User Guide

CCS Technical Documentation System Module and User Interface
Company confidential NPL-3
Issue 1 3/03 ãNokia Corporation. Page 49
User interface modules
The NPL-3 UI module has a separate 4-layer UI PWB WK4.
The user interface features a 130 x130 pixel passive matrix color STN display, 4096
colours.
The LCD display is connected to transceiver PWB by 10-pin board-to-board connector.
Earpiece, microphone, IHF speaker and Vibra are connected using spring type connec-
tions. IR module and system connector are SMD devices. Keyboard (UI PWB) connects to
transceiver PWB through 16-pin spring type connector.
Figure 1 below describes the user interface connections.
Figure 23: BB UI Connections.
UI board WK4
WK4 includes contact pads for keypad domes and LEDs for keypad illumination. UI board
is connected to main PWB through 16-pin spring type board-to-board connector. Signals
of the connector are described in
External and internal signals and connections.
Keyboard
5x4 matrix keyboard is used in NPL-3. Key pressing is detected by scanning procedure.
Keypad signals are connected to UPP keyboard interface. Figure 2 shows keyboard matrix
in detail.
When no keys are pressed row inputs are in high state due to UPP internal pull-up resis-
tors. Columns are set as outputs and written low. When key is pressed one row is pulled
down and an interrupt is generated to MCU. After receiving interrupt MCU starts scan-
ning procedure. All columns are first written high and then one column at the time is
written low. All other columns except the one that was written low are set as inputs.
Baseband
LCD
Display
Earpiece
IR Link
Microphone
Keyboard
Pop-Port
System Connector
IHF
speaker
Vibra