User Guide

NEM-2
System Module and User Interface CCS Technical Documentation
Page 14 Copyright Nokia. All rights reserved. Issue 1 07/03
LCD & Keyboard Illumination
For LCD illumination there are 3 white LEDs, which are integrated inside the LCD module.
For driving the LEDs a DC-DC converter is used .
The keypad is illuminated by 4 white LEDs driven also by the DC-DC converter.
UI B2B-Connector
Two UI B2B-connectors are used for connection between engine board and UI board.
UI B2B-Connector 1
No. Symbol Parameter Min. typ. max. Unit Note
1 VIO Supply for LCD 1.72 1.8 1.88 V LCDIF: VDDI (logic supply)
2 VFLASH1 Supply for LCD 2.70 2.78 2.86 V LCDIF: VDD (power supply)
3 GND 0 V
4 GND 0 V
5 LCDUI_0 LCD interface 0 1.8 V LCDIF: SCLK (CLOCK)
6 LCDUI_1 LCD interface 0 1.8 V LCDIF: SDA (SDATA)
7 LCDUI_2 LCD interface 0 1.8 V LCDIF: XCS (Chip select)
8 GENIO_4 LCD interface 0 1.8 V LCDIF: XRES (RESET)
9 GND 0 V
10 GND 0 V
11 LED+ DC-DC con-
verter out
9 10.8 12 V LCD illumination
Open circuit voltage: 20V max
12 LED- DC-DC con-
verter return
0.525 0.525 0.545 V LCD illumination,
Voltage over feedback resistor
13 LED1- Return 1 Return path 1 Keypad illumina-
tion
14 LED2- Return 2 Return path 2 Keypad illumina-
tion
15 Not used
16 Not used
17 GND 0 V
18 GND 0 V
19 GENIO_21 KB i/f 0 1.8 V KEY_BUS12, Column
20 GND V
21 GND V
22 GND V