SYSTEM MANAGEMENT PRODUCTS, MOUSECODERFAMILY DESCRIPTION ScreenCoderSP

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SYSTEM MANAGEMENT PRODUCTS, MOUSECODERFAMILY DESCRIPTION ScreenCoderSP

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ScreenCoderUR7HCTS2-S840 High-Performance, Power Touch Screen Controller/Digitizer
SYSTEM MANAGEMENT PRODUCTS, MOUSECODERFAMILY DESCRIPTION ScreenCoderSPI/Serial touch screen controller integrated digitizer designed specifically RISC-based systems, such wireless Internet appliances. small, single footprint interfaces system either Serial Peripheral Interface (SPI) Asynchronous Serial Interface. Unlike simple implementations, ScreenCoderSPI/Serial does require complicated software drivers processing burden placed CPU. IC's superior data processing sampling rate, ScreenCoderSPI/Serial ideal systems requiring handwriting recognition. Patented-power management techniques also implemented that only consumes current most time, even with external mouse connected. operates Volts. Features Semtech's motion algorithm include resistance other noise which provides smooth precise motion control. UR7HCTS2-S840 also works flawlessly with 8-wire touch screen, regardless size manufacturer. cost-effective solution requires external components, allowing simple real estate saving implementation. FEATURES Touch screen controller digitizer single, small footprint Interfaces system either Serial Peripheral Interface (SPI) Asynchronous Serial Interface Works with 8-wire resistive touch screen, regardless size, material vendor Provides high resolution 1000 points axis sampling rate 200Hz Accurate, quick touch response advanced sampling technology patented algorithms Zero-Poweroperation typically consumes less than Highly resistant other noise sources Uses sophisticated power management maximum power savings Offers external PS/2 port hot-plug connection external PS/2 pointing device Capable providing other features, such battery monitoring GPIO PS/2 interfaces available Available small 32-pin LQFP package
APPLICATIONS Wireless Internet Appliances Handheld (H/PCs) ASSIGNMENTS Phones Portable Systems
RSVD2 ISEL/SCLK SOUT _PWR_DOWN
RVSD1 XDAT XCLK
_RTS/_SS
LQFP
_OSCOUT OSCIN
VSS2 _RESET VREF _CTS/_ATN XPWRS
ScreenCoder, MouseCoder Self-Power Management trademark Semtech Corp. other trademarks belong their respective companies. Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com
ORDERING CODE
Package Options 32-pin, Plastic LQFP Pitch mm's TA=-20° +85° UR7HCTS2-S840-FG
Other Materials ScreenCoderSPI/Serial
Type Evaluation
Order number EVK7-TS2-S840-XXX
Note XXX= Denotes Revision number
BLOCK DIAGRAM
Left Button ASI/SPI
Right Button
ASI/SPI Communication port
Switch Interface Power Management Section
Drivers Touch Screen
Touch Panel Interface
Power-On Reset
Sense Line
Sensor Interface Timer
XCLK
8042 Emulation port Oscillator Circuit
XDAT
OSCIN
_OSCOUT
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com
DEFINITIONS
Mnemonic VSS2 OSCIN Type Name Function Power Supply Ground Ground Oscillator Input: external clock input side Ceramic Resonator with built-in Load Capacitors Oscillator Output: open external clock input other side Ceramic Resonator with built-in Load Capacitors Reset: apply provide orderly start-up External Mouse Clock: PS/2 clock signal from external mouse; keep open unused External Mouse Data: PS/2 data signal from external mouse; keep open unused Left Button: active Right Button: active Sensor's Excitation Driver: connect Right Sensor's Excitation Driver:connect Bottom Sensor's Excitation Driver:connect Sensor's Excitation Driver: connect Left Reference Voltage built-in Sense line: Left Sense line: Sense line: Bottom Sense line: Right Hardware Power Down: high unused External Mouse Power Sense: connect switched power plane external pointing device high external mouse port used; external mouse port unused Slave Select Ready Send: active low, host ready data Attention Clear Send: active low, request data transfer Data Output: Serial mode Interface Select Clock: Serial Data Output: mode Reserved: Keep open
_OSCOUT
_RESET XCLK XDAT XR1, YB1, YT1, XL1, VREF _PWR_DOWN XPWRS
