UM10720 User manual for the TFT touch demo board OM11058
Contents
1. V 2013 All rights reserved User manual Rev 1 25 June 2013 5 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 2 1 Display layers The basic building elements of for example a passive LCD are shown in Figure 4 Segments transparent opaque AAAA Display glass Top incident light UM10720_03 Fig 4 LCD layers The touch sensor pads can be placed on the same layer as the display ITO as an interleaved pattern in cell or on top of the display glass sandwiched under the polarizer on cell see Figure 5 UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 6 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 Polarizer ITO Layer Touch Glass Polarizer ITO Layer Segment Touch ITO Layer Segment Liquid Crystal Liquid Crystal UM10720_04 UM10720_05 a On cell touch stack b In cell touch stack Fig 5 Touch display technology The features of an in cell stack are e Segment and touch ITO patterns are made in the same process step e Lower LCD module cost e Limited number of touch buttons can be made For the OM11058 a separate foil with top and bottom ITO layers is used 2 2 Touch panel For the touch layer on the TFT display in the O2. to MCU SLEEP IN 2 1 AO IN 3 L i PCA8885 primary IN 7 CLK_IN CLK_OUT SENSOR MATRIX INT_IN INT CPC 0 CPC 7 Vss 100nF T 1 100 nF T Ccpcjo CcPcr7 IN 0 TEST Vpp VDD INTREGD VDD SCL IN 1 SDA SLEEP IN 2 1 AO IN 3 j PCA8885 j secondary IN 7 CLK_IN CLK_OUT INT_IN INT 3 CPC 0 CPC 7 Vss 100nF T 100nF T Ccpcjo CcPci7 013aaa581 Fig 8 Cascaded application diagram UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 9of16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 3 Quick start 3 1 Power supply CAUTION This device needs a USB source that is able to handle 2 5 A Ensure that the USB supply f connection is able to provide this amount of power Otherwise damages may occur e The OM11058 is shipped with a USB cable The USB supply port should be able to source 2 5 A Using the USB connector is also the option giving the highest sensitivity e Alternatively a AC DC power adapter 5 V gt 2 5 A can be used Preferably the power adapter should be a linear converter If a switching mode AC DC converter SMPS is used it should be a three pin connector with protective earth The supply connectors of the OM
3. 11058 are shown in Figure 9 USB or power jack for supply connection Fig 9 Supply connectors 3 2 Operation e When powering up it takes about 30 seconds to get the touch operational due to the delays in the start of the MCU evaluation board in order to get right sequence of interrupts and 12C communication e All buttons are implemented as single switches UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 10 of 16 UM10720 User manual for the TFT touch demo board OM11058 NXP Semiconductors e The temperature up and down buttons see Figure 10 are implemented as touch and hold buttons If the touch lasts longer than half a second the temperature steps up or down 14 steps with 200 ms intervals the number of steps and interval is adjustable in the firmware PLL IT ies Fig 10 Touch display of the OM11058 NXP B V 2013 All rights reserved 11 of 16 All information provided in this document is subject to legal disclaimers Rev 1 25 June 2013 UM10720 User manual NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 4 Waterproof touch display with ultra fast auto calibration UM10720 e A liquid droplet or thick film of condensation is continuously compensated See http www youtube com watch v K7RZM8fPVlw
4. A significant water droplet or a water splash creating a film of water over a touch display or a capacitive touch control panel results in increased capacitance However the self capacitance measurement technique is the most efficient way of adaptability See http www youtube com watch v CT6acNtj 5c Another mechanism for capacitance change could be a magnetic or piezoelectric haptic feedback generator changing the input capacitance to different levels after every event as well as mechanical deformations This is also automatically compensated 4 1 Ensuring reliable operation e Regardless of what causes a capacitive event the most important action is to bring the capacitive sensor back to a functional state after every event be it a real touch a water droplet a haptic feedback event or a mechanical movement Fast auto calibration after every touch and action ensures that the sensor is always ready for the next touch fast auto calibration runs 50 times faster than normal auto calibration This procedure takes just a few milliseconds 1 ms to 5 ms and the sensor IC enters operation mode as soon as the fast calibration is completed without any further intervention from the microcontroller All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 12 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board O
