`
`PER EO RAR
`
`CYPRESS SEMICONDUCTOR CORPORATION
`Internal Correspondence
`
`WW: 0949
`
`Date: 04/42/2009
`To: Michele Paparella (MPU)
`Author: Volodymyr Burkovskyy (bypo_ukr), Oleksandr Karpin (kool_ukr)
`Author File#: VICK#331
`Subject: Water Rejection for TMA300
`Category: CapSense, ITO, TMA300, Waterproof
`Distribution:
`fFO_APPS, ELG, IXP, YHW, DTY, TXP, FDU, SYK, TMD, PPKS,
`KOOL_UKR, MAPS_UKR, AKON_UKR, VASM_UKR, KULT_UKR
`
`PURPOSE
`
`
` perforce: §
`DESCRIPTION
`
`TMA300 Waterproof Problem
`Getting of water drops on the panel causes the RawData signals decreasing on wet
`sensors (VICKSS08).
`Hf signal decreasing is in the range of NoiseThreshold then Baseline
`
`signal slowly drops (see Figure 1 - a). HW signal decreasing is more then NoiseThreshold
`range then the Baselineis reinifialized by RAW data signal {see Figure 1 ~ b).
`
`Figure 1. Water Influence on RAW Data and Baseline Behavior
`
`(a)
`
`{b
`
`Page 1 of 7
`
`
`
`This behavior results in incorrect touch position calculation (er even false touch detection}
`after water on the panel clear up.
`
`ITMA200 Water Rejection Solution
`The simple water rejection solution may be based on NOT performing of the baseline
`reinitializing if Raw data is lower baseline by more than NoiseThreshold value. This allows
`disabling the baseline droppingafter the panel drying up (see Figure 2).
`
`Figure 2. Baseline Function Behavior without Reinitializing
`
`For some sensors the water may cause a RAWsignals decreasing is in the range of
`NoiseThreshold.
`in this case the Baseline signa! slowly drops. But after panel drying up
`the RAW data will be in NoiseThreshold range and baseline mechanism autornatically
`solves this problem.
`
`Solution Problem or Start-Up Issue
`if some capacitive object (finger, palm) was present on touchscreen during start-up
`(signals initialization) then RawData drops below Baseline at a value of touch response
`when finger releases the panel (see Figure 3)
`
`Figure 3 Start-Up Issue with Finger/Palm Presented on the Panel during initialization
`
`Page 2 of 7
`
`
`
`in TMA3G0 UMthe baseline reset was special entered to avoid this prablem with baselines
`when touch was at a panel during start up. It resets Baseline to a new RawData level if
`RawData drops below the Baseline at a value higher than NoiseThreshold (see Figure 4).
`
`Figure 4. Baseline Reset in Current TMA300 UM (Panel was Touched on Start-Up)
`
`
`
`ane Rawiate ©
`nee
`
`(Baseline.ee-
`Date
`Figure 5. Differences in amplitudes
`
`Presence of fingers (palm) on the panel during initialization cause RawData falling below
`Baseline when panel gets free from fingers. The value of RawData changes is much
`higher than threshold and baselines are reset in standard UM realization.
`
`Assumption’ Touch response must be higher than water influence on RAW data
`{see Figure 5). in this case it's possible separate touch on start up and waterinfluence.
`
`Page 3 of 7
`
`
`
`Stari-Up Issue Solution: To separate fingers presence on the start up from water drops
`influence it's proposed reset baselines for all sensors with RawDatalower than baselineif
`
`at least one signal exceeded specified NegativeWaterThreshold level.
`
`
`
`in addition (fo prevent problems from slow finger/paim touch up) after
`NegativeWaterThreshold condition detectionit is proposed fo continue reset baselines for.
`all sensors with RawData lower than baseline whileat least one such signal exist after last
`
`
`
`panel scanning.
`
`perform Baseline reinifializing
`Water Rejection Solution: It's proposed don’t
`if Raw data
`
`Grops below the Baseline by more than NoiseThreshold value but don't exceed specific
`
`NegativeWaterThreshold level.
`
`The flowchart for proposed water rejection method with start-up issue solution is show
`below:
`
`Page 4 af 7
`
`
`
`Figure 6. Flowchart for Proposed Water Rejection Method with Start-Up issue Solution
`Siete)‘
`,
`
`oY atoo + NoizeThreshold
`CapSense inidialization
`{. Bsidets Baseiines}
`AOONRARARRERIRIRANEDOORIOODOINNIIIIBaseliog
`fiuisie Besaiines}
`&>
`oe eer ee ee ee ee» NineThreshott
`
`
`
`<>
`
`BsLixistsSesatinall?
` fDost ingisive Basolnall
`
`
`
`
`nea
`
`CapSense scanning of
`all sensors
` i
`
`_+
`
`
`> CheckStartUpTouch}
`
`
`UpcateRaseline()
`
`N
`poeererneene
`¢
`
`i
`:
`
`.
`
`
`
`
`'}|}}!||
`
`prenrrressscessses
`
`\
`y
`t
`
`3t
`
`a
`:
`‘
`y
`y
`:
`;
`
`
`
`hs
`Rares
`.
`ae
`vg ca
`-NolseThrashuld<>Rawliaiait<*+HoigeThimstotd >
`_
`wD
`en,
`en
`a
`é
`4
`=
`=fag
`
`_
`
`,4¥
`
`/
`tennantnate:
`i
`t
`o
`:
`:
`
`‘
`Update Basetinally
`a
`avin
`
`~
`a
`tf
`ii
`+
`y
`.
