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ScreenCoderTM UR7HCTS2-U860 High-Performance USB Touch Screen Controller / Digitizer
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODERTM FAMILY DESCRIPTION The ScreenCoder USB IC is the first single IC that seamlessly interfaces ANY 4- or 8-wire resistive touch screen to a USBequipped system. It is also the first touch screen controller IC on the market designed to accommodate a very wide range of size, capacitance and resistance of 4- or 8-wire touch screens, providing a universal performance solution among different OEM products and touch screen vendors. This unique feature of the IC provides OEMs with a wide variety of interchangeable touch screen options.
TM
FEATURES * Controller & digitizer in a single IC * Interfaces the system via USB * Works with ANY 4- or 8-wire resistive touch screen regardless of size, material or vendor * Provides high resolution - 1000 points per axis, enabling IC to make precise drawing and signature captures * Accurate, quick touch response due to Semtech's advanced sampling technology and algorithms APPLICATIONS * Handhelds/Notebooks * Portable Devices PIN ASSIGNMENTS * Interactive Kiosks * Industrial/Custom Touch Screens * Highly resistant to RF and other noise * No digitizer or external A/D necessary * Fully compliant with USB HID specifications; works with native USB drivers including Windows(R) 98, Me and 2000 * Convienent calibration applet offered free of charge * Uses slim 36-pin, SSOP package * Customized versions available
Unlike digitizers, the ScreenCoderTM USB integrates a digitizer with a controller that performs all touch detection, noise filtering, error elimination and provides the host with processed and stable positioning data over USB. Semtech's unique motion algorithms provide high resistance to RF and other noise sources resulting in precise, non-jittery cursor control. Ideal application for the ScreenCoderTM USB include portable devices, interactive kiosks and industrial / custom displays with integrated touch screens. The universal features of the ScreenCoderTM USB, as implemented in both the system and the sensor interface, reduce the development effort and cost of touch input based systems. The ScreenCoderTM USB is available in a slim, 36-pin SSOP package.
1 RSVD1 RSVD2 RSVD3 SXL SYT SYB SXR RSVD4 RSVD5 RSVD6 RSVD7 VREF _RESET VSS2 VDD OSCIN _OSCOUT VSS 18
36
36-pin SSOP
D+ D_RB RSVD13 XR2 YB2 YT2 XL2 RSVD12 RSVD11 USBV RSVD10 RSVD9 RSVD8 XL1 YT1 YB1 XR1
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ScreenCoder, MouseCoder are trademarks of Semtech Corp. All other trademarks belong to their respective companies.
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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ORDERING CODE
Package Options 36-pin, Plastic SSOP Pitch in mm's 0.8mm TA=-20 C to +85 C UR7HCTS2-U860-DR
Other Materials ScreenCoderTM USB Eval Kit
Type Evaluation Kit
Order number EVK7-TS2-U860-XXX
BLOCK DIAGRAM FOR THE UR7HCTS2-U860
Right Button
Power Management Section Switch Interface
Power -On Reset
Drivers for Touch Screen
Touch Panel Interface 4
Sense Lines
4 16-Bit Timer Sensor Interface
Oscillator Circuit USB Communication Interface
D+ D-
OSCIN
_OSCOUT
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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FUNCTIONAL DESCRIPTION The UR7HCTS2-U860 consists functionally of five major sections (see the Functional Diagram on Page 2). These are the Sensor Interface, the Power Management Section, the 16-Bit Timer, the Oscillator Circuit and the USB Interface. OSCILLATOR This IC has a built-in Oscillator circuit capable of operations with an external 6.00 MHz Clock source, or a Ceramic Resonator (preferably with built-in Load Capacitors) or a Crystal with external Load Capacitors. POWER MANAGEMENT According to the USB specification, if there is no activity of the USB port for 3 ms, the system is considered to be in a suspended state. The ScreenCoderTM USB IC, on detecting that the system is in suspend, will check the state of the touch screen and the right button. If there is no touch pressure detected or no button pressed, the ScreenCoderTM USB enters into the suspended state. In suspend the IC fully complies with the USB specification for the power consumption, dissipating current only in the USB-mandated pull-up for the device identification. Another technique the IC uses to conserve power is called remote wake-up. If the system relies on the device to perform wake-up, the IC will send a resume message to the system when there is activity on the touch screen or button.
