User Guide

PAMS Technical Documentation 5. UI Module

NSD-5

Issue 1 05/02 Nokia Corporation Page 5

UI Module

Introduction

The UI module LU3 is a two-layer PWB, which is connected to the system/Main PWB

with a 14-pin spring connector.

Functional Description

Power Distribution Diagram

Keyboard Matrix

NC = Not connected

Power Key

A micro switch is used as a power key on the UI module. The circuitry includes a micro

switch and two diodes, which are needed for the MAD interface. The power key, con-

nected to ROW4, is connected to CCONT and is active in Low state. The power key circuit

is visible in the Display Circuit diagram.

Keyboard

Keyboard backlighting is provided by six LEDs that are compatible with CL191-B1. Back-

lighting is on when the Light signal is on the High state. The LED color for the keyboard is

blue.

ROW/COL 0 1 2 3 4

0 NC Side Key Send End/Mode Side Key

1 NC Soft left Up Down Soft Right

2NC147*

3NC2580

4PWR

switch

369#

Line

symbol

Parameter Minimum

Typical/

Nominal

Maximum Unit Notes

2VBATBattery

voltage

3.2

3.6

4.2