`v
`i
`wet [Ss
`an
`:
`
`
`
`{
`:
`:
`Ca
`
`
`
`‘
`:
`i
`
`tcitett
`.
`
`
`Note that yellow filed elements should be added to exist UM routine.
`
`Page 5 of 7
`
`
`
`
`
`itis detected then with scanningfrequency increasing for TMA120/TMA300 the touch
`response is increased and water influence is decreased.
`
`This feature should be used to make maximum difference between touch signal and signa!
`caused by water.
`
`There is not significant reaction on water drops - close to 5-15%to signal on touch when
`scanning frequency is high (TMA300 close to 7%, TMA120 ~15% with TSCAN=83.3us,
`
`Precharge frequency 0.96MHz; see memo VICKX208, Table 1, Figure 4)~ see Figure 7-8.
`
`
`Figure 7 Small Water Influence using High Scanning Frequency
`
`
`
`
` Oeminis
`
`Figure 8 Signals Reaction on Water Drops for DVK CY3290 with Different Prescaler
`Values
`x. 128 Subsonv:2; Cycles:8: 5V |
`
`rescaler. 34,Subconv:2. Cycles: 8, 6V
`
`t
`
`Page 6 of 7
`
`
`
`CONCLUSION
`
`1. Proposed water rejection method requires touch response signal higher than water
`influence or RAW data. The practical tests show good behavior of proposed
`method. The video and codes are located on perforce:
`.
`
`
`
`
`2. By using proposed method it's impossible fo solve start-up issue and waterproof
`togetherif the finger touch respanseIs close to signal changing that Is caused by
`water drop.
`
`3. The precharge frequency increasing result in negative signals reaction decreasing
`on water drops. So more preferred is to work on higher precharge frequencies.
`
`4. Wetfingers tracking result in touch active area increasing (See Figure 8). Also the
`several
`local maximum occurred and it is possible to detect several fingera by
`standard routine. For solve this issues the special algorithms should be used. The
`next actions will be devoted to wetfingers tracking solution for TMA300.
`
`Page 7 of 7
`
`
`
` =e 7CYPRESS
`
`
`PER FORM
`
`CYPRESS SEMICONDUCTOR CORPORATION
`internal Correspondence
`
`WW: 0924
`
`Date: 5/21/2009
`To: Michele Paparella (MPU)
`Author: VICK, Oleksandr Karpin (KOOL_UKR)}, Taras Kulyk (KULT_UKR)
`Author File#: VICK#207
`Subject: Waterproof for Krypton/TST200/TMG200
`Category: CapSense, ITO, Shield, Krypton, TST200, TMG200, Waterproof
`Nistribution: FFO_ALL, GOKK, VUD, OID, RXE ELG, SNV, XP, YHW, OLR, OFL, DTV,
`SXF, TXP, RB, RMG, YOM, VICD, PKSO_UKR
`
`
`Purpose
`
`This memo
`continuous VICKSI?F and
`represent
`the waterproof
`realization
`in
`Kryptan/TST200/TMG200. propeedssolution is not universal but can show good results for
`some designs. The universal waterproof realization requires silicon changes according to
`
`
`
`Summary of Results
`
`1. Waterproof realization basic concepts:
`
`in new realization to provide water influence
`» Shield signal must be present
`elimination. The idea and basic concepts of
`shield electrode using for
`touchscreen should be taken from memo HMTTMPS8oo..
`
`* The shield signal
`in Krypton/TST200/TMG200 must be carrying to all non-
`scanned lines. For this purpose the parasitic capacitance between Shield layer
`and sensors can be used. If shield layer is absent or capacitance between shield
`jayer and sensors is too big then the adding additional extemal N-capacitors
`beiween shield signal and [TO lines must be used.
`
`2. Waterproof adding guide:
`» Use parasitic capacitance between shield layer and sensors or additional
`external N-capacitors befween shield signal and ITO lines for shield signal
`carrying,
`» Connect shield electrode as described in memo VICKS177:
`
`o Use P1[2] for shield electrode out.
`© Change precharge voltage from 1V fo 1.2V (CS_CR3and CMP_MUX}
`© Change shield signal level (on Portt) to 1.8V GO_CFG, |O_CFG2).
`
`Page 1 of 22
`
`
`
`» Implement “Waterproof scanning method” that connects all non-scanned
`sensors Hi-Z Analog. Note that “Standard scanning method” connects non-
`scanned sensors to GND.
`.
`
`‘*"
`
`if RAW signalis equal or close to zero far “Waterproof scanning method” then
`this shows the “strong” shield effect (see memos VICKS417 and APBSSET?FD.
`To solve this problem the shield signal level should be decreased by external
`resistorsor capacitors divider (see Figure 1). ideal case ~ precharge voltage
`is equal to shield electrode valtage.
`
`Figure 1. Shield Electrode with LDO Voltage Decreasing by Divider
`
`
`
`* Select PWM or PRS CSD configurations for “Waterproof scanning method”
`{according to SNR, RF-immunity etc.) ~ see test results of memo below.
`
`3.
