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revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 1 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface advanced communications & sensing datasheet -----4 the sx8652 is a very low power, high reliability co ntroller for 4-wire and 5-wire resistive touch screens used in pdas, portable instruments and point-of-sales terminal applications. it features a wide input supply range from 1.65v to 3.7v and low power modes to preserve curre nt when the screen is unintentionally touched. to compute touch screen x-y coordinates and touch pressure with precision, a low power 12-bit analog- digital converter is activated with the possibility to enab le on-chip data averaging processing algorithms to reduce host activity and suppress system noise. the touch screen controller inputs have been specia lly designed to provide robust on-chip esd protection o f up to 15kv in both hbm and contact discharge, and elimin ates the need for external protection devices. the sx865 2 is controlled by a high speed spi? serial interface. the sx8652 is available in a 4.0 mm x 3.0 mm 14-dfn package and a 1.5 mm x 2.0 mm wafer level chip scal e package (wlcsp) for space conscience applications. dsc, dvr, cell phones pda, pagers point-of-sales terminals touch-screen monitors extremely low power consumption: 23ua@1.8v 8ksps superior on-chip esd protection 15kv hbm (x+,x-,y+,y-) 2kv cdm 25kv air gap discharge 15kv contact discharge 300v mm single 1.65v to 3.7v supply/reference 4-wire or 5-wire resistive touch screen interface integrated preprocessing block to reduce host loadi ng and bus activity four user programmable operation modes provides flexibility to address different application needs manual, automatic, pen detect, pen trigger low noise ratiometric conversion precision, high speed 12-bit sar adc operating at 7 4k sps throughput: 5000 (x-y) coordinates/second (c/s) wit h 7- sample averaging low power shut-down mode < 1ua spi? serial interface touch pressure measurement (4-wire) auxiliary input (4-wire) for alternate adc input or start of conversion trigger hardware & software reset -40c to +85c operation pb-free, halogen free, rohs/weee compliant product windows ce 6.0, linux driver support available packages: 14-ld (4.0 mm x 3.0 mm) dfn 12-ball (1.5 mm x 2.0 mm) wlcsp general description applications ordering information part number package (dimension in mm) marking sx8652icstrt 1 1. 3000 units / reel 12 - ball wlcsp (1.5x2.0) fg97 sx8652iwltrt 1 14 - lead dfn (4.0x 3.0) fg97 key product features touch s creen interface s x 865 2 v d d x + /b r y + /tr x -/tl y -/b l d in n ir q s c lk d o u t g n d c o ntrol s p i d igital filter ref+ ref- a d c in out o s c p o r v ref n c s a u x /w ip e r v d d t o the h o st t o the touch screen n r s t (d fn only)
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 2 section page advanced communications & sensing datasheet table of contents 1. general description ............................ ................................................... ................................................... ............... 4 1.1. dfn pinout diagram and marking information (t op view)........................................... ................................... 4 1.2. wlcsp pinout diagram and marking information (top view) ......................................... ............................... 4 1.3. pin description.............................. ................................................... ................................................... ............. 5 1.4. simplified block diagram ..................... ................................................... ................................................... ...... 5 2. electrical characteristics ..................... ................................................... ................................................... .............. 6 2.1. absolute maximum ratings ..................... ................................................... ................................................... .. 6 2.2. recommended operating conditions............. ................................................... .............................................. 6 2.3. thermal characteristics ...................... ................................................... ................................................... ....... 6 2.4. electrical specifications .................... ................................................... ................................................... ......... 7 2.5. host interface specifications ................ ................................................... ................................................... ..... 9 2.6. host interface timing waveforms.............. ................................................... ................................................... 9 3. functional description ......................... ................................................... ................................................... ............ 10 3.1. general introduction ........................ ................................................... ................................................... ....... 10 3.2. device interface and esd protection.......... ................................................... ................................................ 11 3.2.1. touchscreen interface...................... ................................................... ................................................... . 11 3.2.2. host interface and control pins ............ ................................................... ............................................... 11 4. 4-wire touch screen detailed description ....... ................................................... .................................................. 12 4.1. touch screen operation....................... ................................................... ................................................... ... 12 4.2. coordinates measurement...................... ................................................... ................................................... . 12 4.3. pressure measurement......................... ................................................... ................................................... ... 13 4.4. pen detection ................................ ................................................... ................................................... .......... 13 5. 5-wire touch screen detailed description ....... ................................................... .................................................. 14 5.1. touch screen operation....................... ................................................... ................................................... ... 14 5.2. coordinates measurement...................... ................................................... ................................................... . 14 5.3. pen detection ................................ ................................................... ................................................... .......... 14 6. data processing ................................ ................................................... ................................................... .............. 15 7. power-up, reset ................................ ................................................... ................................................... ............. 15 8. modes of operation ............................. ................................................... ................................................... ............ 15 8.1. manual mode .................................. ................................................... ................................................... ........ 16 8.2. automatic mode ............................... ................................................... ................................................... ..... 16 8.3. pendet mode .................................. ................................................... ................................................... ...... 17 8.4. pentrig mode ................................. ................................................... ................................................... ...... 17 9. host interface ................................. ................................................... ................................................... ................. 19 9.1. spi read/write registers ..................... ................................................... ................................................... ... 19 9.2. spi reading channel data..................... ................................................... ................................................... . 19 9.3. spi host commands ............................ ................................................... ................................................... ... 20 9.4. spi implementation and multiple read/write ... ................................................... .......................................... 20 9.5. invalid qualified data....................... ................................................... ................................................... ........ 21
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 3 section page advanced communications & sensing datasheet table of contents 9.6. register map................................ ................................................... ................................................... ........... 22 9.7. sx8652 register ............................. ................................................... ................................................... ......... 23 10. application information ...................... ................................................... ................................................... ............. 24 10.1. acquisition setup ........................... ................................................... ................................................... .......... 24 10.2. channel selection........................... ................................................... ................................................... ......... 24 10.3. noise reduction............................. ................................................... ................................................... .......... 24 10.3.1. powdly.................................... ................................................... ................................................... ....... 24 10.3.2. setdly .................................... ................................................... ................................................... ........ 25 10.4. aux input - 4-wire touchscreen only ......... ................................................... ................................................. 2 5 10.5. interrupt generation........................ ................................................... ................................................... ......... 25 10.6. coordinate throughput rate .................. ................................................... ................................................... . 25 10.6.1. spi communication time .................... ................................................... ................................................ 25 10.6.2. conversion time ........................... ................................................... ................................................... .... 26 10.7. esd event................................... ................................................... ................................................... ............. 26 11. packaging information ......................... ................................................... ................................................... ............ 27 11.1. dfn package................................. ................................................... ................................................... .......... 27 11.2. wlcsp package ............................... ................................................... ................................................... ...... 28
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 4 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 1. general description 1.1. dfn pinout diagram and marking information (t op view) figure 1. sx8652 dfn top view, pad on bottom side yyww: date code xxxxx: lot number 1.2. wlcsp pinout diagram and marking information (top view) figure 2. sx8652 wlcsp top view, solder bumps on bottom side yyww: date code xxxxx: lot number 1 2 3 4 5 6 14 13 12 11 10 9 aux/ wiper (nc) vdd x+/br y+/tr x-/tl nrst din ncs nirq dout y-/bl 15 7 gnd 8 sclk pin 1 identifier fg97 yyww xxxxx # a nirq sclk dout b c d 32 1 vdd ncs gnd din x+/br y+/tr y-/bl x-/tl aux/wiper fg97 yyww xxxxxx ball a1 identifier
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 5 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 1.3. pin description table 1. pin description 1.4. simplified block diagram the sx8652 simplified block diagram is shown in fig ure 3. figure 3. simplified block diagram of the sx8652 pin number # name type description dfn wlcsp 1 a1 aux/wiper digital input / analog input conversion synchronization (4-wire) or analog auxiliary input (4-wire) / wiper input (5-wire ) 2 a2 vdd power input input power supply, connect to a 0.1u f capacitor to gnd 3 a3 x+/br analog io x+ right electrode (4-wire) / bottom rig ht (5-wire) channel 4 b3 y+/tr analog io y+ top electrode (4-wire) /top right ( 5-wire) channel 5 c3 x-/tl analog io x- left electrode (4-wire) /top left (5-wire) channel 6 d3 y-/bl analog io y- bottom electrode (4-wire) /bottom l eft (5-wire) channel 7 d2 gnd ground ground 8 d1 sclk digital input spi serial clock input 9 c2 din digital output spi serial data input 10 c1 dout digital output spi serial data output 11 b1 nirq digital output, open drain interrupt request output, active low, need external pull-up 12 b2 ncs digital input spi chip select input, active low 13 - nrst digital input dfn package only, reset input, ac tive low, internal pull-up resistor 14 - (nc) not connected 15 - gnd power input backside ground touch screen interface sx8652 vdd x+/br y+/tr x-/tl y-/bl din nirq sclk dout gnd control spi digital filter ref+ ref- adc in out osc por vref ncs aux/wiper vdd to the host to the touch screen nrst (dfn only)
