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screencoder tm UR7HCTS2-S840 spi/serial interface, low-power touch screen controller/digitizer screencoder, mousecoder and self-power management are trademarks of semtech corpoation. all other trademarks belong to their respective companies. copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 1 hid & system management products, mousecoder tm family description features 1 9 16 8 25 32 24 17 lqfp syt sxl _pwr_down sout isel/sclk txd rsvd2 _rb oscin _oscout vss xr1 yb1 yt1 xl1 _rts/_ss sxr xpwrs _cts/_atn vref _reset vss2 vdd xclk xdat rvsd1 xl2 yt2 yb2 xr2 _lb syb the screencoder tm spi/serial UR7HCTS2-S840 is a touch screen controller and integrated digitizer ic designed specifically for risc- based systems, such as wireless internet appliances. the small, single footprint ic interfaces the system via either the serial peripheral interface (spi) or asynchronous serial. unlike simple a/d implementations, the screencoder tm spi/serial does not require complicated software drivers and no processing burden is placed on the cpu. due to the ic?s superior data processing and sampling rate, the screencoder tm spi/serial is ideal for use in systems requiring handwriting recognition. patented power management techniques are also implemented so that the ic only consumes 1 a of current most of the time, even with the external mouse connected. the ic operates at 3 to 5 volts. features of semtech?s motion algorithm include resistance to rf and other noise which provides smooth and precise motion control. the screencoder tm spi/serial also works flawlessly with any 4-wire or 8-wire touch screen, regardless of size or manufacturer. the cost-effective solution requires few external components, allowing for a simple and real estate saving implementation. exrtremely low-power operation ? ic typically consumes less than 1 a highly resistant to rf and other noise sources uses sophisticated power management for maximum power savings offers external ps/2 port for the hot-plug connection of an external ps/2 pointing device capable of providing other features, such as battery monitoring and gpio ps/2 and usb interfaces available available in tiny 7mm x 7mm 32-pin lqfp package touch screen controller / digitizer in a single, small footprint ic interfaces the system via either serial peripheral interface (spi) or asynchronous serial works with any 4-wire or 8-wire resistive touch screen, regardless of size, material or vendor provides high resolution of 1000 points per axis and a sampling rate of 200hz accurate, quick touch response due to advanced sampling technology and patented algorithms wireless internet appliances handheld pcs (h/pcs) web phones portable systems applications pin assignments
block diagram ordering code copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 2 package options pitch in mm?s ta=-20 c to +85 c 32-pin, plastic lqfp 0.8 UR7HCTS2-S840-fg other materials type order number screencoder tm spi/serial evaluation kit evk7-ts2-s840-xxx note : xxx= denotes revision number asi/spi communication port power management section power-on reset 16 bit timer oscillator circuit sensor interface switch interface touch panel interface 8042 emulation port asi/spi oscin _oscout left button right button drivers for touch screen sense line 4 4 xclk xdat
pin definitions copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 3 mnemonic pin # type name and function vdd 8 p power supply vss 11 p ground vss2 7 p ground oscin 9 i oscillator input: external clock input or one side of the ceramic resonator with built-in load capacitors _oscout 10 o oscillator output: open for external clock input or other side of the ceramic resonator with built-in load capacitors _reset 6 i reset: apply 0v to provide orderly start-up xclk 17 i/o (nd) external mouse clock: ps/2 clock signal from external mouse; keep open if unused xdat 18 i/o (nd) external mouse data: ps/2 data signal from external mouse; keep open if unused _lb 24 i/o (nd) left button: active low _rb 25 i/o (nd) right button: active low xr1, xr2 12, 23 i/o sensor?s excitation driver: connect to x right yb1, yb2 13, 22 i/o sensor?s excitation driver: connect toy bottom yt1, yt1 14, 21 i/o sensor?s excitation driver: connect to y top xl1, xl2 15, 20 i/o sensor?s excitation driver: connect to x left vref 5 ai reference voltage for built-in a/d sxl 31 ai sense line: for x left syt 32 ai sense line: for y top syb 1 ai sense line: for y bottom sxr 2 ai sense line: for x right _pwr_down 30 i hardware power down: tie high if unused xpwrs 3 ai external mouse power sense: connect to switched power plane for the external pointing device or tie high if external mouse port is used; tie low if external mouse port is unused _ss/_rts 16 i slave select / ready to send: active low, host ready to get data _atn/_cts 4 o attention / clear to send: active low, request data transfer txd 27 o data output: asynchronous serial mode sclk/isel 28 i interface select / spi clock : tie low for serial sout 29 i/o data output: spi mode rsvd1-2 19,26 i/o reserved: keep open note: an underscore before a pin mnemonic denotes an active low signal. pin types legend: ai=analog input; i=input; o=output; i/o=input or output; i/o (nd)=input or output with n-channel open drain driver
