User Guide

CCS Technical Documentation System Module and User Interface

Company confidential RH-23

Issue 1 02/2004 Nokia Corporation. Page 29

• When LCD2 is illuminated GENIO(21) is set to ‘0’. ISET resistor determines the current.

• When LCD1 is illuminated GENIO(21) is set to ‘1’ (1.8V) and LED current is boosted.

Figure 13: LCD1 and LCD2 LED driver diagram

IR Module

The IR link supports speed from 9600 bit/s to 1.152 MBit/s up to distance of 80 cm.

Transmission over the IR is half-duplex. The length of the transmitted IR pulse depends

on the speed of the transmission. IR transceiver can be set into shutdown mode by set-

ting SD pin to logic ’1’ for current saving reasons. VBAT supplies transmitter LED, VIO

supplies I/O parts and VFLASH1 other parts of the transceiver. RX and TX data lines are

connected directly to UPP, not through UEM.

Figure 14: IR interface

Vibra

A vibra alerting device is used to generate a vibration signal for an incoming call. Vibra

connection is done with spring contacts via additional vibra lifting part PWB. Vibra inter-

LM2795

KLIGHT

270R

ISET

BRGT

GENIO(21)

GENIO(20)

33k

68k

VBAT

DLIGHT

VBAT

UEM

LCD1

LCD2

VBAT

KLIGHT

DLIGHT