(nd) (nd) (nd) (nd)
_SS/_RTS _ATN/_CTS SCLK/ISEL SOUT RSVD1-2
19,26
Note: underscore before mnemonic denotes active signal. Types Legend: AI=Analog Input; I=Input; O=Output; I/O=Input Output; (nd)=Input Output with N-channel Open Drain driver
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com
FUNCTIONAL DESCRIPTION UR7HCTS2-S840 consists functionally five major sections (see Functional Diagram). These Sensor Interface, Power Management section, 16-Bit Timer, Oscillator Circuit Serial Peripheral Interface (SPI) Asynchronous Serial Interface (Serial). sections communication with each other operate concurrently. OSCILLATOR This built-in Oscillator circuit capable operations with external 4.00 Clock source, Ceramic Resonator (preferably with built-in Load Capacitors). Note, that Crystals used. ScreenCoderSPI/Serial frequently switches Oscillator order operate with least amount power consumption. very high Crystal-based oscillators have exceedingly long Start-up time used with ScreenCoderSPI/Serial EXTERNAL PS/2 INTERFACE There external PS/2 port connection standard PS/2 devices, including Microsoft WheelMouse 5-Button Mouse. mouse motion data sent relative format. external PS/2 port also supports hotplug; users connect mouse system time without rebooting. POWER MANAGEMENT ScreenCoderSPI/Serial implements power management methods: Self-Power Managementand System-coordinated Power Management.
Self-Power ManagementSelf-Power Managementis method implemented that, independently system intervention, results lowest power consumption possible within present parameters operation. Through SelfPower ManagementTM, capable typically operating only 1uA, independently state Host system. Self-Power Managementprimarily determines actual power consumption When host active state, still operate most time only 1uA, even when active external PS/2 device attached Self-Power Managementoffers three modes operation: Stop, Wait. "Stop" mode lowest power consumption mode. this mode, oscillator stopped consumes only leakage current. This default mode which will revert when idle. "Wait" mode entered when waiting response continuation data stream from PS/2 device. duration wait mode limited 40ms, within which time will either receive data from PS/2 device enter "Stop" mode. Typical power consumption this mode several hundred uAs. "Run" mode entered briefly, only process event. will only remain this mode when there pending tasks, such PS/2 report reception initialization PS/2 device.
System Request Send, Mouse plug Data Packet, Touch Screen activity, Button press
Figure Self-Power ManagementState
STOP
inactivity
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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POWER MANAGEMENT (CON'T)
System-coordinated Power Management
Figure System-coordinated Power Management
Normal Operation State:
Critical Suspend
normal operation state, both _PWR_DOWN XPWRS pins high state. ScreenCoderSPI/Serial operations controlled Self-Power ManagementTM.
_PWR_DOWN=0
_PWR_DOWN=0
_PWR_DOWN=1 XPWRS=0
_PWR_DOWN=1 XPWRS=1
Critical Suspend:
time, Host negate _PWR_DOWN order force ScreenCoderSPI/Serial into "critical suspend" mode. This signal activated (driven low) specific conditions Host's operations (for example, discharged battery), actions Operating System BIOS. During "critical suspend", ScreenCoderSPI/Serial will shut down pointing activities.
Mouse power down _PWR_DOWN=1 XPWRS=0 Normal State
_PWR_DOWN=1 XPWRS=1
TOUCH SCREEN SENSOR INTERFACE ScreenCoderSPI/Serial acquire data from four- eight-wire resistive touch screen sensors. sensor interface following features:
Touch detection
periodically checks touch pressure applied panel. there touch, will perform measurements will 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.
External PS/2 power down:
ScreenCoderSPI/Serial monitors state power supply rail external PS/2 pointing device through XPWRS pin. senses that external PS/2 device been powereddown host, will actively eliminate shot-through current input buffers clock data lines driving both low. ScreenCoderSPI/Serial will reinitialize external PS/2 pointing device when power external PS/2 port restored.