functional description copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 4 the screencoder tm spi/serial consists functionally of five major sections (see the functional diagram). these are the sensor interface, power management section, the 16-bit timer, the oscillator circuit and the serial peripheral interface (spi) and the asynchronous serial interface (asi). all sections communication with each other and operate concurrently. the screencoder tm spi/serial has a built-in oscillator circuit capable of operations with an external 4.00 mhz clock source, or a ceramic resonator (preferably with built-in load capacitors). note, that crystals can not be used. the screencoder tm spi/serial frequently switches its oscillator off and on in order to operate with the least amount of power consumption. due to very high q, the crystal-based oscillators have exceedingly long start-up time and can not be used with the screencoder tm spi/serial . run stop system request to send, mouse hot plug or data packet, touch screen activity, button press 1s of inactivity figure 1: self-power management tm state oscillator external ps/2 interface there is one external ps/2 port for the connection of standard ps/2 devices, including a microsoft wheelmouse or 5-button mouse. the mouse motion data is sent out in relative format. the external ps/2 port also supports hot- plug; users can connect the mouse to the system at any time without rebooting. power management the screencoder tm spi/serial implements two power management methods: self-power management tm and system-coordinated power management. self-power management tm self-power management tm is a method implemented by the ic that, independently of any system intervention, results in the lowest power consumption possible within the present parameters of its operation. through self- power management tm , the ic is capable of typically operating at only 1 a, independently of the state of the host system. self-power management tm primarily determines the actual power consumption of the ic. when the host is in the active state, the ic can still operate most of the time at only 1 a, even when an active external ps/2 device is attached to it. self-power management tm offers three modes of operation: stop, run and wait. "stop" mode is the lowest power consumption mode. in this mode, the oscillator is stopped and the ic consumes only the leakage current. this is the default mode to which the ic will revert when it is idle. ?wait? mode is entered when the ic is waiting for a response or continuation of data stream from the ps/2 device. the duration of wait mode is limited to 40ms, within which time the ic will either receive new data from the ps/2 device or enter ?stop? mode. typical power consumption in this mode is several hundred as. ?run? mode is entered briefly, only to process an event. the ic will only remain in this mode when there are pending tasks, such as ps/2 report reception or initialization of the ps/2 device.
power management (cont?d) copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 5 critical suspend ext mouse power down normal state _pwr_down=0 _pwr_down=1 and xpwrs=1 _pwr_down=0 _pwr_down=1 and xpwrs=1 _pwr_down=1 and xpwrs=0 _pwr_down=1 and xpwrs=0 figure 2: system-coordinated power management system-coordinated power management normal operation state: in normal operation state, both the _pwr_down and xpwrs pins are in high state. the screencoder tm spi/serial operations are controlled by self-power management tm . critical suspend: at any time, the host may negate the _pwr_down pin in order to force the screencoder tm spi/serial into a "critical suspend" mode. this signal can be activated (driven low) due to specific conditions of the host's operations (for example, a discharged battery), or due to actions of the operating system or bios. during the "critical suspend", the screencoder tm spi/serial will shut down all of the pointing activities. external ps/2 power down: the screencoder tm spi/serial monitors the state of the power supply rail for the external ps/2 pointing device through the xpwrs pin. if the ic senses that the external ps/2 device has been powered-down by the host, it will actively eliminate shot-through current in the input buffers for the clock and data lines by driving both low. the screencoder tm spi/serial will re- initialize the external ps/2 pointing device when the power to the external ps/2 port is restored. the screencoder tm spi/serial can acquire data from any four- or eight-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 screen sensor interface