PIN DEFINITIONS
Mnemonic Pin # Power: VDD 15 VSS 14,18 3.3V 22 _Reset 13 Oscillators: OSCI 16 OSCO 17 USB: D35 D+ 36 Touch Screen: XR1, XR2 19,32 YB1, YB2 31,20 YT1, YT2 21,30 XL1, XL2 22,29 SXR 7 SYB 6 SYT 5 SXL 4 VREF 12 SOUT 23 _RB 34 RDVD1-13 1-3,8-11 23-25, 27-28 33 Type P P P Name and Function Power Supply Ground USB Reference Voltage Out
I
I O I/O I/O
Reset
Oscillator Input Oscillator Output USB D- Line USB D+ Line
I/O I/O I/O I/O Al Al Al Al Al O I I/O
Touch Screen Right Drive Pins Touch Screen Bottom Drive Pins Touch Screen Top Drive Pins Touch Screen Left Drive Pins Touch Screen Sense Pin: for X Right Touch Screen Sense Pin: for Y Bottom Touch Screen Sense Pin: for Y Top Touch Screen Sense Pin: for X Left Voltage Reference for A/D Converter Output control data to A/D Converter Mouse Right Button Reserved for future use
Note: An underscore before a pin mnemonic denotes an active low signal. Pin Types Legend: I=Input; O=Output; I/O=Input or Output; P=Power; Al= Analog Input
POWER MANAGEMENT (CON'T) If the system does not allow remote wake-up, the ScreenCoderTM USB will not send resume messages to the system when it is awoken by activity on the touch screen or button.
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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TOUCH SCREEN SENSOR INTERFACE The ScreenCoderTM USB can acquire data from any 4- or 8-wire resistive touch screen sensors. The sensor interface has the following features:
Touch detection
The IC periodically checks touch pressure applied to the panel. If there is no touch, the IC will not perform measurements and will not send data to system. When touch pressure is detected, the IC further qualifies and determines the amount of 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 is only collected if it has been determined that the touch pressure is sufficient for an accurate reading. To obtain position information from the Resistive Touch Screen Sensor, the ScreenCoderTM USB uses four internal drivers (two pins for each driver) and four sense lines. During sampling, the drivers of the X-axis are activated by setting one X-drive high and the other X-drive low. The drivers for Y-axis are set floating. This action produces a voltage gradient across the touch screen's surface in the X direction. The internal A/D measures both the voltage across the activated X-plane and the voltage potential between the planes. Next, the drivers for the Yaxis are activated while the drivers for X-axis are set floating. Again, the internal A/D measures both voltage across the activated plane and potential between the planes. The X and Y absolute position is obtained from these four A/D measurements. The IC keeps measuring the touch pressure even while the positioning data is acquired. If insufficient touch pressure is detected during sampling of the position, the current data set will be rejected.
Touch algorithm
Due to vibration and electrical noise, the raw data can not be used directly. Internal data processing delivers consistent position accuracy and quick touch response.
Resolution
The ScreenCoderTM USB uses a built-in A/D converter to get the touch position. The maximum touch screen resolution is 1000 points per direction. Resolution varies somewhat for different touch screen sensors, due to voltage droop on connecting wires.
Touch screen from different makers
Operating parameters for the touch screens from different manufacturers vary depending on the size of the sensor, material it is made from, and mechanical construction. The ScreenCoderTM USB takes these properties into account, and adjusts automatically for plate-to-plate capacitance, intrinsic plate resistances, etc.