5. CPC7 Fig 2 Block diagram of PCA8885 and PCF8885 TIMING E VOLTAGE y OSCILLATOR CONTROL REGULATOR VDD INTREGD TEST Vpp tdch ref TEST GENERATOR CONTROL B CHANNEL 1 z iNT_IN SYSTEM E INT CONTROL ioe TA TAO to TA leg SCL CHANNEL 0 12C INTERFACE g PCA8885 PCF8885 aaa 007970 Vss UM10720 Key features of the PCA8885 and PCF8885 are Eight independent channels can be configured as 4 x 4 matrix 12C bus interface One subaddress to enable up to 64 keys cascading 2 devices Sleep mode activated via 1 C bus or external input Three sensing modes one key two keys and n keys Two event handling modes direct and latching mode Adjustable scan frequency Channel masking feature Fast start up mode Operating temperature range Tamp 40 C to 85 C TSSOP28 and SO28 package available PCA8885 AEC Q100 compliant for automotive and harsh environment applications All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 4 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 2 Description and technology of OM11058 The OM11058 block diagram is shown in Figure 3 LPC1788 Development kit UM10720_01 Fig 3 Block diagram of the OM11058 UM10720 All information provided in this document is subject to legal disclaimers NXP B
6. M11058 5 References 1 UM10370 User Manual for the PCF8883 Evaluation Kit OM11055 user manual 2 UM10505 OM11057 quick start guide user manual 3 UM10664 PCA8885 and PCF8885 evaluation board OM11056 user manual 4 UM10711 Slim proximity touch sensor demo board OM11052 user manual 5 PCA8885 Capacitive 8 channel touch and proximity sensor with auto calibration and very low power consumption data sheet 6 _PCA8886 Dual channel capacitive proximity switch with auto calibration and large voltage operating range data sheet 7 PCF8883 Capacitive touch proximity switch with auto calibration large voltage operating range and very low power consumption data sheet 8 _PCF8885 Capacitive 8 channel touch and proximity sensor with auto calibration and very low power consumption data sheet UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 13 of 16 NXP Semiconductors UM10720 6 Legal information User manual for the TFT touch demo board OM11058 6 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shal
7. M11058 a separate double sided touch foil with 21 x 13 diamond matrix structure was taken as an off the shelf product IC H1 7 6 5 4 3 2 1 0 N 7 6 5 4 3 2 1 0 J Y IC 2 Available vertical and horizontal lines 8 x 8 lines provide 64 touch buttons of which 16 are 13 x 21 273 points resolution used for the OM11058 Fig 6 7 inch touch panel UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 7 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 If the sensor pads are organized in a matrix layout such as a foil with horizontally connected diamond pads on one side and vertically connected diamond pads on the other side the sensor inputs of a single IC can be used for a 4 x 4 matrix as shown in Figure 7 For larger matrices two PCA8885 packages can be cascaded as shown in Figure 8 to locate the XY position of a touch Bottom layer Top layer 00000 0000 UM10720_08 Fig 7 4x4 matrix layout UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 8 of 16 UM10720 User manual for the TFT touch demo board OM11058 NXP Semiconductors VDD TEST V R 4 IN O in PU PU DD INTREGD 100 nF SCL IN 1 SDA
8. PCA8885 and PCF8885 multi channel capacitive proximity sensors 3 2 Description and technology of OM11058 5 2 1 Display layers nespi ata a ae eee eee 6 2 2 Touch panel 2 25 s 8 eset bee ee eee ies 7 3 QUICK start js s ecw aa E 10 3 1 Power supply 0 00 eee ee eee 10 3 2 Operations oane pada pad aoe be adn deed 10 4 Waterproof touch display with ultra fast auto calibration 0 0 c eee eee eee 12 4 1 Ensuring reliable operation 12 5 References 200 c cece eee eee eee 13 6 Legal information 00 cee eens 14 6 1 Definition Ss ena aaan 4 EE e Rede 14 6 2 DisclalMers lt se2ytcs da gaa ake bees es 14 6 3 Licenses snee ta name eck acute sented 14 6 4 Trademarks 00 002 e eee eee 14 7 FIQUIES a eiecieedsiecei a ara ace yee cae ae eee eae 15 8 CONTI ose a ieee ce essere ond ane e sree ates wre ees 16 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information NXP B V 2013 All rights reserved For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 25 June 2013 Document identifier UM10720
9. UM10720 User manual for the TFT touch demo board OM11058 Rev 1 25 June 2013 User manual Document information Info Content Keywords OM11058 PCA8885 PCF8885 capacitive touch sensor touch on TFT touch foil Abstract The OM11058 demonstrates the capabilities of the PCA8885 and PCF8885 for touch on display by using a double sided ITO touch foil with a diamond matrix and two ICs cascaded for an 8 x 8 resolution on a 7 inch TFT display NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 Revision history Rev Date Description v 1 20130625 new user manual first revision Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 2 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 1 Introduction Fig 1 OM11058 demo board UM10720 1 1 Interactive user interfaces like in smartphones have become a must also in automotive industrial and white goods control units Unlike smartphones where multi touch drag and drop and zooming features are used the dedicated user interfaces in for instance climate control or washing machine only have to be a replacemen