touch screen sensor interface (cont?d) copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 6 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 screencoder tm spi/serial 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 y- axis 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 screencoder tm spi/serial uses a built-in a/d converter to get the touch position. the maximum absolute position resolution is 1000 points per direction. resolution varies somewhat for different touch screen sensors, due to voltage droop on connecting wires and sensor?s mechanical construction. 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 screencoder tm spi/serial takes these properties into account, and adjusts automatically for plate-to-plate capacitance, intrinsic plate resistances, etc. touch-screen's coordinates the zero point for the touchscreen is at the left upper corner. see the diagram to the right. buttons the screencoder tm spi/serial implements left and right buttons. the buttons information is combined with external mouse's buttons information when it is sent to the system. typically, the buttons are not used, they are provided as a development aid. x y (0,0)
serial peripheral interface (spi) and asynchronous serial interface (serial) copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 7 the screencoder tm spi/serial supports either serial peripheral interface (spi) or asynchronous serial interface (serial) communication based on the power-up setting of the isel/sclk pin. to select the asynchronous serial interface, connect iscl/sclk to vss. for spi interface, sclk must idle high. data packet format for screencoder tm spi/serial the screencoder tm spi/serial has two different types of mouse packets. one type is for absolute position data from the touch screen sensor and one is for relative data from the external ps/2 device. for both the relative and absolute mode packet format, each packet contains 4 bytes. the 7th bit of each byte is used for synchronization. the 7th bit for the first byte is 1 and for the other bytes is 0. the resolution for absolute position is 10 bits (approximately 1000 points in x and y directions.) the relative mouse data format supports operations with wheelmouse and 5-button mice. identification and revision for screencoder tm spi/serial the screencoder tm spi/serial offers a special identification and revision packet. this packet uses the absolute mode format, but will not appear in the normal absolute mode. for normal absolute mode, the first byte will be 0x80 or 0x9f hex. this special 4-byte packet is identified by the first byte, 0x81 hex. this data packet is sent upon power-up. bit number byte # 76543210 1 10000000 mouse absolute 1 penup 1 penup 1 penup 1 penup 1 penup 2 0 y9y8y7x* x9x8x7 3 0 x6x5x4x3x2x1x0 4 0 y6y5y4y3y2y1y0 absolute mode packet format bit number byte # 76543210 1 1 0 1 ysign xsign m r l mouse relative 2 0 x6x5x4x3x2x1x0 3 0 y6y5y4y3y2y1y0 4 0 x* b5b4z3z2z1z0 note 1: the bits that are marked with x* are reserved for future use. now the value given is zero. note 2: the x / y data from external mouse is 9 bits. in our report, we truncate it to 8 bits. the reduction is based on the fact that x / y increments are seldom beyond the range of +127/-128. for mouse data that exceeds this range, the screencoder tm spi/serial will give +127/-128. relative mode packet format bit number byte # 76543210 1 10000001 2 0 f4v8v7c3c2c1c0 3 0 p2p1p0f3f2f1f0 4 0 v6v5v4v3v2v1v0 (see note 3 below) note 3: c3-c0: class id hex 7 ur7hc f4-f0: family id hex a ts2 p2-p0: sub product family hex 1 s840 v8-v0: revision hex 40 (current revision here) identification and revision report packet format
