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UM10720
User manual for the TFT touch demo board OM11058
Rev. 1 — 25 June 2013
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 8 resolution on a 7 inch
TFT display
User manual
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Summary of Contents for NXP Semiconductors OM11058
- Page 1 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...
- Page 2 UM10720 NXP Semiconductors User manual for the TFT touch demo board OM11058 Revision history Date Description 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.
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Page 3: Fig 1. Om11058 Demo Board
The purpose of the OM11058 is to demonstrate the capabilities of the PCA8885 and PCF8885 for touch displays. 1.1 The PCA8885 and PCF8885 multi-channel capacitive proximity... -
Page 4: Fig 2. Block Diagram Of Pca8885 And Pcf8885
UM10720 NXP Semiconductors 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. -
Page 5: Fig 3. Block Diagram Of The Om11058
UM10720 NXP Semiconductors User manual for the TFT touch demo board OM11058 2. Description and technology of OM11058 The OM11058 block diagram is shown in Figure 13 x 21 line diamond structure on two layers 7” TFT display Interconnection board for FPC... -
Page 6: Fig 4. Lcd Layers
UM10720 NXP Semiconductors 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 Segments: transparent opaque Polarizer Display glass - Top Segments – Top ITO Liquid crystal molecules Common –... -
Page 7: Fig 5. Touch Display Technology
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 OM11058, a separate double sided touch foil with 21 13 diamond matrix structure was taken as an off-the-shelf product. -
Page 8: Fig 7. 4 ´ 4 Matrix Layout
UM10720 NXP Semiconductors 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 ... -
Page 9: Fig 8. Cascaded Application Diagram
UM10720 NXP Semiconductors User manual for the TFT touch demo board OM11058 100 nF TEST R PU R PU IN[0] DD(INTREGD) 100 nF IN[1] to MCU SLEEP IN[2] IN[3] PCA8885 (primary) IN[7] CLK_IN CLK_OUT INT_IN SENSOR MATRIX CPC[0] CPC[7] 100 nF... -
Page 10: Fig 9. Supply Connectors
Otherwise, damages may occur. • 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. -
Page 11: Fig 10. Touch Display Of The Om11058
UM10720 NXP Semiconductors User manual for the TFT touch demo board OM11058 • 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). -
Page 12: Waterproof Touch Display With Ultra Fast Auto-Calibration
UM10720 NXP Semiconductors User manual for the TFT touch demo board OM11058 4. Waterproof touch display with ultra fast auto-calibration • A liquid droplet or thick film of condensation is continuously compensated. (See http://www.youtube.com/watch?v=K7RZM8fPVlw). • 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. -
Page 13: References
UM10720 NXP Semiconductors User manual for the TFT touch demo board OM11058 5. References UM10370 — User Manual for the PCF8883 Evaluation Kit OM11055; user manual UM10505 — OM11057 quick start guide; user manual UM10664 — PCA8885 and PCF8885 evaluation board OM11056; user manual UM10711 —... -
Page 14: Legal Information
In no event shall NXP Semiconductors, its affiliates or their suppliers be liable replacement of any products or rework charges) whether or not such to customer for any special, indirect, consequential, punitive or incidental... -
Page 15: Table Of Contents
7. Figures Fig 1. OM11058 demo board ..... .3 Fig 2. Block diagram of PCA8885 and PCF8885..4 Fig 3. -
Page 16: Contents
....3 Description and technology of OM11058..5 Display layers ......6 Touch panel .
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