Buttons
The ScreenCoderTM USB implements both left and right buttons, however, there is no physical left button. Left button press is reported when there is touch pressure on the panel. The left button is released when there is no pressure on the panel. The right button is a physical button, and can be used individually.
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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USB FUNCTIONALITY The ScreenCoderTM USB is a lowspeed USB device with remote wake-up capability. The IC asks the system to send report requests every 10ms according to USB specification for low speed device. The ScreenCoderTM USB describes itself as a pointer, and provides absolute position data to the system.
USB DESCRIPTORS
Offset Part Size Value Description
Device Descriptor 0 bLength 1 bDescriptonType
1 1
0x12 0x01 0x0100 0x00 0x00 0x00 0x08 0x047A 0x0004 0x0061 0x04 0x0E 0x00 0x01
2
3 4 5 6 8 10 12 14 15 16 17
bcdUSB
bDeviceClass bDeviceSubClass bDeviceProtocol bMaxPacketSize0 idVendor idProduct bcdDevice iManufacture iProduct iSerialNumber bNum-
2
1 1 1 1 2 2 2 1 1 1 1
Numeric expression specifying the size of device descriptor Device descriptor type USB HID spec release number 01.00 Class code Sub class code Protocol code Maximum packet size for EP0 USAR's vendor ID USAR ScreenCoderTM USB Product ID Device release number Index of string descriptor describing manufacturer Index of string descriptor describing product Index of String descriptor describing serial number Number of possible configurations
Configuration Descriptor 0 bLength 1 1 bDescriptorType 1 2 wTotalLength 2 4 bNumInterface 1 5 6 7 8 bConfigurationValue1 iConfiguration 1 bmAttribute 1 MaxPower 1
0x09 0x02 0x0022 0x01 0x01 0x00 0xA0 0x32
Size of configuration descriptor in bytes Configuration (assigned by USB) Total length of data returned for this Number of interfaces supported by this configuration Current configuration value Configuration string descriptor index Configuration characteristics - bus powered, with remote wakeup Maximum power consumption of USB device 100 mA
Interface Descriptor 0 bLength 1 1 bDescriptorType 1 2 bInterfaceNumber 1 3 bAlternateSetting 1 4 bNumEndpoints 1 5 bInterfaceClass 1 6 bInterfaceSubClass 1 7 8 bInterfaceProtocol 1 iInterface 1
0x09 0x04 0x00 0x00 0x01 0x03 0x00 0x02 0x00
Size of Interface descriptor in bytes Interface descriptor type Number of interface Number of alternate setting Number of endpoint Class code (HID) Subclass code (nor boot interface subclass) Protocol code = mouse Index of string descriptor describing this interface
HID Descriptor 0 bLength 1 bDescriptorType 2 bcdHID 4 bCountryCode 5 bNumDescriptor 6 bDescriptorType 7 wDescriptorLength
1 1 2 1 1 1 2
0x09 0x21 0x0100 0x00 0x01 0x22 0x0038
Size of HID descriptor in byte HID descriptor type HID Spec release number Hardware target country Number of HID class descriptor follow Report descriptor type Total length of report descriptor
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USB DESCRIPTORS, (CON'T)
Offset Part Size Value Description
Endpoint Descriptor 0 bLength 1 bDescriptorType 2 bEndpointAddress 3 bmAttribute 4 WMaxPacketSize 6 BInterval String Descriptor 1 bLength 2 bDescriptorType 3 bString 5 bLength 6 bDescriptorType 7 bString
1 1 1 1 2 1
0x07 0x05 0x81 0x03 0x0005 0x0A
Size of endpoint descriptor in bytes Endpoint descriptor type Endpoint address (IN, Endpoint 1) Endpoint's attribute (interrupt) Maximum packet size Interval for polling (poll every 10 ms)
1 1 2 1 1 8
15 16 17
bLength bDescriptorType bString
1 1 20
0x04 0x03 0x0904 0x0A 0x03 `U',0,'S', 0,'A',0, 'R',0 0x3A 0x03 `S',0,'c' 0,'r',0, 'e',0,etc.
