touchscreen_hardware_refman.pdf

hardwaredocumentation

SPItouchscreenproject

MarkusKammerstetter,

mne@tbmn.org

http://projects.tbmn.org

ViennaJune21,2006

CONTENTS CONTENTS

Contents

1projectPCBdescription 1

2powersupply 2

2.1schematic............................... 3

2.2layout................................. 4

2.3exposureprocess........................... 5

2.4etchingprocess............................ 7

2.5drilling................................. 8

2.6partlisting............................... 9

2.7readyPCB...............................10

3LCDcontroller 11

3.1schematic...............................11

3.2layout.................................13

3.3etchingprocess............................14

3.4partlisting...............................16

3.5readyPCB...............................17

4projectcontroller 18

4.1schematic...............................18

4.2layout.................................20

4.3etchingprocess............................21

4.4partlisting...............................22

4.5readyPCB...............................23

5LEDboard 24

5.1schematic...............................25

5.2layout.................................26

5.3partlisting...............................27

5.4readyPCB...............................28

CONTENTS CONTENTS

6LCDcontrastvoltagesupply 29

6.1schematic...............................30

6.2layout.................................31

6.3readyPCB...............................32

7problemsandpitfalls 33

Abstract

ThetouchscreenprojectbasicallyconsistsofacentralAtmelATMega128microcon-

trollerwhichinterfacesothercontrollerslikethetouchpadortheLCDcontroller.

ThismaincontrolleralsoactsasSPIslavedevicetoenablehighspeedcommunica-

tiononaSPIbus.

TheLCDmodulehasaninternalCCFTbacklightwhichispoweredbyahighvolt-

agepowersupply.

Additionallythedisplaymoduleneedsacontrastvoltagepowersupply.

ThetouchpadcontrolleraswellasthemainandtheLCDcontrollerarepoweredby

aseparatestabilizedpowersupply.

Thefollowingdocumentationdescribesallhardwaredesignsoftheproject.

1projectPCBdescription

Togiveabetterunderstandingoftheprojecthardware,westartoffwithPCBde-

scriptionpicture:

Figure1:requiredprojectPCBs

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