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 6 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 2. electrical characteristics 2.1. absolute maximum ratings stresses above the values listed in absolute maximu m ratings may cause permanent damage to the device . this is a stress rating only and functional operati on of the device at these, or any other conditions beyond the recommended operating conditions, is not implied. exposure to absolute ma ximum rating conditions for extended periods may af fect device reliability . (i) tested to tlp (10a) (ii) tested to jedec standard jesd22-a114 (iii) tested to jedec standard jesd78 2.2. recommended operating conditions 2.3. thermal characteristics ( iii) q ja is calculated from a package in still air, mounted to 3" x 4.5", 4 layer fr4 pcb with thermal vias und er exposed pad (if applicable) per jesd51 standards. parameter symbol min. max. unit supply voltage v ddabs -0.5 3.9 v input voltage (non-supply pins) v in -0.5 3.9 v input current (non-supply pins) i in 10 ma operating junction temperature t jct 125 c reflow temperature t re 260 c storage temperature t stor -50 150 c esd hbm (human body model) high esd pins: x+/br, x-/tl, y+/tr, y-/bl, aux/wiper esd hbm1 15 (i) kv 8 (ii) kv all pins except high esd pins esd hbm2 2 kv esd (contact discharge) high esd pins: x+/br, x-/tl, y+/tr, y-/bl, aux/wiper esd cd 15 kv latchup (iii) i lu 100 ma table 2. absolute maximum ratings parameter symbol min. max unit supply voltage v dd 1.65v 3.7 v ambient temperature range t a -40 85 c table 3. recommended operating conditions parameter symbol min. max unit thermal resistance with dfn package - junction to am bient (iii) q ja 39 c/w thermal resistance with wlcsp package - junction to am bient (iii) q ja 65 c/w table 4. thermal characteristics
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 7 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 2.4. electrical specifications all values are valid within the recommended operati ng conditions unless otherwise specified. parameter symbol conditions min. typ max unit current consumption mode = manual i pwd converter stopped, pen detection off, spi listening, osc stopped 0.4 1 ua mode = pendet i pndt converter stopped, pen detection activated, device generates interrupt upon detection, spi listening, osc stopped 0.4 1 ua mode =pentrig i pntr converter stopped, pen detection activated, device starts conversion upon pen detection. spi listening, osc stopped 0.4 1 ua mode=auto i auto converter stopped, pen detection off, spi listening, osc on, timer on 1.5 ua operation @8ksps, vdd=1.8v i opl 23 50 ua operation @42ksps, vdd=3.3v i oph 105 140 ua digital i/o high-level input voltage v ih 0.8v dd v dd +0.2 v low-level input voltage v il v ss -0.3 0.2v dd v hysteresis v hyslow vdd > 2v 0.05 v dd v v hyshigh vdd < 2v 0.1 v dd v output logic high v oh i oh >-2ma 0.8v dd output logic low v ol i ol <2ma 0 0.4 v input leakage current l i cmos input 1 ua high esd input - output capacitance c x+/br ,c x-/tl ,c y+/tr , c y-/bl, c aux 50 pf input - output capacitance c nrst , c nirq ,c ncs ,c din , c dout, c sclk 5 pf table 5. electrical specifications
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 8 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface startup power-up time t por time between rising edge vdd and rising nirq 1 ms adc resolution a res 12 bits offset a off 1 lsb gain error a ge at full scale 0.5 lsb differential non linearity a dnl 1 lsb integral non linearity a inl 1.5 lsb resistors x+, x-, y+, y- resistance r chn touch pad biasing resistance 5 ohm pen detect resistance r pndt_00 r pndt = 0 100 kohm r pndt_01 r pndt = 1 200 kohm r pndt_10 r pndt = 2 50 kohm r pndt_11 r pndt = 3 25 kohm external components recommendations capacitor between vdd, gnd c vdd type 0402, tolerance +/-50% 0.1 uf parameter symbol conditions min. typ max unit table 5. electrical specifications
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 9 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 2.5. host interface specifications (i) all timing specifications refer to voltage level s (50% vdd, v oh , v ol ) defined in table 6 unless otherwise mentioned. table 6. host interface specifications 2.6. host interface timing waveforms figure 4. spi timing waveform parameter symbol condition min typ max unit spi timing specifications (i) sclk clock frequency duty cycle f sclk duty 40 5000 60 khz % ncs edge to first sclk t css 50 ns ncs edge to dout low t dcd 100 sclk high pulse width t ckh 80 sclk low pulse width t ckl 80 data setup time t ds 40 data valid to sclk hold time t dh 70 data output delay after sclk t dod 70 ncs to sclk ignored t csi 50 ncs to dout hi-z state t ccz 90 ncs hold time t csw 150 tckh tds tdh tcss tckl tdcd tdod tcsw tcsi tccz csn sclk din dout d11 vol voh 50%vdd 50%vdd 50%vdd
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 10 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 3. functional description 3.1. general introduction this section provides an overview of the sx8652 arc hitecture, device pinout and a typical application. the sx8652 is designed for 4-wire and 5-wire resist ive touch screen applications. the touch screen or touch panel is the resistive sensor and can be activated by either a f inger or stylus. when the top layer is pressed, it makes contact with the bottom sheet and the touch location can be measured . as shown in figure 5 with a 4-wire panel, the touch screen coordinates and touch pressure are converted into spi format by the sx8652 for transfer to the host. the auxilia ry input can be used to convert with 12-bit resolut ion any analog input in the supply range. it can also serves as an external synchronisation input to trig the touchscreen acqu isition as described in the application information section. figure 5. sx8652 with a 4-wire touch screen a 5-wire touchscreen application is shown in figure 6. the 5-wire top sheet acts as a voltage measuring probe. the measurement accuracy is not affected by damage on t his sheet and consequently the reliability is impro ved but the touch pressure can not be calculated. figure 6. sx8652 with a 5-wire touch screen touch screen interface sx8652 vdd x+/br y+/tr x-/tl y-/bl din nirq sclk dout gnd control spi digital filter ref+ ref- adc in out osc por vref ncs aux/wiper vdd nrst (dfn only) host int dio cs sclk miso mosi spi interface 4-wire touchscreen touch screen interface sx8653 vdd x+/br y+/tr x-/tl y-/bl din nirq sclk dout gnd control spi digital filter ref+ ref- adc in out osc por vref ncs aux/wiper vdd nrst (dfn only) host int dio cs sclk miso mosi spi interface 5-wire touchscreen
