Microchip HSA2-0C0SIA/A2S24 Handleiding

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TSHARC-A2 Touch Screen Microcontroller
Application Guide
Ver. 2.0
3.3 – 5vDC 28 pin SOIC
12 – Bit Resolution
TTL, RS-232 and USB
Auto detect 4, 5, and 8 wire analog resistive touch screens
Microchip TSHARC products use standard silicon to produce a variety of touch screen controller chip
solutions. The chip part number and chip revision is laser marked on the top surface of the each
microcontroller.
It is important to make sure that adequate static precautions are taken when handling
any TSHARC touch screen controller chip.
Document Revision and Copyright
Document Name: 05B_TSHARC-A2_Chip_App_GuideVer2.0120418
Document Date: April 18, 2012
Copyright Microchip Technology Inc.
1995 – 2012 All rights reserved
TSHARC™ and UniWInDriver™ are the exclusive trademarks of
Microchip Technology Inc.
All Rights Reserved.
Contact Information
Microchip Technology Inc.
9055 N. 51st Street, Suite H
Brown Deer, WI 53223
www.microchip.com
Phone: 414-355-4675
Fax: 414-355-4775
2
Important Documents and User Information
Use this document as a guide only. The information contained in this document is subject to change without notice. This
document, and all of its contents, is protected under International and U.S. copyright law. Microchip Technology trademarks,
patents and copyrights are the exclusive property of Microchip Technology Inc. and may not be used without the express
written consent of Microchip Technology Inc.
Due to the vast range of application variables that fall outside of Microchip’s expertise and control, Microchip assumes no
responsibility for the usability or the suitability of Microchip products in customer application(s). Microchip assumes those
responsible for the application and use of Microchip Technology products and documentation have taken all necessary steps
to insure that the application of Microchip products meet any and all safety and performance requirements including any laws,
regulations, codes and standards associated with the application. In no case does Microchip warrant the usability or suitability
of its products in any medical, aviation, military or other life critical applications. User should contact Microchip Technology
before integrating any Microchip hardware or software product into these types of applications.
All Microchip standard software products, including but not limited to device driver software, are provided “as is” and may be
used exclusively with an authentic Microchip TSHARC touch screen controller. Microchip does not guarantee the usability of
any of its software products.
Microchip Technology warrants to the original purchaser that for the warranty period identified by Microchip warranty for the
specific product that you have purchased, that the goods will be in conformance with Microchip specifications. In addition to
Microchip specifications, the warrantee includes Non-Microchip specifications agreed-to, in writing, by Microchip in advance for
the limited purpose between the customer and Microchip Technology Inc. The warrantee also insures that the goods will be
free from defects in design and material for the warrantee period. Microchip Technology, at its option, will repair or replace the
nonconforming or defective goods, issue a credit memorandum, or refund the purchase price, as its sole obligation: provided
that the nonconforming or defective goods are rejected in writing (including a reasonable failure analysis statement) to
Microchip Technology and returned to Microchip Technology within the relevant warranty period and provided that the
nonconformance or defect was not caused by misuse, alteration, accident, or abnormal conditions of storage, operation or
handling, as determined by Microchip Technology.
THIS WARRANTY IS YOUR SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, FURTHER, MICROCHIP TECHNOLOGY INC SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGE OR LOSSES, INCLUDING LOSS OF PROFITS, BUSINESS
INTERRUPTION, OR OTHER PECUNIARY LOSS, WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON
CONTRACT, FUNDAMENTAL BREACH OR ANY OTHER THEORY. SINCE SOME JURISDICTIONS DO NOT ALLOW
LIMITATIONS OF THE TERMS OF ANY IMPLIED WARRANTY, OR EXCLUSION OR LIMITATION OF INCIDENTAL OF
CONSEQUENTIAL DAMAGES, THE LIMITATIONS AND EXCLUSIONS OF THIS WARRANTY MAY NOT APPLY TO YOU.
General Information
Mailing address World Wide Web Support E-Mail Address
Microchip Technology Inc.
