Keyboard Interface Electrical Characteristics - Nokia N72 Service Manual

RM-180
System Module
Name of Connection
Earpiece
IHF speaker
UI connections
Pin
1 GND
2 LED+
3 Col2
4 LED-
5 Col1
6 GND
7 Row3
8 Row2
9 Row1
10 Row6
11 Row0
12 Col0
13 Row5
14 Row4
15 GND
16 Col3

Keyboard interface electrical characteristics

Description Parameter
High-level V
IH
input voltage
Low-level V
IL
input voltage
Issue 1
Table 26 User interface connections
Signal I/O
<-
->
->
->
->
->
->
->
->
->
->
->
->
Min
0.65* V
DDS
-0.3
COMPANY CONFIDENTIAL
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B2101
B2102
Engine connection
GND
N2301
D4800
R2305 + V2300
D4800
GND
D4800
D4800
D4800
D4800
D4800
D4800
D4800
D4800
GND
D4800
Typ Max
V 0.3+ V
DDS
0 0.35* V
Nokia Customer Care
Connector reference
VLEDOUT2
Kbc_2
SETCURR2
Kbc_1
Kbr_3
Kbr_2
Kbr_1
Kbr_6
Kbr_0
Kbc_0
Kbr_5
Kbr_4
Kbc_3
Unit
V
DDS
V
DDS
Notes
Discrete
Backlight SMPS
(controlled by
EM ASIC N2300)
Serial resistor +
Transistor
switch
(controlled by
EM ASIC N2300)
Voice switch
connection
Voice switch
connection
Notes
Row
Row
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