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 11 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 3.2. device interface and esd protection the touch screen controller inputs have been specia lly designed to provide robust on-chip esd protecti on of up to 15kv in both hbm and contact discharge. 3.2.1. touchscreen interface the x+/br, x-/tl, y+/tr,y-/bl, aux/wiper are the pi ns dedicated for the touchscreen interface. it prov ides the voltage sequence in order to obtain the coordinates and pre ssure measurement. the five pins are connected to br, tl, tr, bl, wipe r on a 5-wire touchscreen. they are the electrodes on the 4 corners of the bottom layer of the touchscreen plus the ele ctrode on the top layer. on a 4-wire touchscreen, only 4 electrodes are used : x+,x-,y+,y-. the aux pin is not needed and theref ore can be used to convert an analog signal (range gnd - vdd) into 12-bit digital value. the touchscreen interface pin s are the most exposed pins for an esd event. as shown in figure 7, theses pins have internal esd protection to ground and vdd. 3.2.2. host interface and control pins the sx8652 is a slave device configured via the spi interface. nirq provides an interrupt to the host processor wh en a pen is detected or when channel data is availa ble. the nirq pin is an active low, open drain output to facilitate i nterfacing to different supply voltages and thus re quires an external pull-up resistor (1-10 kohm). the host can reset the chip via the spi interface o r with the dedicated pin nrst. the nrst pin is an a ctive low input that provides a hardware reset. an internal pull-up enab les the interfacing with devices at different suppl y voltage. nrst and nirq pins are protected to ground. figure 7. esd protection t o u c h s c r e e n d r iv e r s i n t e r f a c e r c h n a dc c o n tr o l d a t a p r o c e s s in g x + / b r x - / t l y + / t r y - /b l a u x / w ip e r m u x r c h n r c h n r c h n p o w e r m a n a g e m e n t v d d g n d n r s t n ir q s p i ncs sclk dout din
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 12 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 4. 4-wire touch screen detailed description 4.1. touch screen operation a 4-wire resistive touch screen consists of two res istive sheets separated by an insulator (figure 4.2) . figure 8. 4-wire touch screen when a pressure is applied on the top sheet with a stylus for example, a connection with the lower she et is made. the contact point split the rxtot bottom resistance in the vertical axis into two re sistances r1 and r2 . in the same way, the rytot resistance in the hor izontal axis of the top sheet is divided into two resistances r3 and r4 . the touchscreen controller imposes a voltage level on x or y electrodes allowing the detection of the contact position. 4.2. coordinates measurement during the touch, the top and bottom touchscreen la yers are connected. the resistance between the two sheet s is r t . a current coming from the reference voltage goes from x+ to x- to perform the x coordinate measurement. figure 9 shows the measurement schematics. since the adc had a high input impedance, no curren t flows through r t and r3. the positive adc input is biased with a voltage created by the r1, r2 voltage divider. the conversion with the 12 bit adc gives the x loca tion. figure 9. abscissa (x) coordinates measurement the y coordinate is measured in a similar fashion w ith the measurement setup given in table 7. x- y+ y- x+ t o p c o n d u c t i v e s h e e t b o t t o m c o n d u c t i v e s h e e t y e l e c t r o d e s x e l e c t r o d e s y - y + r y t o t top conductive sheet before the stylus contact y - y + r 4 r 3 top conductive sheet after the stylus contact contact point with the top conductive sheet rxtot r 1 r 2 + = rytot r 3 r 4 + = x- x+ r2 r1 + - r t y- y+ r4 r3 xpos + - adc vref xpos 4095 r 2 r 1 r 2 + -------------------- = ypos 4095 r 4 r 3 r 4 + -------------------- =
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 13 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 4.3. pressure measurement the 4-wire touchscreen allows pressure measurement. the contact resistance between the two sheets are a function of the pressure applied on the top sheet. indeed, the a low pressure applied with the finger will create a small contact area. with a greater pressure, the contact area will be b igger and the r t resistance smaller. the r t contact resistance is therefore an indication of t he applied pressure. r t is deducted from z1 and z2 measurement. the measurement setup given in table 7 allows to fin d z1 and z2. arranging z1 and z2 with rxtot and rytot allows the computation of r t . an alternative calculation method is using xpos and ypos. table 7. measurement setup 4.4. pen detection the pen detection circuitry is used to detect a use r action on the touchscreen. the contact between the two layers gen erates an interrupt or starts an acquisition sequence. doing a pen detection prior to conversion avoids fe eding the host with dummy data and saves power. if the touchscreen is powered between x+ and y- thr ough a resistor r pndt , no current will flow so long as pressure is not app lied to the surface (see figure 10). when a pressure is applied, a current path is creat ed and brings x+ to the level defined by the resistive divider determined b y r pndt and the sum of r1, r t and r4. figure 10. 4-wire pen detection circuitry r pndt should be set to the greatest value of 200 kohm fo r optimal detection (see table 15). increasing powdl y settings can also improve the detection on panel with high r esistance. the pen detection will set the penirq bit of the re gstat register. the penirq bit will be cleared and the nirq will be de- asserted as soon as the host reads the status regis ter. in pendet mode, the pen detection will set nirq low . measurement vref + vref- adc + x x+ x- y+ y y+ y- x+ z1 x+ y- y+ z2 x+ y- x- z 1 4095 r 4 r 1 r 4 r t + + --------------------------------- = z 2 4095 r 4 rt + r 1 r 4 r t + + --------------------------------- = r t rytot ypos 4095 ------------ z 2 z 1 ----- 1 C = r t rytot y pos 4095 ------------------------------- 4095 z 1 ------------ 1 C rxtot 1 xpos 4095 ------------- C C = x- x+ r2 r1 vref + - r t y- y+ r 4 r3 r pndt sb rb irq q q internal logic
