10
O9
O8
O7
I2
I3
I4
I5
I6
100PF
100PF
C27
C28
KP_ROW_C
KP_ROW_0
KP_COL_E
KP_ROW_1
G1
P2001
27
P2001
30
100PF
100PF
C22
C24
KEYPAD CONTROL
GROUND CONTACTS
M3
1
M2
1
M1
1