`
`is possible to use combination of these “Waterproof scanning method” and
`It
`
`
`‘Standard scanning method” — similar to TOPSS4. “Standard scanning method” is
`
`used for touch position calculation without water. Combination of methods allows
`detecting water drops. “Water-proof scanning method” is used for touch position
`calculation with water,
`
`Figure 2, Combination of Standard and Waterproof Methods Using
`Standard Scanning Method
`Waterproof Scanning Method
`\N
`
`
`
`WS«
`
`oS
`
`.
`
`Page 2 of 22
`
`
`
`
`
`Such technique implements waterproof sensing with RF immunity of standard
`method. But if requires 2 times longer scanning time, 2 times more RAM memoryfor
`RAW data and baselines and more complicated post processing.
`
`For faster scanning time it is possible to scan by the “Standard scanning method”the
`whole panel. If the touch/water is detected then it is needed to check on water by
`
`“Waterproof scanning method" for only one tine with local maxima. With water the
`
`“Waterproof scanning method” for the whole panel must be used and baselines for
`“Standard scanning method” must be not updated (the possible algorithm of this
`method is shown in appendix of this memo).
`
`4. “Water-proof scanning method" with PRS CSD configuration and prescaller value 4
`gives better results for HTC NBRAO3 panel than “Water-proof scanning method" with
`PWM (more detailed information about
`this panel
`is
`located on perforce
`
`HappapsowiTOsFrojactsATGNBRAQSTST) and memo VICKSi?2). Note that
`optimal prescaler value (or precharge frequency) for standard scanning method is 16
`and for waterproof scanning method with PWMis 8.
`
`The basic projects for this memowith water-proof scanning method based on PRS and
`PWM for Krypton/TST200/TMG200 are located on perforce:
`
`
`
`Page 3 of 22
`
`
`
`Experimental Setup
`
`The basic schematic af Krypton/TST200/TMG200 Waterproof Solution with [TO shield layer
`is shown on Figure 3:
`
`Figure 3, The Basic Schematic of Krypton/TST200/TMG200 Waterproof with Shield Layer
`
`Scanning PSeC TSTTMG200/Krypton
`
`orttnnnannnninna
`
`The basic schematic of waterproofrealization with external capacitors using for
`Krypton/TST200/TMG200 is shown on Figure 4:
`
`Figure 4. The Basic Schematic of Krypton/TST200/TMG200 Waterproof with External
`Capacitors
`
`Scanning PSoC TSTITMG200/Kryptan
`
`RC
`
`BRIDGE
`Ved
`
`
`Page 4 of 22
`
`
`
`The test setup of board with TMG200 module was built based on HTC NBRAOS panel (see
`Figure 5). Shield electrode is bullf in the (TO pane! below the sensors layers and connected
`fo pin P12.
`
`Figure §. Demo Board Photo
`
`“On Figure 6 is shown the scheme of connection Shield Electrode pin.
`choosing required pin in Device editor.
`
`it is preformed by
`
`Figure §. Shield Electrode Pin Selection in PSoC Designer
`3
`Ac
`Name
`
`
`
` Shield electrada pin.
`
`
`
`
`
`
`
` CAN
`
` TABFikesCon
`Rawliate Je
`
`
`
`
`
`oy£
`
`__ Rabie,
`aid? 18
`
`Actor Mistance Threshold18
`Acie Distanee Thee 10
`
`
`
`Page 5 af 22
`
`
`
`Configuration Schemes
`
`it is praposed such configuration schemes for tests:
`
`“Standard scanning scheme” - is current CSO/TST/TMG user modules realization with
`connection of all non-scanned sensors to GND. To minimize mismatch between shield
`signal and sensors precharge voltages the shield voliage is decreased to 1.8V and
`precharge voltage was increased fo 1.2V using corresponding registers (see memo
`errr
`aye
`a
`ne
`VEORS TS) (see Figure 7).
`
`
`Figure 7. Shield and Precharge Voliages for Used Standard Scanning
`
`
`
`
`
`Precharge voltage 1.2Y
`cee Shield signal valtage 1.6¥
`
`“Water-proof scanning scheme”. As Krypton/TST200/TMG200 devices don’t allow to output
`shieid signal to various pins, so to carry the shield signal the all non-scanned sensors is set
`fa Hi-Z Analog mode. As result some shield signal was present on the non-scanned pins
`{see Figure 8).
`
`Figure 8. Waterproof Scanning. Shield Signal Carrying
`
`«mee Yaxis searnning signals
`vom X axis seanning signals
`
`Page 6 of 22
`
`
`
`
`
`Note 4 that if shield layer is absent or capacitance betweenshield layer and sensors {s too
`big then the adding additional external N-capacitors between shield signal and ITO lines .
`
`must be used.
`
`Note 2 that If RAW signalis equal orclase fo zero then this shows the “strong” shield effect
`
`(see memos VICKET(? and VECKS(77). For solve this problem the shield signal level
`
`
`should be decreased by external resistors or capacitors divider (see Figure 9-10).
`
`Figure 9. Shield and Precharge Voltages
`
`pentane Precharge voltage 7.2V
`
`= Shield signal voltage 1.24¥
`
`
`Figure 10. Scanned, Shield and Carried Signals for Waterproof Scanning
`
`
`
`Shield’ Scanning signal
`
`
`
`Shield signal (1294
`
`Note 3 that PWM and PRS CSD configurations can be used with waterproof scanning.
`
`Page 7 of 22
`
`
`
`Test Results
`
`Table 1.