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 14 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 5. 5-wire touch screen detailed description 5.1. touch screen operation as the 4-wire, the 5-wire resistive touch screen co nsists of two resistive sheets separated by an insulator (figure 11). the ma in difference is that the 4 wires are connected on the 4 corners of the b ottom conductive sheet. they are referred as top left, top right, bo ttom left, bottom right. the fifth wire is embedded in the top sheet and is used for sensing the electrode voltage and is referred as the wiper. figure 11. 5-wire touchscreen 5.2. coordinates measurement when the electrodes tl is connected with bl and tr with br, they form with the linearization pattern 2 electrodes bars which are very similar to the x electrodes in a 4-w ire touchscreen. in the same way, the association o f tl with tr and bl with br create y electrodes. the four corners are therefore able to produce volt age gradients in the horizontal and vertical axis. the wiper is connected to the high input impedance of the adc. when a pres sure is applied on the top sheet, the contact point split the bottom sheet resistance into r1 and r2 on the x axis and r 3 and r4 on the y axis. the x and y position converted by the 12-bit adc gives the following result. 5.3. pen detection the br pin is connected to the positive pin of the reference voltage through r pndt . the wiper panel is grounded at the aux/wiper pin to provide the grounding path for a screen touch event. the br pin is monitored to detect voltage drop. whe n a pressure is applied on the top surface, a current path is created between the two layers and the penirq bit of the regstat register will be set. r pndt should be set to the greatest value of 200 kohm for optimal detection (s ee table 15). increasing powdly settings can also improve the detection on p anel with high resistance. in pendet mode, the pen detection will set nirq low . figure 12. 5-wire pen detection circuitry t l b l b o t t o m c o n d u c t i v e s h e e t t r b r t o p c o n d u c t i v e s h e e t w i p e r l i n e a r i s a t i o n p a t t e r n xpos 4095 r 2 r 1 r 2 + -------------------- = ypos 4095 r 4 r 3 r 4 + -------------------- = br r1 vref + - aux/ wiper - r pndt sb rb q q internal logic bottom layer top layer
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 15 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 6. data processing the sx8652 offers 4 types of data processing which allows the user to make trade-offs between data thr oughput, power consumption and noise rejection. the parameter filt is used to select the filter order n filt as seen in table 8. the sn samples from the adc can be averaged. the processe d cn 12-bit value is then send through the spi bus. the noise rejection will be improved with a high or der to the detriment of the power consumption. the k coefficient in table 8 is a filter constant. i ts value is k=4079/4095. table 8. filter order 7. power-up, reset during power-up, nirq pin is kept low, the por rese t all registers and states of the sx8652. the sx8652 is n ot accessible and spi communications are ignored. as soon as nirq rises, the sx8652 is in manual mode with only the spi peripheral enabled to minimize power consumption. the host can reset the sx8652 by setting the nrst p in low or via the spi bus. writing the code 0xde to the regis ter regsoftreset reset the circuit. when nrst is driven low by the host, nirq will be d riven low by the sx8652. after the reset nirq will be release d by the sx8652. figure 13. power-up, nirq 8. modes of operation the sx8652 has four operation modes that are config ured using the spi commands as defined in table 13 a nd table 15. these 4 modes are: manual (command manauto and rate=0), automatic (command manauto and rate>0), pen detect (command pendet), pen trigger mode (command pentrg). filt n filt explanation processing 0 1 no average 1 3 3 adc samples are averaged 2 5 5 adc samples are averaged 3 7 7 adc samples are sorted and the 3 center samples are averaged s n c n = s n 13 --- k c n c n 1 C c n 2 C + + ( ) = s n 1 5 --- k c n c n 1 C c n 2 C c n 3 C c n 4 C + + + + ( ) = c max 1 c max 2 c a c b c c c min 1 c min 2 3 3 3 3 3 3 s n 1 3 --- k c a c b c c + + ( ) = voltage time voltage time vdd nirq t por vdd/2
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 16 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface in the pendet mode the pen detection is activated. the sx8652 will generate an interrupt (nirq) upon p en detection and set the penirq bit in the spi status register. to q uit the pendet mode the host needs to configure the manual mode. in the pentrg mode the pen detection is activated a nd a channel conversion will start after the detect ion of a pen. the sx8652 will generate an interrupt (nirq) upon pen d etection and set the convirq bit in the spi status register. to quit the pentrig mode the host needs to configure the ma nual mode. the pentrg mode offers the best compromi se between power consumption and coordinate throughput . 8.1. manual mode in manual mode (rate=0), the host sequences all the actions by the spi commands described in table 9. when a command is received, the sx8652 executes the associated task and waits for the next command. table 9. convert and select command the channel can be biased for an arbitrary amount o f time by first sending a select command and then a convert command once the settling time requirement is met. the select command can be omitted if the large rang e of powdly settings cover the requirements. in the latter case, the convert command alone is enough to perform an a cquisition. with chan=seq, multiple channels are sampled. this requires programming the powdly field in register r egctrl0. the selected channel will be powered during powdly before a conversion is started. the channel bias is automatically removed after the conversion has completed. 8.2. automatic mode in automatic mode (rate > 0), sx8652 start the acqu isition when a touch is detected. it converts all t he channels selected with regchnmsk and set nirq low when it is finished . after the host has read the channels, if condirq=1 and the touch is detected again, the sx8652 starts a new conversion cycle. to not loose data, the sx8652 does not begin conver sion before the host read all the channels. we can define the time ts between the start of the conversion and the end of the channels reading by the host. the rate programmed is achieved if ts <1/rate otherwise the new rate is 1/ ts . when the control condirq bit (see register regstat table 15) is set to 1 then the interrupts will onl y be generated if the pen detect occurred. this result in a regular inter rupt stream, as long as the host performs the read channel commands, and the screen is touched. when the screen is not t ouched, interrupts does not occur. if the control condirq bit is cleared to 0, the i nterrupts will be always generated. in case there i s no pen detected on the screen then the coordinate data will be qualified a s invalid, see section [9.5]. this result in a regu lar interrupt stream as long as the host performs the read channel commands , this working is illustrated in figure 16. figure 14 shows the spi working in automatic mode wi th condirq=1. after the first sentence send through the spi to make the initialization, traffic is reduced as only reads are required. command action convert(chan) select and bias a channel wait for the programmed settling time (powdly) start conversion select(chan) select and bias a channel
