Nokia RM-57, Service Manual

Page: 362 / 391

Pin Signal I/O Engine connection Notes
15 GND GND
16 Col3 -> Helen3 Kbc_3
Keyboard interface electrical characteristics
Description Parameter Min Typ Max Unit Notes
High-level
input voltage
V
IH
0.65* V
DDS
V
DDS
0.3+ V
DDS
V Row
Low-level
input voltage
V
IL
-0.3 0 0.35* V
DDS
V Row
High-level
output
voltage
V
OH
1.62 V
DDS
1.98 V Column
Low-level
output
voltage
V
OL
0 0.45 V Column
(VDDS = 1.8V)
Display connector and interface connections
Figure 118 Display connector
Table 26 Display interface connections
Pin Signal I/O Engine connection Notes
1 GND
2
WRX
-> Helen3 Lcdwrx
Write Enable
(active low)
3 GND
4 D0 <-> Helen3 Lcdda0 Data
5 D1 <-> Helen3 Lcdda1 Data
RM-57/58
Nokia Customer Care System Module
Page 9–36 Company Confidential Issue 1
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