SYSTEM MANAGEMENT PRODUCTS, SCREENCODER® FAMILY DESCRIPTION ScreenCode

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ScreenCoder® UR7HCTS2-U560 High-Performance 5-Wire Touch Screen Encoder Digitizer
SYSTEM MANAGEMENT PRODUCTS, SCREENCODER® FAMILY DESCRIPTION ScreenCoder® 5-wire UR7HCTS2-U560 first single that seamlessly interfaces 5-wire resistive touch screen USB-equipped system. also first touch screen controller market designed accommodate very wide range size, capacitance resistance 5-wire touch screens, providing universal performance solution among different products touch screen vendors. This unique feature provides OEMs with wide variety interchangeable touch screen options. ScreenCoder® integrates digitizer with controller that performs touch detection, noise filtering, error elimination provides host with processed stable positioning data over USB. Semtech's unique motion algorithms provide high resistance other noise sources resulting precise, non-jittery cursor control. Ideal application ScreenCoder® include portable devices, interactive kiosks industrial custom displays with integrated touch screens. universal features ScreenCoder® USB, implemented both system sensor interface, reduce development effort cost touch input based systems. ScreenCoder® available slim, 36-pin SSOP package. FEATURES Controller digitizer single Interfaces system Works with 5-wire resistive touch screen regardless size, material vendor Provides high resolution 1000 points axis, enabling make precise drawing signature captures Accurate, quick touch response Semtech's advanced sampling technology algorithms APPLICATIONS Handheld/notebook Portable devices ASSIGNMENTS Interactive kiosks Industrial/custom touch screens Highly resistant other noise digitizer external necessary Fully compliant with specifications; works with native drivers under Windows® Windows® Windows® 2000 Convenient applet calibration under Windows® included free Uses slim 36-pin, SSOP package PRELIMINARY
RSVD1 RSVD2 RSVD3 AD_NW AD_NE AD_SW AD_SE SENSE_DRV SENSE_AD RSVD4 RSVD5 VREF _RESET VSS2 OSCIN _OSCOUT
36-pin SSOP
D_RB TOUCH RSVD10 RSVD9 USBV RSVD8 RSVD7 RSVD6
Semtech ScreenCoder registered trademarks Semtech Corporation. other trademarks belong their respective companies. Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
ORDERING CODE
Package Options 36-pin plastic SSOP Pitch -20°C +85°C UR7HCTS2-U560-DR
Other Materials ScreenCoder® eval.
Type Evaluation
Order number EVK7-TS2-U560
BLOCK DIAGRAM UR7HCTS2-U560
Block Diagram ScreenCoder® 5-Wire UR7HCTS2-U560
Right Button
Power Management Section
Switch Interface
Power-On Reset Drive Lines
Touch Panel Interface
Sense Line
16-Bit Timer Sensor Interface
Oscillator Circuit
Communications Interface
OSCIN
_OSCOUT
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
FUNCTIONAL DESCRIPTION UR7HCTS2-U560 consists five major functional sections (see Functional Diagram Page These Sensor Interface, Power Management Section, 16-Bit Timer, Oscillator Circuit Interface.
DEFINITIONS
Mnemonic Power Reset Type Name Function
14,18
Power supply Ground
_Reset
Oscillators OSCI _OSCOUT USBV
Reset
OSCILLATOR This built-in oscillator circuit capable operations with external 6.00 clock source, ceramic resonator (preferably with built-in load capacitors) crystal with external load capacitors. FUNCTIONALITY ScreenCoder® 5-Wire UR7HCTS2-U560 low-speed device with remote wake-up capability. asks system send report requests every 10ms according specifications low-speed device. ScreenCoder® describes itself pointer, provides absolute position data system.
Oscillator input Oscillator output
line line reference voltage out: output pulling line with 1.5K external resistor
Touch Screen SENSE_DRV SENSE_AD TOUCH SE1, SE2, 19,32, AD_SE SW1, SW2, 20,31, AD_SW NE1, NE2, 21,30, AD_NE NW1, NW2, 22,29, AD_NW VREF Reserved RSVD1-10
Drive sense line sense line Touch detection Touch screen Southeast corner Touch screen Southwest corner Touch screen Northeast corner Touch screen Northwest corner Voltage reference converter Mouse right button
1-3,10-11, 23-25, 27-28
Reserved future
Note: underscore before mnemonic denotes active signal. Types Legend: I=Input; O=Output; I/O=Input Output; P=Power; Analog Input
POWER MANAGEMENT According specification, there activity port system considered suspended state. UR7HCTS2-U560, detecting that system suspend, checks state touch screen right button. there touch pressure burtton pressed, enters suspended state. suspended state, fully complies with specification power consumption, dissipating current only USB-mandated pull-up fordevice identification. Another technique uses conserve power remote wake-up. system relies device perform wake-up, sends resume message system when there activity touch screen button. system does allow remote wake-up, ScreenCoder® does send resume messages system when awakened activity touch screen button.
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
TOUCH SCREEN SENSOR INTERFACE UR7HCTS2-U560 acquire data from five-wire resistive touch screen sensor, regardless size, material vendor. sensor interface following features:
Touch detection
periodically checks touch pressure applied panel. there touch, does perform measurements does send data system. When touch pressure detected, further qualifies determines amount pressure. Semtech's proprietary, patent-pending touch detection algorithm performs this test very quickly, accommodating sensors with various plate-to-plate capacitances.