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 17 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface the processing time is the necessary time for the sx8652 to makes the pen detection, the settling time (powdly) and the conversion of the selected channels. this time increases with the number of channel selected and the filter used. nirq interrupt signal notifies the host when the conversions are done. the host just need to read the channels data to release the interrupt. figure 14. spi working in auto mode 8.3. pendet mode the pendet mode can be used if the host only needs to know if the screen has been touched or not and t ake from that information further actions. when pen detect circui try is triggered the interrupt signal nirq will be generated and the status register bit penirq will be set. the bit is clear ed by reading the status register regstat. the pend et working is illustrated in figure 16. 8.4. pentrig mode the pentrig mode offers the best compromise between power consumption and coordinate throughput. in this mode the sx8652 will wait until a pen is detected on the screen and then starts the coordinate conversions. the host will be signaled only when the screen is touched and coordinates are available. the flowchart is describes in figure 16. the coordinate rate in pen trigger mode is determined by the speed of the host reading the channels and the conversion times of the channels. the host performs the minimum number of spi commands in this mode. the host has to wait for the nirq interrupt to make the acquisition of the data. the spi working is illustrated in figure 15. figure 15. spi working in pentrig mode cs din dout touch nirq read channel data cmd data from sx8652 processing time time is 1/ rate cs din dout touch nirq read channel data cmd data from sx8652 conversion time
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 18 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface figure 16. auto, pendet and pentrig mode flowchar t touch detected ? start channel conversion set interrupt nirq=0 release interrupt nirq=1 all channel data read all conversion finished yes no pentrig mode condirq=1 ? touch detected ? set timer=rate start timer start channel conversion set interrupt nirq=0 release interrupt nirq=1 yes timer expire all channel data read all conversion finished yes no auto mode touch detected ? set interrupt nirq=0 release interrupt nirq=1 regstat read yes no pendet mode
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 19 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 9. host interface the host interfaced is composed of a spi bus. it pe rforms the read/ write operations on the registers and channels data. 9.1. spi read/write registers the write command allows the host to write a single or multiple registers in the sx8652. the host can read single or multiple registers from the sx8652 by the read comm and. this is defined in table 10. 9.2. spi reading channel data five channels can be sampled by the sx8652: x, y, z 1, z2 and aux. they are defined in table 12. they ca n be converted in sequence with the regchanmsk register. the readchan command allows the host to read the da ta obtained after the channels conversion and proce ssing. table 11. read channels data the channel data are 12-bit of unsigned format whic h corresponds to integers between 0 and 4095. this is send on two bytes, msb first then lsb. a mask with the value 0x 0fff (4095) must be done to filter the four first u nknown bit. when a channel data has been transmitted, the next one is sent in the successive order: x,y, z1, z2 an d aux. if a channel has not been converted, the data is not transmitted . when the channel data buffer gets empty, the data w ill carry an invalid data as explained in the chann el data format. remark: after a conversion sequence, it is possible to read only one time the same channel. example: the sx8652 is set to convert x and y. the value 0xc0 is set in regchanmsk. the first byte rea d after the readchan command will be x(msb), then x(lsb), y(msb ) and at the end y(lsb). if the host carry on the r eading, it will get invalid data. w/r command name cr(7:0) function 7 6 5 4 3 2 1 0 write(ra) 0 0 0 ra(4:0) write register (see table 14 for ra) read(ra) 0 1 0 ra(4:0) read register (see table 14 for ra ) table 10. w/r commands w/r command name cr(7:0) function 7 6 5 4 3 2 1 0 readchan 0 0 1 x x x x x read data from channel channel chan(2:0) function 2 1 0 x 0 0 0 x channel y 0 0 1 y channel z1 0 1 0 first channel for pressure measurement z2 0 1 1 second channel for pressure measurement aux 1 0 0 auxiliary channel reserved 1 0 1 reserved 1 1 0 seq 1 1 1 channel sequentially selected from regchanmsk register, (see table 15) table 12. channel definition
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 20 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 9.3. spi host commands .the host can issue commands to change the operatio n mode or perform manual actions as defined in tabl e 13. 9.4. spi implementation and multiple read/write the spi implemented on the sx8652 is set to the com mon setting cpol=0 and cpha=0 which means data are sampled on the rising edge of the clock, and shifted on the falling one. the default state of the clock when ncs gets assert ed is low. if a host send a command while the syste m is busy, the command is discarded. the spi protocol is designed to be able to do multi ple read/write during a transaction. during one sin gle operation, as long as ncs stay asserted, the register address is autom atically increased to allow sequential read/write ( or sequential retrieval of data). between each different operation though ( read/write/readchan), the communication should be r estarted. this is described in figure 17. command name cr(7:0) function 7 6 5 4 3 2 1 0 select(chan) 1 0 0 0 x chan(2:0) bias channel (see table 12 for chan) convert(chan) 1 0 0 1 x chan(2:0) bias channel (see table 1 2 for chan) manauto 1 0 1 1 x x x x enter manual or automatic mode. pendet 1 1 0 0 x x x x enter pen detect mode. pentrg 1 1 1 0 x x x x enter pen trigger mode. table 13. host commands
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 21 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface figure 17. data channel format 9.5. invalid qualified data the sx8652 returns 0xffff data in case of invalid q ualified data. this occurs: when the sx8652 has read all the channel data in th e fifo when a conversion is done without a pen being detec ted. ncs sclk din dout 11 10 9 8 7 6 5 4 3 2 1 0 0 0 1 11 10 9 8 7 6 5 4 3 2 1 0 reading channel data ncs sclk din dout 7 6 5 4 3 2 1 0 0 1 0 ra[4:0] reading register 7 6 5 4 3 2 1 0 ncs sclk din dout 0 0 0 ra[4:0] writing register 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 multiple write single write multiple read single read multiple read single read ncs sclk din dout other command cmd unknown bit multiple access single access