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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TOUCH SCREEN SENSOR INTERFACE (CON'T)
Touch Measurement
Position information only collected been determined that touch pressure sufficient accurate reading. obtain position information from Resistive Touch Screen Sensor, ScreenCoderSPI/Serial uses four internal drivers (two pins each driver) four sense lines. During sampling, drivers X-axis activated setting X-drive high other X-drive low. drivers Y-axis 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 Yaxis activated while drivers X-axis floating. Again, internal measures both voltage across activated plane potential between planes. absolute position obtained from these four measurements. keeps measuring touch pressure even while positioning data acquired. insufficient touch pressure detected during sampling position, current data will rejected.
Touch algorithm
vibration electrical noise, data used directly. Internal data processing delivers consistent position accuracy quick touch response.
Resolution
ScreenCoderSPI/Serial uses built-in converter touch position. maximum absolute position resolution 1000 points direction. Resolution varies somewhat different touch screen sensors, voltage droop connecting wires sensor's mechanical construction.
Touch screen from different makers
Operating parameters touch screens from different manufacturers vary depending size sensor, material made from, mechanical construction. ScreenCoderSPI/Serial takes these properties into account, adjusts automatically plate-to-plate capacitance, intrinsic plate resistances, etc.
Touch-screen's coordinates
zero point touchscreen left upper corner. diagram right.
(0,0)
Buttons
ScreenCoderSPI/Serial implements left right buttons. buttons information combined with external mouse's buttons information when sent system. Typically, buttons used, they provided development aid.
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com
SERIAL PERIPHERAL INTERFACE (SPI) ASYNCHRONOUS SERIAL INTERFACE (SERIAL) ScreenCoderSPI/Serial supports either Serial Peripheral Interface (SPI) Asynchronous Serial Interface (Serial) communication based power-up setting ISEL/SCLK pin. select Asynchronous Serial Interface, connect ISCL/SCLK VSS. interface, SCLK must idle high. ABSOLUTE MODE PACKAGE FORMAT
Byte Mouse Absolute Number penup penup penup penup penup
RELATIVE MODE PACKAGE FORMAT
Data Packet Format ScreenCoderSPI/Serial
ScreenCoderSPI/Serial different types mouse packages. type absolute position data from touch screen sensor relative data from external PS/2 device. both Relative Absolute mode package format, each packet contains bytes. each byte used synchronization. first byte other bytes resolution absolute position bits (approximately 1000 points directions.) relative mouse data format supports operations with WheelMouse 5-button mice.
Byte
Mouse
Relative
Number Ysign Xsign
Note bits that marked with reserved future use. value given zero. Note data from external mouse bits. report, truncate bits. reduction based fact that increments seldom beyond range +127/-128. mouse data that exceeds this range, ScreenCoderSPI/Serial will give +127/-128.V8-V0: Revision (Current Revision here)
IDENTIFICATION REVISION REPORT PACKAGE FORMAT
Byte (See Note below) Number
Identification Revision ScreenCoderSPI/Serial
UR7HCTS2-S840 offers special identification revision package. This package uses absolute mode format, will appear normal absolute mode. normal absolute mode, first byte will Hex. This special 4-byte package identified first byte, Hex. This data package sent upon power-up.
Note C3-C0: Class F4-F0: Family P2-P0: Product Family V8-V0: Revision
UR7HC S840 (Current Revision here)
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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ASYNCHRONOUS SERIAL INTERFACE (ASI) MODE
Baud rate:
ScreenCoderSPI/Serial transmits data 19200 Baud, using recommended 4MHz oscillator.
Protocol:
Serial mode, ScreenCoderSPI/Serial supports transmission direction only Host). starts transmission system when mouse/keyboard package pending. data format start bit, data bits, parity stop bit. ScreenCoderSPI/Serial asserts _CTS indicate that packet transfer will start. Host asserts _RTS indicate that ready receive data. _RTS means that system receive data (e.g. UART operational). UR7HCTS2-S840 places data line when detects _RTS low. When package successfully transmitted, raises _CTS.
