After Sales Technical Documentation
THX–4 Series Transceiver
Chapter 5
DISPLAY MODULE
Original, 09/94
THX–4
After Sales
Display Module
Technical Documentation
CHAPTER 5 – DISPLAY MODULE
CONTENTS
Page No
Introduction 5–3
Technical Specifications 5–3
External Connectors 5–3
Display Module Connector J2 5–3
Side Volume Connector J2 5–4
Functional Description 5–4
Circuit Description 5–4
General 5–4
Display Driver 5–4
Display Driver D1 Signals 5–5
Side Volume Connector 5–5
Supply Voltages and Power Consumption 5–5
List of Figures
Figure 1: LCD/Driver Circuit Diagram 5–7
Figure 2: LCD PCB Circuit Diagram 5–8
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After Sales
THX–4
Technical Documentation
Introduction
The Display Module controls the operation of the display and backlighting.
The Display Module is controlled by the System Module.
Technical Specifications
External Connectors
The Display Module is provided with 18 connections to the System
Module.
Display Module Connector J2
Pin Name Description
1 ROW1 Keyboard input line to system module
2 COL0 Keyboard output line from system module
Display Module
3 ROW0 Keyboard input line to system module
4 COL3 Keyboard output from system module
5 VBAT Supply voltage for lighting (+6V nominal)
6 LCD_LIGHTS Backlight on/off control from system module
7 LCD_CLOCK Clock signal to display module
8 LCD_RES Display driver reset signal from system module
9 XLCDEN Display driver chip select from system module
10 C_XD Display driver command/data line from system
module
11 SCL Display driver data clock from display module
12 VL2 +4.8V supply voltage to display module
13 XBUSY LCD driver busy signal to system module
14 0V Ground
15 SDA Display driver data line from system module
16 V_LCD Negative supply (nom. –3.5V) to display driver
17 EARP Not used
18 EARM Not used
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THX–4
After Sales
Display Module
Side Volume Connector J2
The side Volume Keys are connected to the main LCD flexi, J2.
Name Description
ROW0
COL2 Keyboard output line to system module
ROW1 Keyboard input line to system module
COL3 Keyboard output line to system module
Keyboard input line to system module
Functional Description
Circuit Description
General
The Display Module consists of one IC, a display and LED backlighting.
Technical Documentation
Display Driver
The Display Driver D1 is a programmable LCD controller driver, which is
able to drive the dot matrix LCD of up to 42 columns by 16–line
multiplexing. D1 contains a 5x7 dot matrix character generator.
Connection to the controller is via a serial link.
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After Sales
THX–4
Technical Documentation
Display Driver D1 Signals
Pin Name Description
D0/S1 SDA Serial data from radio module
D1/P/_S Parallel/serial selection
D2/CAE Chip address enable
D3/SO Serial Data out (not used)
SYNC Synchronous (grounded)
SCK Serial Clock Data clock for serial data
C/D C_XD Command/data input
CA0,CA1 Chip address
CS XLCDEN Chip select
RESET Reset signal input
CLOCK External clock input
Display Module
BUSY XBUSY Busy signal output
VLC1–5 LCD drive voltage supply
C0–41 LCD column outputs
R0–15 LCD row outputs
LCD backlighting is provided by LED’s V1, V2, V3 and V4. Constant
current is supplied by the System Module.
Side Volume Connector
The display module contains side volume and on/off keys. The keys are
connected to the System Module via the Display Module Connector J2.
The buttons enable the user to alter the volume level and the on/off switch
for the radio variants.
Supply Voltages and Power Consumption
The supply voltage for the display module is supplied from the radio
module via the VL2 line (J2/12) and is available with the phone switched
on or in the power–off charging mode.
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THX–4
After Sales
Display Module
The supply voltage for the backlighting LEDs is provided by the VBAT line
(J2/5) and is available when the battery is connected. Typical
current/voltage consumption values for the module are as follows:
Power Status I/VL2 I/VBAT
Power off 0 mA 0 mA
Power on without lighting 1.5 mA 0 mA
Power on with lighting 1.5 mA 40 mA
Pin Minimum Typical Maximum
VL2 +5 V
VBAT +5.25 V +6 V + 9 V
Pin Minimum Typical Maximum
VL2 1.1 mA 1.7 mA 1.8 mA
VBAT 40 mA
Technical Documentation
Original, 09/94Page 5–6
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