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 22 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 9.6. register map the details of the registers are described in the n ext sections. register address ra(4:0) register description 0 0000 regctrl0 write, read 0 0001 regctrl1 write, read 0 0010 regctrl2 write, read 0 0100 regchanmsk write, read 0 0101 regstat read 1 1111 regsoftreset write table 14. register address
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 23 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 9.7. sx8652 register register bit default description regctrl0 7:4 0000 rate set rate in coordinates per sec (cps) ( 20%) if rate =0: manual mode. if rate >0: automatic mode 0000: timer disabled -manual mode 0001: 10 cps 0010: 20 cps 0011: 40 cps 0100: 60 cps 0101: 80 cps 0110: 100 cps 0111: 200 cps 1000: 300 cps 1001: 400 cps 1010: 500 cps 1011: 1k cps 1100: 2k cps 1101: 3k cps 1110: 4k cps 1111: 5k cps 3:0 0000 powdly conversion (or first conversion when filtering is e nabled) settling time ( 10%) 0000: immediate (0.5 us) 0001: 1.1 us 0010: 2.2 us 0011: 4.4 us 0100: 8.9 us 0101: 17.8 us 0110: 35.5 us 0111: 71.0 us 1000: 0.14 ms 1001: 0.28 ms 1010: 0.57 ms 1011: 1.14 ms 1100: 2.27 ms 1101: 4.55 ms 1110: 9.09 ms 1111: 18.19 ms regctrl1 7:6 00 auxaqc 00: aux is used as an analog input (4- wire only) 01: on rising aux edge, wait powdly and start acquisition 10: on falling aux edge, wait powdly and start acquisition 11: on rising and falling aux edges, wait powdly and start acquisition the aux trigger works only in manual mode with 4-wi re touchscreen 5 1 condirq enable conditional interrupts 0: interrupt always generated at end of conversion cycle. if no pen is detected the data is set to invalid qualified. 1: interrupt generated when pen detect is successful 4 0 screen select the type of screen: 0: 4-wire 1: 5 -wire 3:2 00 rpdnt select the pen detect resistor 00: 100 kohm 01: 200 kohm 10: 50 kohm 11: 25 kohm 1:0 00 filt digital filter control 00: disable 01: 3 sample averaging 10: 5 sample averaging 11: 7 sample acquisition, sort, average 3 middle samples regctrl2 7:4 0 reserved 3:0 0000 setdly settling time while filtering ( 10%) 0000: immediate (0.5 us) 0001: 1.1 us 0010: 2.2 us 0011: 4.4 us 0100: 8.9 us 0101: 17.8 us 0110: 35.5 us 0111: 71.0 us 1000: 0.14 ms 1001: 0.28 ms 1010: 0.57 ms 1011: 1.14 ms 1100: 2.27 ms 1101: 4.55 ms 1110: 9.09 ms 1111: 18.19 ms table 15. sx8652 register
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 24 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 10. application information this section describes in more detail application o riented data. 10.1. acquisition setup prior to an acquisition, the sx8652 can be setup by writing the control registers. registers are writt en by issuing the register write command. they can be read by issuing the read command. please refer to the section [9.7 ]. 10.2. channel selection the sx8652 can be setup to start a single channel c onversion or to convert several channels in sequenc e. for a single conversion, the channel to be converted is determin ed from the chan(2:0) field in the command word (de fined in table 12). several channels defined in regchanmsk can be acqui red sequentially by setting the chan(2:0) field to seq. the channels will be sampled in the order x, y, z1, z2, aux. 10.3. noise reduction a noisy environment can decrease the performance of the controller. for example, an lcd display locate d just under the touch screen can adds a lot of noise on the high im pedance a/d converter inputs. 10.3.1. powdly in order to perform correct coordinates acquisition properly, some time must be given for the touch sc reen to reach a proper level. it is a function of the pcb trace res istance connecting the sx8652 to the touchscreen an d also the regchanmsk 7 1 xconv 0: no sample 1: sample x channel 6 1 yconv 0: no sample 1: sample y channel 5 0 z1conv 0: no sample 1: sample z1 channel 4 0 z2conv 0: no sample 1: sample z2 channel 3 0 auxconv 0: no sample 1: sample aux channel 0 0 reserved 0 0 reserved 0 0 reserved regstat host writing to this register is ignored. 7 0 convirq 0: no irq pending 1: conversion sequence finished irq is cleared by the channel data read command 6 0 penirq operational in pen detect mode 0: no irq pending 1: pen detected irq pending irq is cleared by the regstat reading 5 1 rstevent a reset event has occurred 4:0 00000 reserved regsoftreset 7:0 0x00 writing 0xde to this register reset the sx86 52 any other data will not affect the sx8652 register bit default description table 15. sx8652 register
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 25 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface capacitance of the touchscreen. we can define tau a s the rc time constant. powdly duration should be p rogrammed to 10 tau to reach 12 bit accuracy. adding a capacitor from the touch screen drivers to ground is a solution to minimize external noise bu t it increases settling time and consequently the power consumption. 10.3.2. setdly a best method to filter noise is described in secti on [6] (data processing). when filtering is enabled , the channel will be biased initially during a time of powdly for the fi rst conversion. the parameter setdly sets the settl ing time between the subsequent conversions in a filter set. in most app lications, setdly can be set to 0. in applications with a high tau and where accuracy of 1lsb is required setdly should be increased. 10.4. aux input - 4-wire touchscreen only the aux input can be used to sample an analog signa l in the range 0-vdd. for system supply by battery, the battery voltage can be monitored for example. the conversio n is done in sequence with the touchscreen acquisit ion therefore the sample rate is defined with regctrl0 in auto mode. the aux pin can also triggered conversions. a risin g edge, a falling edge or both applied on the aux p in can trigger the conversion. this is defined by auxacq in regctrl1. this method can be used to sample touchscreen when there is noise-free periods. 10.5. interrupt generation an interrupt (nirq=0) will be generated: during the power-up phase or after a reset after completion of a conversion in manual, pentrig or auto mode. convirq (bit [7] of regstat) will be set at the same time. after a touch on the panel being detected in pendet mode. penirq (bit [6] of regstat) will be set at t he same time. the nirq will be released and pulled high(nirq=1) b y the external pull-up resistor: when the power-up phase is finished when the host read all channels data that were prev iously converted by the sx8652 in manual, pentrig o r auto mode. convirq will be cleared at the same time. when the host read the status register in pendet mo de. penirq, will be cleared at the same time. an active nirq (low) needs to be cleared before any new conversions will occur. 10.6. coordinate throughput rate the coordinate throughput rate depends on the follo wing factors: the spi communication time: t com the conversion time: t conv the coordinate rate is the frequency to get the x, y, z1 and z2 coordinate: 10.6.1. spi communication time the minimum time to read the channel data in pentri g mode is: the highest throughput will be obtained with a spi frequency of 5mhz when the host read the channel da ta as quickly as possible after the nirq falling edge. coordrate 1 t com t conv + ------------------------------- = t com 8 16 n chan + ( ) t spi =