Notes Protocol:
assure fast transmission, system must assert _RTS soon possible. system ready receive data, doesn't have raise _RTS between packages. UR7HCTS2-S840 checks _RTS after every byte transmission. _RTS returns high, means that transmission unsuccessful. will raise _CTS abort transmission entire package will retransmitted. maximum time 10ms. system cannot assert _RTS after 10ms _CTS low, will raise _CTS abort transmission request. After that, ScreenCoderSPI/Serial will start transmission again.
_CTS
_RTS
Byte
Last Byte
Figure Serial Transmission Timing
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com
SERIAL PERIPHERAL INTERFACE (SPI) MODE Serial Peripheral Interface (SPI) synchronous bi-directional multi-slave protocol. mode, ScreenCoderSPI/Serial acts slave device. only supports transmission doesn't support receiving. data transfer performed maximum clock rate KHz. SDATA outputs data every time transfer clock changes from high level.
Protocol:
UR7HCTS2-S840 asserts _ATN indicate that mouse packet waiting transfer. Host asserts indicate that ready receive data. means system selected ScreenCoderSPI/Serial communication device. detecting low, enables interface places data data buffer. After short delay, system supplies eight clocks data from minimum time from first clock 50us. When byte transferred successfully, system wait minimum 50us begin clocks next byte transmission. When mouse package transmitted, system stops clock. needs communicate with other devices, wait _ATN return high. _ATN high means port UR7HCTS2-S840 high Impedance State.
_ATN
SCLK
SDATA
Byte
Byte
Last Byte
Figure Transmission Timing: (_SS toggles every package).
Notes Protocol:
assure fast transmission, system must assert soon possible, Figure system ready data, doesn't have raise between packages, Figure
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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PROTOCOLS UR7HCTS2-S840 MODE (CON'T)
Communication Timing Parameters
Symbol Description _ATN first clock (_SS toggles every package) _ATN first clock (_SS low) Last clock transmitted byte next byte's first clock Last byte finish _ATN high 5000 5000 5000 Units
_ATN
SCLK
SDATA
Byte
Byte
Last Byte
Figure Packet Transmission Timing: (_SS always).
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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RVSD1
RTS/SS
PWR_ON XPWRS CTS/ATN VREF RESET VSS2 4.00MHz OSCIN OSCOUT
PWR_DOWN
Interface
4.7K
.1uF 10uF
10nF +/-10% TC54VC4502ECB NOT_RESET
10nF +/-10%
SUGGESTED INTERFACING SCREENCODERSPI/SERIAL UR7HCTS2-S840-FG SERIAL MODE
www.semtech.com
EXT_POWER_SENSE
10nF +/-10%
EXT_PS2_VDD
NOTES:
Semtech Company CTS2-S840-FG Interface ument Number UR7HCTS2S820 0.60
S840 SCI/SPI Out, 4.00 MHz, 8/4- wire, Model Connect Drive Sense lines together 4-wire Sensor. 4.00 Ceramic Resonator with Built-in Load Capacitors. Crystals used.
10nF +/-10%
SHIEL
XDAT XCLK RSVD2 ISEL/SCLK SOUT
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
EXT_PS2_VDD 12uH EXT_M_DATA Note MDIN6_SH 47pF EXT_M_CLOCK RIGHT BUTTON
LEFT BUTTON
DRV_XL DRV_YT DRV_YB DRV_XR
SENSE_XL SENSE_YT SENSE_YB SENSE_XR
_RTS
R7HCTS2-S840 32-pin LQFP
47pF Mounti holes
_CTS
RVSD1
XDAT
XCLK
SENSE_XL SENSE_YT SENSE_YB SENSE_XR RSVD2 ISEL/SCLK SOUT PWR_DOWN XPWRS CTS/ATN VREF RESET VSS2 4.00MHz OSCIN OSCOUT
PWR_ON
4.7K
.1uF 10uF
10nF +/-10% TC54VC4502ECB NOT_RESET
10nF +/-10%
10nF +/-10%
EXT_POWER_SENSE
EXT_PS2_VDD
SUGGESTED INTERFACING SCREENCODERSPI/SERIAL UR7HCTS2-S840-FG MODE
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NOTES:
ems, Semtech Company 2-S840-FG Interface ment Number UR7HCTS2S840.sch 0.60
S840 SCI/SPI Out, 4.00 MHz, 8/4- wire, Model Connect Drive Sense lines together 4-wire Sensor. 4.00 Ceramic Resonator with Built-in Load Capacitors. Crystals used.