9055 North 51st Street, Suite H
Brown Deer, WI 53223
Phone: 414-355-4675
Fax: 414-355-4775
www.microchip.com/tsharc
http://support.microchip.com
Copyright Information
This manual is ©1995-2009 Microchip Technology Inc. Reproduction of the contents of this copyrighted material in whole or in
part, by any means, mechanically or electronic, for any purpose, without the written permission of Microchip Technology Inc is
prohibited. Microchip Technology Inc., Microchip® TSHARC™, the TSHARC logo, and UniWinDriver™ are Trademarks of
Microchip Technology Inc. All Rights Reserved.
Edition Information
Printed on: April 18, 2012
Document Part number: 05B_TSHARC-A2_Chip_App_GuideVer2.0120418
3
Introduction
This manual has been written for users of the Microchip Technology Inc. TSHARC-A2 touch screen micro-
controller chip. The TSHARC touch screen controller chips and software described within this document are
assumed to be used with four, î‹Šve or eight wire analog resistive touch screen products manufactured by a variety
of touch screen manufacturers. Touch screens between manufacturers vary with regards to light transmission,
sensitivity, contact resistance, capacitance and other electrical characteristics. Because touch screen quality and
electrical characteristics may vary between touch screen technologies and manufacturers the actual, overall
performance may vary between touch screen overlay manufacturers’ products. While Microchip’s touch screen
controllers and drivers improve the performance of low quality or damaged touch screens, Microchip does not
guarantee the performance of or recommend the use of low quality touch screen overlay products in any touch
screen implementation.
A great deal of attention has been paid to eliminate potential problems with various touch screen manufacturers.
Microchip Technology has tested the TSHARC controllers with the following touch screen overlay manufacturers’
analog resistive touch screens. We have identiî‹Šed substantial specification variance within each manufacturer
and between manufacturers touch screens. While most of the manufactures we tested did fall within a functional
specification, it is important to request electrical and mechanical specifications from your touch screen overlay
manufacturer to insure uniform quality and performance. The specification details that should be provided by your
touch screen overlay supplier include lead to lead resistance, sheet resistance, and linearity of ITO.
Touch Screen Overview
4 and 8 wire touch screens are typically produced with higher resistance transparent conductive î‹Šlm (ITO Indium
Tin Oxide) than 5 wire touch screens. Most, touch screen resistance falls within 100 – 400 Ohm per square.
Because 4 and 8 wire touch screens typically have a highe sensors, you will find most r resistance than 5 wire
battery powered applications using this technology. You will also find that 4 and 8 wire touch screens are more
linear than 5 wire. The advantage of a 5 wire touch screen is that they are typically more mechanically durable
(top sheet does not need to be linear) and are less affected by environmental variation.
Five Wire touch screens come in a wide variety of sheet resistance. In some cases, because of the 5 wire
construction, the resistance may be lower than the 50 ohm specification. While these touch screens require more
power to drive them, this does not imply poor quality.
Once resistance drops below an optimum level so does the resolution. In contrast, as resistance increases,
depending upon the construction, contact resistance begins to negatively affect the touch screen’s performance.
The negative effect of a high or low resistance touch screen can be managed by properly implementing the
correct circuit. It should be understood that extremes in either direction will negatively influence the performance
of any efficient circuit design. In order to maximize efficiency and performance a higher resistance, linear,
environmentally stable touch screen is recommended.
The three paragraphs above barely scratch the surface of touch screen technology. Your product design
requirements will help you identify the touch screen technology and construction that will best suit your
application. Please contact Microchip Technology Inc. for more unbiased touch screen material science
information and a list of recommended TSHARC chip and circuit designs to fit your application.
Software and Device Drivers
All Microchip device drivers are designed specifically and exclusively to be used with Microchip TSHARC™ touch
screen controller products. Microchip drivers may be used to support 3rd party controller products only when
authorized specifically, in writing, by Microchip. Microchip Technology Inc. develops, supports and maintains all
products sold with the Microchip® or TSHARC™ trademark and does not use any third party technical resources
to develop any of its software, device drivers or hardware products. Drivers are available for Windows™ 9x, 2K,
ME, XP, XPe, NT™, DOS™, CE™, CE Net, Linux™, MAC and other operating systems and their variations.
Custom or private labeled drivers and firmware is available. Customized and private labeled software and
hardware licenses are available which may be used to enable various non-Microchip communication protocols,
special functions, application specific utilities or OEM contact information. Contact Microchip for details.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HSA2-0C0SIA/A2S24

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