`
`Test Results of Differant Scann
`
`ing
`
`Schames
`
`be
`
`
`
`banaaaaameennnrnnennens
`
`§
`
`Pe
`is
`orn to
`§
`
`SS
`
`at
`
`inal
`
`Water-
`prow
`
`i?&GEee)Ao,iBeots
`SeeBeSn=OoAvwotoWhegosAGfaBtpeBe
`teEee.wet
`
`
`esi
`teaseii }
`
`
`
`preerereeerncenecacssestseeiitannmnnnnnenserenceseeasettnasnannenepmemncrnnnenreneergenrtepfgrreennnneenecnonanegnannnanssssnansstettyttiMyeeowt4iiSeGeEeii“omgfmoaoemr{teeREgeTeniI.iBwBm7GregSS86gai{A2}owBr!SsoioeiMotes2ATOuiatyamae
`timSuaa
`!ia2Djtpeecegeneecap
`Seawo)Se=x=io}~2.BS|
`S82+Sing
`bes=o.
`
`iHSs8SBefeBacthaemp>EeTHeemBleevetPLGewrBgmaei
`
`vo”awn2,gbeeSTMm
`g3ee5Peohvey3:+aig=og_£othe,Bos
`Bing¢‘DEpeoBeGEeGBs
`
`194ShxSsaoe=AasFtfaeadttd |eoeoeFylatGo.ohmemt
`iiB@babes|vs“saba=mannerree
`°Bo8#12Reee
`if,UGSb,ii
` ;
`
`4
`
`benennehenrcwtbenncnch
`
`i|
`
`Page § of 22
`
`
`
`
`
`
`
`
`Waterproof Tests
`
`The waterproof scanning method shows small positive reaction on the water drops and
`significant increasing of signal value for fouch in wet panel place — se Figure 11.
`
`Figure 11. Reaction on the Water of Waterproof Scanning Method (PRS 8bit, prescaler4)}
`
`The additional problem is that signal value for touch in wet panel place depends on water
`volume. These negative effects complicate the threshold technique realization, especially
`for two touches detection (as false touches may be occurred for touches in wef panel
`places aspanel sensitivity significantly increased).
`
`Page $ of 22
`
`
`
`Linearity Tests
`
`
`
`Linearity tests are performed by the finger with Standard scanning configuration
`(prescaler 16) and waterproof scanning with PRS, prescaler 4.
`Figure 12. Linearity Test
`STeerietrtSIaRRRNRERASRSSESEERR VEYAYEA
`t:
`Waterproof Scanning, PRS,
`Standard Scanning:
`Prescaler=4;
`Prescaler=16
`
`t ;
`
`t
`
`peneconreannnnanamananaaaaiananaaasgatnnnnererrrriweanaanentcnr
`Tauzh@enangraunded Ringer
`
`_Wett panel
`
`
`
`Note that the bad linearity mostly is caused by nose value increasing of waterproof
`scanning method with touch (see Figure13) and enlarging of the touch area with water
`
`present on the panel surface. Linearity of this panel with TST110 was shown in V :
`
`Figure 13. Noise increasing for Waterproof Sensing with Non-GND Object
`Standard Scanning
`Waterproof Scanning
`
`Touch by gecunded finger
`
`Touch hy Hen-praundad fingat
`
`Toush hy groundedfinger
`
`
`
`fiatatBaseline
`
`Page iC of 22
`
`
`
`RF immunity Tests
`
`for
`Results of RF immunity for standard scanning schemes are shown on Figure 14,
`waterproof scanning scheme with PWM - on Figure 12 and for waterproof scanning scheme
`with PRS - on Figures 13-14.
`
`Figure 11. RF immunity Test of Standard Scanning (prascaler = 8)
`
`Benet
`Soon3.
`
`Ten tees
`Rew Sowt §
`
`Fromehaed
`Eee
`+ RRL
`Gastar 2.
`++ Ropehecs
`Reseed
`ves Bente £
`Beasec 8
`+ Borate F
`
`Figure 12. RF immunity test of Waterproof Scanning with PWM (prescaler = 8)
`
`++ ROPRT
`Bassins: }
`
`Page 11 of 22
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Figure 13. RF immunity Test of Waterproof Scanning with PRS (PRS=8bit, prescaler = 2)
`
`Gente oF
`Saratn 82
`BNE,
`
`weeRaEES
`Reedy:
`we Sh Saba
`settee St?
`
`+ Sater
`PONDS
`SNSRovans &
`
`“Beanie tt
`URED
`metete t
`“eesteig 3a
`Soone th
`Basan $5
`shes
`+ Ree
`
`SARE SR ORR ERERPO ONS
`
`ene
`
`A
`
`.
`
`oo
`
`aectecncecjewnanaa
`
`ones
`
`Page 12 of 22
`
`
`
`The RF-
`balow
`
`RTHTIUN
`
`ty fest ons
`
`imp
`
`le mobile phone putted on the pane!
`
`iS
`
`shown on the }
`
`igure
`
`Figure 15. RF Immunity Test on Mobile Phone of Different Schemes
`
`Standart scann
`
`ith PWM
`ing wi
`
`Waterproof scanning PWM (Prescaler8)
`
`¥
`
`Waterproof scann
`
`{PRS 8b
`ing
`{as precharge source,
`prescaler 4)
`
`Water-proof scann
`
`i
`(PRS 8b
`tas precharge source,
`ing
`prescaler 2}
`
`
`
`Page 130
`
`‘hee
`
`mM
`
`OM
`
`
`
`
`
`Conclusion
`
`2.