Length of string description in bytes Descriptor type = String LangID code = English Length of string descriptor Descriptor Type = String Manufacturer
Length of string descriptor Descriptor type = String "ScreenCoderTM UR7HCTS2-U860"
Offset Report 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 43 45 48 50 52 54 55
Data Descriptor 05 01 09 01 A1 01 09 01 A1 00 05 09 19 01 29 03 15 00 25 01 95 03 75 01 81 02 95 01 75 05 81 01 05 01 09 30 09, 31 15, 00 26, FF 7F 35, 00 46, FF 7F 75, 10 95, 02 81, 02 C0 C0
Mnemonic
Value
Usage Page Usage Collection Usage Collection Usage page Usage Minimum Usage Maximum Logical Minimum Logical Maximum Report Count Report Size Input Report Count Report Size Input Usage Page Usage Usage Logical Maximum Usage Maximum Physical Minimum Physical Maximum Report Size Report Count Input End Collection End Collection
Generic Desktop Pointer Application Pointer Physical Buttons 1 3 0 1 3 1 Variable 1 5 Constant Generic Desktop X Y 0 15 bits 7FFF 0 15 bits 7FFF 16 bits 2 Variable
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SW1
5
6
2
4
6
8
1
3
5
7
10nF +/-10% X7R RVSD5 RVSD6 RVSD7 VREF RESET VSS2 VDD OSCIN OSCOUT VSS RVSD10 RVSD9 RVSD8 XL1 YT1 YB1 XR1 USBV 26 25 24 23 RVSD12 2 U2 10 RVSD11 11 12 3 TC54VC4502ECB 13 14 15 Y1 16 C1 17 0.1uF 18 6.00MHz 27 1
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
RIGHT BUTTON GND XL YT YB XR VDD 1 RVSD1 RVSD2 RVSD3 SXL SYT SYB SXR RVSD4 28 XL2 29 YT2 30 YB2 31 XR2 32 RVSD13 33 R3 1.5K GND RB 34 D35 R2 30 D+ 2 3 4 5 6 7 VDD 8 9 36 R1 30 2 3 J1 1 4 C2 10uF
See Not es
DRV_XL DRV_YT DRV_YB DRV_XR
SENSE_XL SENSE_YT SENSE_YB SENSE_XR
SUGGESTED INTERFACING FOR THE SCREENCODERTM USB UR7HCTS2-U860-DR
7
UR7HCTS2-U860 36-pin SSOP
C7 GND 22 21 20 19 GND
RN1 4.7K
SHIEL D
C3
SXL
C4
SYT
10nF +/-10% X7R
C5
0.1uF
SYB
10nF +/-10% X7R
Mounting
holes
C6
SXR
10nF +/-10% X7R
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GND
NOTES:
(C)2000 USAR, A Semtech Company ScreenCoder(TM) USB UR7HCTS2-U860
U860 == USB Out, 6.00 MHz, 8/4-wire, Model0 Connect Drive and Sense lines together for the 4-wire sensor
Y1 == 6.00 MHz Ceramic Resonator withLoad Capacitors. n Built-i Crystals can NOT used. eb
MECHANICAL INFORMATION FOR DR (36-PIN SSOP) PACKAGE
36
19
HE
F
A A2 A1
E
1
18
D
L1
L
e
y
b
c
Recommended Mounting Pad Symbol e1 A A1 A2 b c D E e HE L L1 y b2 e1 I2 Dimension in Millimeters Min Nom Max - - 2.4 0.05 - - - 2.0 - 0.35 0.4 0.5 0.13 0.15 0.2 14.8 15.0 15.2 8.2 8.4 8.6 - 0.8 - 11.63 11.93 12.23 0.3 0.5 0.7 - 1.765 - - - 0.15 0 - 10 - 0.5 - - 11.43 - - 1.27 -
e b2
I2
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings Ratings Supply Voltage Input Voltage Current Drain per Pin (not including Vss or Vdd) Operating Temperature UR7HCTS2-U860 Storage Temperature Range Symbol Vdd Vin I Ta Tstg Value -0.3 to 7.0 Vss -0.3 to Vdd +0.3 20 T low to T high -20 to +85 -40 to +125 Unit V V mA C C C
DC Electrical Characteristics, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Supply Voltage 3.0 5.0 5.5 Output Voltage (10 A load) Voh Vdd-0.1 Vol 0.1 Input High Voltage Vih 0.8 x Vdd Vdd Input Low Voltage Vil Vss 0.2xVdd Input Current Iin +/- 10 Supply Current (Vdd=5.0 Vdc+/-10%, Vss=0) Idd 3.0 TBD