10. acitive sensing functionality This NXP Semiconductors IC is made under license to European Patent No 0723339 owned by EDISEN SENSOR SYSTEME GmbH amp CO KG and counterparts Any license fee is included in the purchase price 6 4 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners l2C bus logo is a trademark of NXP B V NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 14 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 7 Figures Fig1 OM11058 demo board 0000 3 Fig 2 Block diagram of PCA8885 and PCF8885 4 Fig 3 Block diagram of the OM11058 5 Fig4 LCDlayers 00 2 e eee eee 6 Fig 5 Touch display technology 7 Fig6 7 inch touch panel 2 2 055 7 Fig7 4 4matrixlayout 0 0000 8 Fig 8 Cascaded application diagram 9 Fig9 Supply connectors 000 0c eee eae 10 Fig 10 Touch display of the OM11058 11 UM10720 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 15 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 8 Contents 1 Introduction siai 4s0ceeeeceee cee dee ee 3 1 1 The
11. ime and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical systems or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors and its suppliers accept no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product design It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of UM10720 All informatio
12. is product remains with customer In no event shall NXP Semiconductors its affiliates or their suppliers be liable to customer for any special indirect consequential punitive or incidental damages including without limitation damages for loss of business business interruption loss of use loss of data or information and the like arising out the use of or inability to use the product whether or not based on tort including negligence strict liability breach of contract breach of warranty or any other theory even if advised of the possibility of such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and customer s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars US 5 00 The foregoing limitations exclusions and disclaimers shall apply to the maximum extent permitted by applicable law even if any remedy fails of its essential purpose Translations A non English translated version of a document is for reference only The English version shall prevail in case of any discrepancy between the translated and English versions 6 3 Licenses ICs with cap
13. l have no liability for the consequences of use of such information 6 2 Disclaimers Limited warranty and liability Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outside of NXP Semiconductors In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages including without limitation lost profits lost savings business interruption costs related to the removal or replacement of any products or rework charges whether or not such damages are based on tort including negligence warranty breach of contract or any other legal theory Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any t
14. n provided in this document is subject to legal disclaimers customer s third party customer s Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products NXP Semiconductors does not accept any liability related to any default damage costs or problem which is based on any weakness or default in the customer s applications or products or the application or use by customer s third party customer s Customer is responsible for doing all necessary testing for the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer s NXP does not accept any liability in this respect Export control This document as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from competent authorities Evaluation products This product is provided on an as is and with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of th
15. t of mechanical buttons by on display touch buttons Accordingly the hardware and software design should be as simple as possible The PCA8885 and PCF8885 are providing very suitable features for easy configuration connection of various numbers of channels optimization of sensitivity and sampling for each application The purpose of the OM11058 is to demonstrate the capabilities of the PCA8885 and PCF8885 for touch displays The PCA8885 and PCF8885 multi channel capacitive proximity sensors The PCA8885 and PCF8885 are capacitive 8 channel touch and proximity sensors detecting changes in capacitance on remote sensing plates Changes in the static capacitances as opposed to dynamic capacitance changes are automatically All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 25 June 2013 3 of 16 NXP Semiconductors U M1 0720 User manual for the TFT touch demo board OM11058 compensated using continuous auto calibration Remote sensing plates for example conductive foils can be connected to the IC The eight input channels operate independently of each other There is also a built in option for a matrix arrangement of the sensors interrupts are generated only when two channels are activated simultaneously suppression of additional channel outputs when two channels are already active CLK_IN CLK_OUT INO CPCO IN1 CPC1 IN7
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