`
`1. Krypton CSD/TST200/TMG200 “Standard Scanning Scheme” (non-scanned sensors
`are grounded) and “Waterproof Scanning Scheme* (non-scanned sensors are set to
`Hi-Z Analog and shield signal is carried fo them via capacitance — parasitic between
`shield and sensors layers or external capacitors) are considered in this memo.
`lf shield layer is absent or capacitance between shield layer and sensors is too big
`then the adding additional external N-capacitors between shield signal and [TO lines
`must be used. External capacitors can provide more predict
`results as their
`capacitance values can be appropriately defined for specific scanning parameters.
`3. For used demoboard the “Standard Scanning Scherne” based on prescaler value 16
`and "Waterproof Scanning Scheme” based on PRS with 4 prescaler value show the
`best results.
`
`4. Best “Standard Scanning Scheme” and “Waterproof Scanning Scheme” show the
`similar (see Table 1)
`> SNR
`» Negative Proximity Effect Value
`5. “Waterproof Scanning Scheme” drawbacks are:
`Significant increasing of signal value for touch in wet panel place
`Worse linearily
`Noise increasing with finger touch
`Worse RF-Immunity
`Signal increasing in positive direction for GSM frequency range noise
`8. “Standard Scanning Scheme’ drawbacks is:
`» No waterproof
`the fastest way of checking or
`is
`». Simple
`“Waterproof Scanning Scheme’
`demonstration to customer the possible Krypton CSD/TST200/TMG200 waterproof
`solution,
`5. The best solution for Krypton without silicon changes (according to VECRS$3)
`should be combination of these “Waterproof scanning method". and “Standard
`scanning method” ~ similar fo TOPS34.
`“Standard scanning method” is used for
`
`touch position calculation without water. Combination of methods allows detecting
`water drops. “Water-proof scanning method” is used for fouch position calculation
`with water.
`.
`
`vw
`
`wwwy
`
`?. For faster scanning timeif is possible fo scan by the “Standard scanning methoa"the
`whole panel.
`if the touch/water is detected then it is needed to check on water by
`“Waterproof scanning method” for only one fine with local maxima. With water the
`“Waterproof scanning method” for the whole panel must be used tthe possible
`algorithm of this method is shown In appendix of this merno).
`8. The results of this memo should be verified on different designs.
`
`Page 14 of 22
`
`
`
`Appendix 1: Combination of “Waterproof” and “Standard” Scanning
`Methods Basic Aigorithm
`enone
`—
`
`WP ~— Water-proofCstat>
`ST ~ Standard
`
`
`- Standart scanning
`CSOMSTAMGS
`
`CapSanse initialization
`
`
`
`
`
`Waterproof scanning for
`T local maxima sensar
`
`
`
`
`|
`
`
`
`
`is tauch WP _
`
`No (is Water}
`
`Yes (Is Touch)
`
`
`
`
`Resulis output according
`fo standard scanning
`
`
`SanEEnenee
`
`reo
`
`
`
`
`
`
`
`
`
`
`Water-proof scanning of
`whole panel
`
`
`
`or
`
`
`
`og Touch WP
`iy Tauch ST a_wen
`
`
`
`Resulis ouiput according
`to standard scanning
`
`
`Results output according
`to water-proof scanning
`
`Standard scanning of
`whole panel
`
`i
`
`Page 15 of 22
`
`
`
`Appendix 2: FingerThreshold Adaptive Adjustment Algorithm
`
`As was shown on the Figure 11 the significant increasing of signal value for touch in wet
`panel place exists. Also the signal value for touch in wet pane! place depends on water
`volume, These negative effects complicate the threshald technique realization, especially
`for two touches detection (as false touches may be occurred for touches in wet panel
`places as pane! sensitivity significantly increased). For solve these problems the adaptive
`Finger Threshold Adjustment Algorithm is proposed.
`
`The idea of this algorithm is to define significant increasing of sensitivity and recalculate
`finger threshold based on large RAW signals values. Such adaptive Finger Threshold
`Adjustment Algorithm should be used if more then one fingers are detected (as ane of them
`may be false detected touch).
`
`The place of adaptive Finger Threshold Adjustment Algorithm in post-processing is shown
`an the figure below andits realization is shown in Appendix 3.
`
`Page 16 of 22
`
`
`
`
`
`Sat shield electrode (1.8V ar 1.24} and
`
`precharge (1.2) valisges
`44
`
`
`
`beeeereres
`
`sensors dive modes ta Hi
`
`
`
`
`iritiatze sensors
`
`atten Sean sensor
` Set HiZ drive mode for already scanned sensor
`
`
`
`
`
`No
`
`Yes
`
`cot<aSANGINGATEscanned>oeoN
`
`ieneeecetenaneneneteny pon
`
`{{}
`
`:
`iSwitchte next sensor
`
`oenennnnnes
`
`|
`
`Gentroid caiculati
`
`——
`
`ALae
`a
`—eh than 1 fagers are detectedNo
`
`
`
`Yes
`
`
`
` FingarThreshold adjustment
`Z
`
`Canad calculation
`t8
`
`Restore defaudt Fingerhrestatd
` i
`
`Dale transmission vie communioaion iyvera|
`,
`
`
`
`Page 17 of 22
`
`
`
`Sample of Code
`
`
`
`yet
`
`vi
`
`ay
`
`IG CFG2
`iG CFG
`te
`
`void vwSet AllPinsHiz (3
`{
`
`Ro
`
`te
`
`4x
`
`Appendix
`
`3
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`BYTE bF
`
`a
`
`ndMaxSensorindex (BYTE bxY}
`
`we
`
`ACER
`
`cala
`
`i?