Unit V V V V A mA
Control Timing (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Unit Frequency of Operation fosc MHz Crystal Option 6.0 External Clock Option 6.0
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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SCREENCODERTM USB UR7HCTS2-U860 BILL OF MATERIALS
UR7HCTS2-U860-DR BOM Description Quantity Capacitors: C1, C7 2 C2 1 C3, C4, C5, C6 4 Connectors: J1 1 ICs: U1 1 U2 1 Resistors: R1, R2 2 R3 1 RN1 1 Resonator: Y1 1 Button: SW1 1 Manufacturer Generic Generic Generic Generic USAR TelCom Generic Generic Generic Panasonic Generic Part# Any Any Any Any UR7HCTS2-860 TC54VC2702ECB Any Any Any EFO-S6004E5 Any Description .1uF Capacitor 10uF Capacitor 0.01uF Capacitor, 10% X7R or better USB Connector ScreenCoderTM Controller Low-power Reset Voltage Detector 30 Ohms Resistor 1.5k Resistor 4x, 4.7k Resistor Network 6.00MHz Ceramic Resonator, w/ built-in Load Caps Push Button
Revised 10/03/00
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Page Left Blank Intentionally
Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101
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For sales information and product literature, contact: HID & System Mgmt Division Semtech Corporation 568 Broadway New York, NY 10012 hidinfo@semtech.com http://www.semtech.com 212 226 2042 Telephone 212 226 3215 Telefax
Semtech Western Regional Sales 805-498-2111 Telephone 805-498-3804 Telefax Semtech Central Regional Sales 972-437-0380 Telephone 972-437-0381 Telefax Semtech Eastern Regional Sales 203-964-1766 Telephone 203-964-1755 Telefax Semtech Asia-Pacific Sales Office +886-2-2748-3380 Telephone +886-2-2748-3390 Telefax Semtech Japan Sales Office +81-45-948-5925 Telephone +81-45-948-5930 Telefax Semtech Korea Sales Sales +82-2-527-4377 Telephone +82-2-527-4376 Telefax Northern European Sales Office +44 (0)2380-769008 Telephone +44 (0)2380-768612 Telefax Southern European Sales Office +33 (0)1 69-28-22-00 Telephone +33 (0)1 69-28-12-98 Telefax Central European Sales Office +49 (0)8161 140 123 Telephone +49 (0)8161 140 124 Telefax
Copyright 2000-2001 Semtech Corporation. All rights reserved. MouseCoder, ScreenCoder and Self-Power Management are trademarks of Semtech Corporation. Semtech is a registered trademark of Semtech Company. All other trademarks belong to their respective companies. INTELLECTUAL PROPERTY DISCLAIMER This specification is provided "as is" with no warranties whatsoever including any warranty of merchantability, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification or sample. A license is hereby granted to reproduce and distribute this specification for internal use only. No other license, expressed or implied to any other intellectual property rights is granted or intended hereby. Authors of this specification disclaim any liability, including liability for infringement of proprietary rights, relating to the implementation of information in this specification. Authors of this specification also do not warrant or represent that such implementation(s) will not infringe such rights.
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