asynchronous serial interface mode copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 8 baud rate: the screencoder tm spi/serial transmits data at 19200 baud, using the recommended 4 mhz oscillator. protocol: in serial mode, the screencoder tm spi/serial supports transmission in one direction only (ic to host). the ic starts the transmission to the system when it has a mouse packet pending. the data format is one start bit, 8 data bits, no parity and one stop bit. 1. the screencoder tm spi/serial asserts _cts low to indicate that a packet transfer will start. 2. the host asserts _rts low to indicate that it is ready to receive data. _rts low means that system can receive data (e.g. uart is operational). 3. the screencoder tm spi/serial places data on txd line when it detects the _rts low. 4. when one packet is successfully transmitted, the ic raises _cts. notes on the protocol: to assure fast transmission, the system must assert _rts low as soon as possible. if the system is ready to receive the data, it doesn't have to raise _rts between packages. the screencoder tm spi/serial checks _rts after every byte transmission. if _rts returns to high, it means that the transmission was unsuccessful. the ic raises _cts to abort the transmission, and the entire package is re- transmitted. the maximum time of t1 is 10ms. if the system cannot assert _rts low after 10ms of _cts low, the ic raises _cts to abort the transmission request. then the screencoder tm spi/serial tries to start the transmission again. 1st byte last byte t1 _cts txd _rts figure 3: serial transmission timing
serial peripheral interface (spi) mode copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 9 the serial peripheral interface (spi) is a synchronous bi-directional multi-slave protocol. in spi mode, the screencoder tm spi/serial acts as a slave device. the ic supports only transmission and doesn't support receiving. spi data transfer can be performed at a maximum clock rate of 500 khz. the sdata pin outputs data every time the transfer clock changes from high to low level. protocol: 1. the screencoder tm spi/serial asserts _atn low to indicate that a mouse packet is waiting for transfer. 2. the host asserts _ss low to indicate that it is ready to receive data. _ss low means the system selected the screencoder tm spi/serial for communication. 3. on detecting _ss low, the ic enables the spi interface and places data in the spi data tx buffer. after a short delay, the system supplies eight clocks to get the data from the ic. the minimum time t2 from _ss low to first spi clock is 50s. 4. when a byte is transferred successfully, the system has to wait a minimum of 50s to begin the clocks for next byte transmission. 5. when the mouse packet has been transmitted, the system stops the spi clock. if it needs to communicate with other spi devices, it has to wait for _atn return to high. _atn high means the spi port of the screencoder tm spi/serial is now in high impedance state. figure 4: spi transmission timing: (_ss toggles for every package). notes on the protocol: to assure the fast transmission, system must assert _ss low as soon as possible, see figure 4. if the system is ready to get data, it doesn't have to raise _ss between packets, see figure 5. _atn _ss s data 1st byte last byte t1 t2 sclk 2nd byte t3 t4
protocols for the screencoder tm spi/serial in spi mode (cont?d) copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 10 spi communication timing parameters symbol description min max units t1 _atn low to _ss low 10 ms t2 _ss low to first clock 50 5000 s (_ss toggles for every package) t2? _atn low to first clock 50 5000 s (_ss low) t3 last clock of transmitted 50 5000 s byte to next byte?s first clock t4 last byte tx finish to 30 s _atn to high _atn _ss s data 1st byte last byte sclk 2nd byte t3 t4 t2 figure 5: spi packet transmission timing: (_ss always low).
suggested interfacing for the screencoder tm spi/serial in asynchronous serial mode copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 11 mounti ng holes see note s notes: connect drive and sense lines together for the 4-w ire sensor. y1 == 4.00 mhz ceramic resonator with built-i n load capacitors. s840 == sci/spi out, 4.00 mhz, 8/4- w ire, model 0. crystals can not be used. screencoder ii ur7hc ts2-s840-fg sci interface (c)2000 usar syste ms, a sem tech company document n umber ur7hcts2s820 rev 0.60 vm ext_m_data ext_m_clock xr sxl syt not_reset syb sxr ext_ps2_vdd ext_power_sense shie ld xl yt yb vdd vdd ext_ps2_vdd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd c7 47pf c6 10nf +/-10% x7r c8 47pf c1 .1uf c3 10nf +/-10% x7r y1 4.00mhz rn1 4.7k 1 3 5 7 8 6 4 2 sw1 left button c4 10nf +/-10% x7r jp1 mdin6_sh 6 4 2 5 3 1 7 8 l1 12uh c2 10uf c5 10nf +/-10% x7r sw2 right button u1 u r7hcts2-s840 32-pin lqfp asi interface 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 syb sxr xpwrs cts/atn vref reset vss2 vdd oscin oscout vss xr1 yb1 yt1 xl1 rts/ss xclk xdat rvsd1 xl2 yt2 yb2 xr2 lb rb rsvd2 txd isel/sclk sout pwr_down sxl syt u2 tc54vc4502ecb 1 2 3 drv_xl drv_yb drv_yt drv_xr sense_xl sense_yb sense_yt sense_xr pwr_on _rts _cts txd