`—_voO
`
`eeeamm
`
`tnt
`
`Cs
`
`
`
`
`
`
`
`
`
`
`
`p~
`OR
`
`foot
`
`
`
` 4aeaHS4g»xGe4@Big=eG j
`
`ial
`
`Lee
`
`Baselines {}
`
`33i3
`
`3:
`
`34a434
`
`i
`
`seis gh
`
`<TMS SLIDER XE COUNT
`
`&
`
`$+}
`
`Re
`
`vers
`
`S{L=TMG SLIDER X COUNT
`
`7
`
`A<TMG PotalSenserCeaunt
`
`?
`
`a+)
`
`an
`
`neh*
`
`nes
`q
`23ATS
`
`*
`
`est
`
`at
`
`zi
`ET LON
`a
`
`hbteOE
`
`4ofbo
`
`:
`
`Ma
`3
`tee Ne
`
`Page 20 of 22
`
`Pp
`
`Pr
`
`yg
`im
`
`fheEh
`
`“ay
`
`us
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`aoosoR
`
`one)
`tod
`
`8ortnyodfaoaSa]Ga%éSgMHa“54ya“4¥ay:bdfyortot2of‘™
`;iBiaR$2s}A“8e4~
`Hoa.2wa
`rd™Iwe%ortigwe4soea~~«apdonetm8nebi
`bdwn4K+aeoct$Es4saowea4re!
`
`
`
`pa.aea>mo5&wetwe
`
`ta
`
`
`
`¢qooN
`
`f
`
`
`
` iNonsit2ooy.Bsaae°bos$55,2fryEhmspep):Sa
`
`yyas,
`
`
`
`
`
`
`
`
`
`
`ia
`
`sr {
`
`=g
`
`i
`
`EMGSLIDER X COUNT
`
`a.
`
`<IMGTotalsSenserCount
`
`x
`
`++}
`
`ay
`PMS
`
`.,
`
`2
`
`B
`
`PThreshaldad
`
`jus
`
`thant
`
`ote
`
`WHA
`MM
`
`osy SheDS
`
`sete
`oexy$4ft
`
`AQYia sk
`
`sgtae
`
`End of Document.
`
`tsanNNwfewsD..
`
`os
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`ieee
`—_"
`SRRERGOONOUNOINOOON eACT
`
`y CYPRESS
`
`
`CYPRESS SEMICONDUCTOR CORPORATION
`infernal Correspondence
`
`WW: 0563
`
`1/12/2009
`Date:
`To: Michele Paparelia (MPU}
`Author: Oleksandr Karpin, Vasyl Mandziy
`Author File#: VICK#123
`Methods of Error Detection for Single-Touch
`Touchscreen/Touchpad Designs
`Category: CapSense, ITO, Touchscreen
`Distribution: TOALL, GOKK, VUD, O1D, RXE ELG, SNV, IXP, YHW, OLR,
`DPL, DTV, SXF, TXP, RD, RMG, YOM, VICD, PKSO_UKR
`a
`
`Subject:
`
`Purpose
`
`in this memo methods for paim/hand touch detection, two or more fingers detection and
`salt water
`identification during finger
`touch as error
`states
`for
`single-fouch
`touchscreen/touchpad designs are developed.
`
`Summary of Results
`
`4)
`
`2)
`
`The “Total Mass Meter” method was modified to reject palms, faces touches,
`two or more fingers touches, and saif water drop during finger touch
`identification as an error states and that does not have any absolute values
`as itis based on maximum value of difference signals.
`
`Method of two or more touches defection as error state for single-touch
`touchscreen/touchpad designs based on analyzing a signals shape was
`developed.
`
`Method for single-touch waterproof touchscreen/touchpad designs with stable
`painvhand touch detection,
`two or more fingers detection and salt water
`identification during finger touch as error states based an modified *Total
`Mass Meter" algorithm and based an analyzing a signals shape plus shield
`electrode using was proposed.
`
`Page tof 7
`
`
`
`Problems Overview
`
`When salt or not salt water Is dropped on the panel, signals increase to the level as
`finger touch (see Figure 1).
`
`
`
`Figure 1 Water Applied Without Shield Electrode Using
`
`Shield electrodes (are driven in the same phase with sensing electrode) were used for
`unscanned lines for water capacitive sensors protection (see AN2398) when salt or not
`salt water drop is putting on the panel (see Figure 2).
`
`
`
`
`
`
`
`EeyyWh
`Uhte Le
`
`
`hie
`
`
`
`
`
`i
`
`
`
`
`Figure 2 Water Applied When Shield Electrode is Using (No Touch Detected;
`The user actions with salt water produces error finger positions detection (see Figure
`3}.