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 26 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 10.6.2. conversion time the maximum possible throughput can be estimated wi th the following equation with: n filt = {1,3,5,7} based on the order defined for the fil ter filt (see figure 8). n chan = {1,2,3,4,5} based on the number of channels defi ned in regchanmsk powdly = 0.5us to 18.19ms, settling time as defined in regctrl0 setdly = 0.5us to 18.19ms, settling time when filte ring as defined in regctrl2 tosc is the oscillator period (555ns +/- 15%) table 16 gives some examples of coordinate rate and sample rate for various setting in pentrig mode. 10.7. esd event in case of esd event, the chip may reset to protect its internal circuitry. the bit rstevent indicates that a reset event has occurs. esd event may trig the pen detection circuitry. in this case wrong data will be send to the host. to d etect this false coordinates on 4-wire touchscreen, z1 and z2 can be read. the conditions z1highth reshold indicate an esd event. the values lowthreshold and highthreshold are given for indication only on the table below and should be fine tune according to the system. nch [1..5 ] nfilt [1 3 5 7] powdly [us] setdly [us] tconv [us] tcomm [us] coordrate [ksps] 2 1 0.5 - 51 8 16.7 2 3 71 0.5 190 8 5.0 4 3 140 0.5 740 14 1.3 table 16. coordinate throughput examples lowthreshold highthreshold 10 4070 table 17. threshold to detect false coordinates t conv 47 t osc n + chan powdly setdly n filt 1 C ( ) t osc 21 n filt 1 + ( ) + + [ ] =
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 27 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 11. packaging information 11.1. dfn package figure 18. dfn package outline drawing figure 19. dfn package land pattern millimeters 0.50 bsc 0.00 a1 e1 aaa bbb n el a2 d1 d e b 1.55 0.30 3.90 2.90 3.05 - 0.18 dim a dimensions 0.70 min 0.02 0.05 3.10 4.10 1.80 3.30 0.50 0.30 1.70 0.40 0.10 0.08 14 3.00 (0.20) 3.20 4.00 0.25 - 0.80 max - nom a b pin1 indicator (laser mark) aaa c c seating plane 1 2 n bbb c a b coplanarity applies to the exposed pad as well as t he terminals. controlling dimensions are in millimeters (angles i n degrees). notes: 2. 1. d e a1 e bxn d1 d/2 e/2 e1 lxn a a2 1. controlling dimensions are in millimeters (angles i n degrees). failure to do so may compromise the thermal and/or functional performance of the device. shall be connected to a system ground plane. thermal vias in the land pattern of the exposed pad 3. this land pattern is for reference purposes only. consult your manufacturing group to ensure your notes: 2. dim xy h kp c g millimeters (2.90) 0.30 0.70 1.70 0.50 3.30 2.20 dimensions company's manufacturing guidelines are met. 3.60 z
revision v1.7/october 2010 ?2010 semtech corp. sx8652 www.semtech.com page 28 advanced communications & sensing datasheet 15kv esd low power 4-wire / 5-wire resistive touchscreen controller with spi interface 11.2. wlcsp package figure 20. wlcsp package outline drawing figure 21. wlcsp land pattern of wlcsp 0.10 c 0.08 c 0.05 c a b controlling dimensions are in millimeters notes: 1. a b c a b c index area a1 corner 0.250.02 seating 1 2 3 d 1.50.10 2.00.10 0.50 1.00 0.25 0.50 1.50 12x ?0.3150.03 plane 0.625 max. this land pattern is for reference purposes only. consult your manufacturing group to ensure your notes: 2. company's manufacturing guidelines are met. 1. controlling dimensions are in millimeters 0.50 0.25 1.50 0.50 1.00 12x ?0.25
sx8652 www.semtech.com page 29 iso9001 certified advanced communications & sensing datasheet ? s e m te c h 2 0 1 0 a ll rig h ts re s e rv e d . r e p ro d u c tio n in w h o le o r in p a rt is p ro h ib ite d w ith o u t th e p rio r w ritte n c o n s e n t o f th e c o p y rig h t o w n e r. t h e in fo rm a tio n p re s e n te d in th is d o c u m e n t d o e s n o t fo r m p a rt o f a n y q u o ta tio n o r c o n tra c t, is b e lie v e d to b e a c c u ra te a n d re lia b le a n d m a y b e c h a n g e d w ith o u t n o tic e . n o lia b ility w il l b e a c c e p te d b y th e p u b lis h e r fo r a n y c o n s e q u e n c e o f its u s e . p u b lic a tio n th e re o f d o e s n o t c o n v e y n o r im p ly a n y lic e n s e u n d e r p a te n t o r o th e r in d u s tria l o r in te lle c tu a l p ro p e rt y rig h ts . s e m te c h a s s u m e s n o re s p o n s ib ility o r lia b ility w h a ts o e v e r fo r a n y f a ilu re o r u n e x p e c te d o p e ra tio n re s u ltin g fro m m is u s e , n e g le c t im p ro p e r in s ta lla tio n , re p a ir o r im p ro p e r h a n d lin g o r u n u s u a l p h y s ic a l o r e le c tric a l s tre s s in c lu d in g , b u t n o t lim ite d to , e x p o s u re to p a ra m e te rs b e y o n d th e s p e c ifie d m a x im u m ra tin g s o r o p e ra tio n o u ts id e th e s p e c ifie d ra n g e . s e m t e c h p r o d u c t s a r e n o t d e s ig n e d , in t e n d e d , a u t h o r iz e d o r w a r r a n t e d t o b e s u it a b l e f o r u s e in l if e -s u p p o r t a p p l ic a t io n s , d e v ic e s o r s y s t e m s o r o t h e r c r it ic a l a p p l ic a t io n s . in c l u s io n o f s e m t e c h p r o d u c t s in s u c h a p p l ic a t io n s is u n d e r s t o o d t o b e u n d e r t a k e n s o l e l y a t t h e c u s t o m e r s o w n r is k . s h o u ld a c u s to m e r p u rc h a s e o r u s e s e m te c h p ro d u c ts fo r a n y s u c h u n a u th o riz e d a p p lic a tio n , th e c u s to m e r s h a ll in d e m n ify a n d h o ld s e m te c h a n d its o ffic e rs , e m p lo y e e s , s u b s id ia rie s , a ffilia te s , a n d d is trib u to rs h a r m le s s a g a in s t a ll c la im s , c o s ts d a m a g e s a n d a tto rn e y fe e s w h ic h c o u ld a ris e . a ll re fe re n c e d b ra n d s , p ro d u c t n a m e s , s e rv ic e n a m e s a n d tra d e m a rk s a re th e p ro p e rty o f t h e ir re s p e c tiv e o w n e rs . semtech corporation advanced communications & sensi ng products contact information e-mail: sales@semtech.comacsupport@semtech.cominter net: http://www.semtech.com usa 200 flynn road, camarillo, ca 93012-8790. tel: +1 805 498 2111 fax: +1 805 498 3804 far east 12f, no. 89 sec. 5, nanking e. road, taipei, 105, t wn, r.o.c. tel: +886 2 2748 3380 fax: +886 2 2748 3390 europe semtech ltd., units 2 & 3, park court, premier way, abbey park industrial estate, romsey, hampshire, s o51 9dn. tel: +44 (0)1794 527 600 fax: +44 (0)1794 527 601 revision v1.7/october 2010 ?2010 semtech corp.

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