10nF +/-10%
SHIEL
RTS/SS
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
EXT_PS2_VDD 12uH EXT_M_DATA Note MDIN6_SH 47pF EXT_M_CLOCK RIGHT BUTTON 47pF Mounti holes
LEFT BUTTON
DRV_XL DRV_YT DRV_YB DRV_XR
_ATN
SCLK
SOUT
UR7HCTS2_S840 32-pin LQFP Interface
MECHANICAL INFORMATION PACKAGE
Symbol
Detail
Recommended Footprint
Dimension Millimeters 0.35 0.45 0.105 0.125 0.175
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings Ratings Supply Voltage Input Voltage Current Drain (not including Vdd) Operating Temperature UR7HCTS2-S840 Storage Temperature Range Symbol Tstg Value -0.3 -0.3 +0.3 high +125 Unit
Electrical Characteristics, Temperature range=T high unless otherwise noted) Characteristic Symbol Supply Voltage Output Voltage load) Vdd-0.1 Input High Voltage Input Voltage 0.2xVdd Input Current Supply Current (Vdd=5.0 Vdc+/-10%, Vss=0)
Unit
Control Timing (Vdd=5.0 +/-10%, Vss=0 Vdc, Temperature range=T high unless otherwise noted) Characteristic Symbol Unit Frequency Operation fosc Ceramic Resonator Option External Clock Option
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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SCREENCODERSPI/SERIAL BILL MATERIALS PAGE SCHEMATIC
UR7HCTS2-S840-FG Description Quantity Bare PCB: PCB1 Capacitor: C11-C14 Custom ICs: Inductor: Push Button: Left, Right Resistor Network: Resistor: Resonator: Manufacturer USAR Generic Generic Generic Generic Generic USAR USAR Analog Devices TelCom Generic Generic Part# PCB7-TS2-S840-060 UR7HCTS2-S840-FG UR6HCASI-S40T-FB ADM232LJR TC54VC4302EMB Description SPI/Serial Touchscreen 47pF, 10%, Ceramic, NPO, Size 1206 1uF, 16V, Tantalum Cap, SMT, Size 1206 10uF, 20V, Tantalum Cap, SMT, Size .1uF Ceramic Chip Cap, Z5U, SMT, 1206 .01uF, Ceramic Chip Cap, SMT, NPO, X7R, 1206 SPI/Serial ScreenCoderController Serial Test Chip Driver_Receiver Chip 4.3V, Volt Detector, THD, TO-83 12uH Inductor, SMT, 1210 (3225) Switch, 8mm, light touch,
Generic Generic Generic
744-083-472J PBRC-4.00BR
4.7K, Resistor, terminals, 4.7K Resistor, Thick Film, SMT, 1206 Resistor, Thick Film, SMT, 1206 Resistor, Thick Film, SMT, 1206 4.00MHz Resonator,
Note: Auxiliary components shown.
Revised 08/24/00
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com
sales information product literature, contact: System Mgmt Division Semtech Corporation Broadway York, 10012 usar@semtech.com http://www.semtech.com 2042 Telephone 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 (0)2380-769008 Telephone (0)2380-768612 Telefax Southern European Sales Office (0)1 69-28-22-00 Telephone (0)1 69-28-12-98 Telefax Central European Sales Office (0)8161 Telephone (0)8161 Telefax
Copyright 2000-2001 Semtech Corporation. rights reserved. MouseCoder, ScreenCoder Self-Power Management trademarks Semtech Corporation. Semtech registered trademark Semtech Company. 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 Semtech 2000-2001 DOC7-TS2-S840-DS-102
www.semtech.com

SYSTEM MANAGEMENT PRODUCTS, MOUSECODERFAMILY DESCRIPTION ScreenCoderSP

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