`
`Figura 3 System Detects Faise Touch
`
`Page 2 of 7
`
`
`
`Paim/hand,
`
`two or more fingers touches must produce error states for single-touch
`
`Figure 4 Paim/Hand, Two or More Fingers Touches Must Produce Error States
`
`The “Total Mass Meter” aigorithm is used for rejecting false touches, paims, faces, water and
`other conditions (see Figure 5). This meter is used to determine whether or not to calculate the
`centroid. If the value of sum (diffdata) is too iow, the touch is considered noise and if this value
`is foo high, the touchis considered as an error siate:
`
`fouchscreen/touchpad designs (see Figure 4).
`
`
`isum (dijfdata} > massthreshold => errer
`
`
`
`Figure 5 Signals for the Case of Paim, Hand, Face Touches, or Salt Water with Finger
`Touch
`
`The “Total Mass Meter” algorithm requires setting an absolute value of mass_threshold.
`Such algorithm is not stable as depend on absolute value.
`Ht has problems with:
`incorrect user behaviors if RAW signals are weak or panel cells are big, correct user
`behaviors if RAW signals are strang (see Figure 8).
`
`Page 3 of 7
`
`
`
`
` adiedt clon.
`
`
`
`
`
`
`
`
`Figure6 Issues when “Total Mass Meter" Algorithm Is Used
`
`The problems of absolute value defining for “Total Mass Meter” algorithm are more
`significant as touchscreens use high resistance materials and signals on the beginning
`and on the end of lines can be different (see Figure 7).
`
`
`
`Figure 7 issues when “Total Mass Meter” Algorithm is Used for Touchscreens
`
`Typical single-touch applications (such as kiosks and gaming, automotive control
`panels, “wipe-clean” applications such as medical equipment, cash machines and other
`secure applications, ATMs, public access systerns, kitchen and bathroom applications,
`automatic faucets, dish and clothes washing machines} as rule require a big SNR and
`pane! size, it means that these applications have all of these problems.
`
`New Methods for Error Detection
`
`System does not have any absolute values for incorrect unpredictable user behaviors
`detection. Modification of the “Total Mass Meter’ method to remove dependence on
`absolute value is proposed.
`It should depend on maximal value of RAW difference
`signals max(difference signal}.
`ff
`the sum of difference signals is bigger
`then
`k*maxidifference signal) then it should be identified as error state (see Figure 8) k
`depends on structure (e.g. diamonds pitch size} and overlay dielectric constant and
`thickness.
`
`if surn (diff data) > k*max(difference signal} => error, where k > 4
`
`
`
`WEENay
`
`Figure & Error Touches Detection based on max(oifference signal}
`System must have a signals shape analyzing methods for detect problematic of
`incorrect user actions including iwo or more fingers touches with weak RAW signals
`
`isee Figure 8).
`
`Figure 9 Two Fingers Touches with Weak RAW Signals
`A difference RAW signals shape is analyzed: the difference signals from maximum
`signal position must go down fo both sides to end of pane! if signal does not less then
`noise threshold value (see Figure 10). If this situation is incorrect then f means several
`local maximums available and then two or more fingers and then error state for single
`touch devices (see script below).
`
`Page 5 af 7
`
`
`
`
`
`
`
`
`
`CASWAN
`ESSEAWN
`
`oy
`
`;e
`
`n
`
`reg ed
`
`t4
`
`aE
`
`Figure 10 Error Touches Detection based on Surface Analyzing
`
`=
`e
`*
`*
`*
`.
`*
`@
`*
`*
`e
`.
`»
`
`Find Position of Max Value (Pos),
`of (Pas0} {
`fer (i=Pos; bth i-) |
`if (Stgnalfi-l | > NoiseThreshold)
`ifignalli-d}>Sionalit} => Error
`
`:
`
`;
`if{Pos < ManxPas-3} 4
`for G=Pos; i<MaxPos-}:it+) {
`if (Stenallt+t] > NoiseThreshold)y
`if (Sigealfit+-1]>Signal]i]) => Error
`
`3
`»
`
`The result of this algorithm is shown on Figure 10 (see error messages}.
`Methodof using:
`*
`shield electrode plus
`*
`modified “Total Mass Meter’ algorithm pfus
`*
`signals shape analyzing method
`
`Page € of 7
`
`
`
`for single-touch waterproof touchscreen/touchpad designs with stable: palm/hand touch
`detection, two or more fingers detection and salt water identification during finger touch
`as error states is proposed too (see Figure 11).
`
`
`
`SOSeni
`
`
`
`Wister
`
`
`
`VB.
` %Bo
`
`
`isait}
`
`Figure 71 Results of Using Shieid Electrode Plus Modified “Total Mass Meter” Algorithm
`Plus Signals Shape Analyzing
`
`two or more fingers
`Using the proposed algorithms allow detect palm/hand touch,
`touches and salt water during finger
`touch as error states for
`single-fouch
`touchscreen/touchpad designs.
`
`Conclusion
`
`1. The proposed methods allow creating stable Cypress end solutions for single-
`touch waterproof touchscreen/touchpad designs (e.g. automotive contro! panels,
`kiosks and gaming, "wipe-ciean” applications such as medical equipment, ATMs,
`public access systems, white goods).
`
`2. Developed methods plus shield electrode using for single-touch waterproof
`touchscreen/touchpad designs allow:
`
`®
`
`*
`
`e
`
`detect paim/nandtouch and inform host about error states:
`
`touches
`two or more
`identify
`touchscreen/touchpad designs:
`
`as
`
`error
`
`states
`
`for
`
`single-touch
`
`detect salt water drop during finger fouch as error state.