Touch measurement
Position information collected only touch pressure sufficient accurate reading. 5-wire touch screen panels. resistive panel supplying voltage gradient. other conductive panel used touch voltage. obtain position information from resistive touch screen sensor, UR7HCTS2-U560 uses four internal drivers (three pins each driver) sense line. During sampling, drivers X-axis activated setting X-drive high other X-drive low. sense plane floating. This action produces voltage gradient across touch screen's surface direction. internal measures both voltage across activated X-plane voltage potential between planes. Next, drivers Y-axis activated. Again, internal measures both voltage across activated plane potential between planes. absolute position obtained from these measurements.
Touch algorithm
vibration electrical noise, data used directly. Internal data processing delivers consistent position accuracy quick touch response.
Resolution
UR7HCTS2-U560 uses built-in converter touch position. maximum absolute position resolution 1000 points each axis. Resolution varies somewhat different touch screen sensors, voltage droop connecting wires sensor's mechanical construction.
Touch screens from different manufacturers
Operating parameters touch screens from different manufacturers vary depending sensor's size, material, mechanical construction. UR7HCTS2-U560 allows these differences adjusts automatically plate-to-plate capacitance, intrinsic plate resistances, etc. supports every kind 5-wire touch screen, regardless manufacturer materials.
Touch screen's coordinates
zero point touchscreen left upper corner. diagram.
(0,0)
Buttons
UR7HCTS2-U560 implements physical right mouse button.
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
SENSE RIGHT BUTTON MOSFET_N 4.7K RVSD1 TOUCH RVSD8 RVSD7 RVSD6 0.1µF 1.5K RVSD2 RVSD3 AD_NW AD_NE AD_SW AD_SE 10nF SENSE_DRV SENSE_AD RVSD5 VREF RESET VSS2 OSCIN OSCOUT USBV TC54VC4502ECB 6.00MHz 100nF RVSD4 RVSD9 10µF
CON5
SUGGESTED INTERFACING SCREENCODER® UR7HCTS2-U560-DR
UR7HCTS2-U560 -Pin
RVSD10
SMDAXXC-5
SHIELD
Mounting holes
www.semtech.com
MECHANICAL INFORMATION (36-PIN SSOP) PACKAGE
36-pin SSOP Plastic
Detail Dimension Millimeters 0.05 0.35 0.13 0.15 14.8 15.0 15.2 11.63 11.93 12.23 1.765 0.15
www.semtech.com
Recommended Mount Symbol
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings Ratings Supply voltage Input voltage Current drain (not including VDD) Operating temperature UR7HCTS2-U560 Storage temperature range (Human body model) Symbol TSTG VESD Value -0.3 TLOW THIGH +125 Unit
Electrical Characteristics, Temperature range TLOW THIGH unless otherwise noted) Characteristic Symbol Supply voltage Output voltage load) Input high voltage Input voltage Input current +/-10 Supply current (VDD=5.0 VDC+/-10%, VSS=0)
Unit
Control Timing (VDD=5.0 +/-10%, VDC, Temperature range TLOW THIGH unless otherwise noted) Characteristic Symbol Unit Frequency operation Crystal option fOSC External clock option fOSC
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
SCREENCODER® UR7HCTS2-U560 BILL MATERIALS
UR7HCTS2-U560-DR Description Quantity Capacitors: Connectors: ICs: Resistors: Resonator: Manufacturer Part# Description
Generic Generic Generic
10nF capacitor, better 10µF capacitor 100nF capacitor
Generic
connector
Semtech Semtech Microchip
SMDAxxC-5 UR7HCTS2-U560 TC54VC2702ECB
Bidirectional array protection ScreenCoder® volt low-power reset voltage detector
Generic Generic Generic
4.7K resistor resistor 1.5K resistor
Panasonic
EFO-S6004E5
6.00MHz ceramic resonator, with built-in load capacitorss
MOSFET: Button:
Generic
MOSFET-N
Generic
Push button
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
Page Left Blank Intentionally
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com
sales information product literature, contact: Semtech Corporation Human Interface Device (HID) System Management Division Flynn Road Camarillo, 93012-8790 sales@semtech.com http://www.semtech.com/ (805)498-2111 Telephone (805)498-3804
Copyright ©1999-2002 Semtech Corporation. rights reserved. Semtech ScreenCoder registered trademarks Semtech Corporation. other trademarks belong their respective companies. INTELLECTUAL PROPERTY DISCLAIMER This specification provided with warranties whatsoever including warranty merchantability, fitness particular purpose, warranty otherwise arising proposal, specification sample. license hereby granted reproduce distribute this specification internal only. other license, expressed implied other intellectual property rights granted intended hereby. Authors this specification disclaim liability, including liability infringement proprietary rights, relating implementation information this specification. Authors this specification also warrant represent that such implementation(s) will infringe such rights.
Copyright ©1999-2002 Semtech Corporation DOC7-TS2-U560-DS-104 2002-07
www.semtech.com

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