suggested interfacing for the screencoder tm spi/serial in spi mode copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 12 see note s holes mounti ng y1 == 4.00 mhz ceramic resonator with built-in load capacitors. notes: connect drive and sense lines together for the 4-w ire sensor. crystals can not be used. s840 == sci/spi out, 4.00 mhz, 8/4- w ire, model 0. screencoder ii ur7hcts 2-s840-fg spi interface (c)2000 usar systems, a semtech company docum ent number ur7hcts2s840.sch rev 0.60 xr ext_ps2_vdd ext_power_sense ext_m_clock xl sxl not_reset shie ld yb syb syt yt ext_m_data sxr vdd gnd gnd gnd vdd ext_ps2_vdd gnd gnd gnd gnd gnd gnd y1 4.00mhz c4 10nf +/-10% x7r c6 10nf +/-10% x7r jp1 mdin6_sh 6 4 2 5 3 1 7 8 u1 u r7hcts2_s840 32-pin lqfp 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 syb sxr xpwrs cts/atn vref reset vss2 vdd oscin oscout vss xr1 yb1 yt1 xl1 rts/ss xclk xdat rvsd1 xl2 yt2 yb2 xr2 lb rb rsvd2 txd isel/sclk sout pwr_down sxl syt rn1 4.7k 1 3 5 7 8 6 4 2 c3 10nf +/-10% x7r u2 tc54vc4502ecb 1 2 3 l1 12uh sw2 right button c1 .1uf sw1 left button c5 10nf +/-10% x7r c2 10uf c8 47pf c7 47pf drv_yb _ss sout sense_yt sense_xr _atn sense_xl drv_yt drv_xr sense_yb pwr_on drv_xl sclk spi interface
mechanical information for the fg package copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 13 a e f b y c a 1 a 2 l 1 l detail f e m d m e b 2 i 2 recommended pcb footprint ? 0.1 ? ?? 0.2 ? ? ?? ? ? ? ? ? symbol min nom max a a 2 b c d e h e l l 1 y b 2 dimension in millimeters h d a 1 0.5 ? ? i 2 1.0 ? ? m d 7.4 ? ? m e 7.4 10 ? 0 ? 0.1 1.0 0.7 0.5 0.3 9.2 9.0 8.8 9.2 9.0 8.8 0.8 7.1 7.0 6.9 7.1 7.0 6.9 0.175 0.125 0.105 0.45 0.35 0.3 1.4 0 1.7 e e h e 1 8 9 32 25 24 16 17 h d d
electrical specifications copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 14 absolute maximum ratings ratings symbol value unit supply voltage vdd -0.3 to 7.0 v input voltage vin vss -0.3 to vdd +0.3 v current drain per pin i 20 ma (not including vss or vdd) operating temperature ta t low to t high c UR7HCTS2-S840 -20 to +85 c storage temperature range tstg -40 to +125 c dc electrical characteristics, temperature range=t low to t high unless otherwise noted) characteristic symbol min typ max unit supply voltage 3.0 5.0 5.5 v output voltage (10 a load) voh vdd ? 0.1 v vol 0.1 input high voltage vih 0.8 x vdd vdd v input low voltage vil vss 0.2xvdd v input current iin +/- 10 a supply current (vdd=5.0 vdc+/-10%, vss=0) idd 3.0 tbd 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 ceramic resonator option 4.0 external clock option 4.0
screencoder tm spi/serial bill of materials for page 12 schematic copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 15 UR7HCTS2-S840-fg bom description quantity manufacturer part# description bare pcb: pcb1 1 semtech pcb7-ts2-s840-060 screencoder tm spi/serial pcb capacitors: c1, c4 2 generic any 47pf, 10%, ceramic, x7r or npo, smt size 1206 c2, c3, c7, c8 4 generic any 1f, 16v, tantalum cap, smt, size 1206 c5, c10 2 generic any 10f, 20v, tantalum cap, smt, size c c6, c9 2 generic any 0.1f ceramic chip cap, z5u, smt, 1206 c11-c14 4 generic any .01f, ceramic chip cap, smt, npo, or x7r, 1206 special ics: u1 1 semtech UR7HCTS2-S840-fg screencoder tm spi/serial u4 1 semtech ur6hcasi-s40t-fb spi to serial test chip ics: u2 1 analog devices adm232ljr 232 driver_receiver chip in smt u3, u5 2 telcom tc54vc4302emb 4.3v, volt detector, thd, to-83 inductor: l1 1 generic any 12h inductor, smt, 1210 (3225) push buttons: left, right 2 generic any switch, 8mm, light touch, thd resistor network: rn1 1 cts 744-083-472j 4.7k, 4 resistor, 8 terminals, smt resistors: r1 1 generic any 4.7k resistor, 5% thick film, smt, 1206 r2 1 generic any 10k resistor, 5% thick film, smt, 1206 r3 1 generic any 1m resistor, 5% thick film, smt, 1206 resonators: y1, y2 2 avx pbrc-4.00br 4.00 mhz resonator, smt n n o o t t e e : : auxiliary components are not shown.
copyright ?2000-2001 semtech corporation doc7-ts2-s840-ds-103 www.semtech.com 16 for sales information and product literature, contact: hid & system mgmt division semtech corporation 652 mitchell road newbury park, ca 91320 hidinfo@semtech.com http://www.semtech.com/ 805 498 2111 telephone 805 498 3804 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 corporation. 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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