`
`Page f af F
`
`
`
`
`HARASSED.ah=
`
`
`RN. ="
`
`FER PRA
`
`CYPRESSSEMICONDUCTOR CORPORATION
`internal Correspondence
`
`WW: 0938
`
`Date: 9/14/2009
`Yo: Michele Paparella (MPU)
`Author: TOP({Tony Park}
`Author File#: TOP#43
`Subject: Water tolerant sensing of Mutual vs SelfCap in Indium
`Category: Touch screen
`Distribution:
`ite_apps.vud
`
`SUMMARY
`The purpose of this memo shows test result of water tolerant sensing using mutual and selfcap in
`Indium. The testing scenarios are based on YHW's rnemo.
`
`SETUP
`: TPK ITO glass panel, 8 x 16 sensors
`: PSo: CYSCTMA3O0-48LTXI
`
`DETAILS
`Description of water tolerant sensing by YHW (memo: YHW-320}
`
`
`
` ' Wetfinger tracking |
`
`
`adry touchscreen
`{| on the touchscreen
`when contiguous
`when water droplets
`i with water droplets
`| are on the surface of
`water Rim covers
`
`
`
`{{
`touchscreen
`surface of
`}
`
`neeeuchscreen
`[Figure 1: Description of water tolerant sensing]
`Reliable touch sensing is defined as correctly displaying the absence/presence of a finger and its
`associated coordinate set ~ Fram YHW’s memo (YHW-320)
`
`
`
` 2CYPRESS
`
`PER FO ROM
`
`
`
`Self-Capimplementation into TMA project.
`
`i. Sensing architecture of Mutual and SelfCan
`To implement the self-cap into existing TMA project, cade was written manually. For the water
`tolerant sensing, unused all sansors are connected to shield out (TX channels} while RX channels
`are used for scanning, it’s as same as done in Neutron for water proofing.
`
`Cshield =aba
`
`4
`| SHIFT Em
`
`“|
`
`
`
`
`
` ;
`eit#2 CYPRESS
`
`.
`
`St.
`Sete
`
`PER EO BA
`
`2, Channel mapping of sample panei
`TPK sample panel is consisted of 8 cols and 16 rows. To scan all cals and rows, only 3 scanning
`process are required because of 8 channels scanning in parallel. Chanel mapping must be carefully
`considered during the schematic drawing and iayout design. Improper channel mapping will case to
`more scanning times,
`
`3. Scanning order and group status
`When group i is being scanned, the rest of groups are connected to shield drive. Same srocessing
`is happened for both group 2 and group3.
`
`
`
`_Shielddrive
`Shielddrive(Ty
`ce ORY
`
`oo
`
`eG
`
`POL:
`Snietd drivel?)
`Sean(RX}
`
`ive(TX
`
`
`
`
`
`Scan {ReO}} ’
`Scan (RX2} ———— Pamaacim
`ok
`oe
`
`_
`SRogspiesSomQgebe.Sistah
`s
`g
`s
`seanBCD eruedecaeoorranennn
`x
`
`HEREIN=
`SootseesSohodx3
`
` goeseeccon ehhhSAAN
`eteSooneetoomecms
`sssinoabsaaSaas
`SEOAh“eeeasSaidAAAS
`
`Saos
`
`
`
`[Figure 4 : Example of group #1 scanning ]
`
`4. APIs for SelfCap sensing
`Blow functions are the basic APIs which are in the source code. All of following APIs are not in the
`user module. If you have different panel with different configuration then the APIs must he
`modified for the application.
`
`TMA300SetPrescaler(SELE_CAP_PRESCALER}:;
`TMA300_SetSubconvlum(SELF_CAP_SBC_NUM);
`TMAI0
![](/site_media/img/document_icon.png)
Accessing this document will incur an additional charge of $.
After purchase, you can access this document again without charge.
Accept $ ChargeStill Working On It
This document is taking longer than usual to download. This can happen if we need to contact the court directly to obtain the document and their servers are running slowly.
Give it another minute or two to complete, and then try the refresh button.
A few More Minutes ... Still Working
It can take up to 5 minutes for us to download a document if the court servers are running slowly.
Thank you for your continued patience.
![](/site_media/img/error_icon.png)
This document could not be displayed.
We could not find this document within its docket. Please go back to the docket page and check the link. If that does not work, go back to the docket and refresh it to pull the newest information.
![](/site_media/img/error_icon.png)
Your account does not support viewing this document.
You need a Paid Account to view this document. Click here to change your account type.
![](/site_media/img/error_icon.png)
Your account does not support viewing this document.
Set your membership
status to view this document.
With a Docket Alarm membership, you'll
get a whole lot more, including:
- Up-to-date information for this case.
- Email alerts whenever there is an update.
- Full text search for other cases.
- Get email alerts whenever a new case matches your search.
![](/site_media/img/document_icon.png)
One Moment Please
The filing “” is large (MB) and is being downloaded.
Please refresh this page in a few minutes to see if the filing has been downloaded. The filing will also be emailed to you when the download completes.
![](/site_media/img/document_icon.png)
Your document is on its way!
If you do not receive the document in five minutes, contact support at support@docketalarm.com.
![](/site_media/img/error_icon.png)
Sealed Document
We are unable to display this document, it may be under a court ordered seal.
If you have proper credentials to access the file, you may proceed directly to the court's system using your government issued username and password.
Access Government Site