AT42QT5480

Features • Configurations: – Can be configured as a combination of touchscreen, sliders/wheels and keys, with Adjacent Key Suppression™ (AKS™) technology between groups QField™ Touchscreen: – Two-touch capable with independent XY tracking for one or two concurrent touches in real time, with touch size reporting – Up to eight-inch diagonal screen size supported – 1024 x 1024 resolution Discrete Keys: – Up to 48 (subject to other configurations) QSlide™/QWheel™: – Configurable up to six independent sliders/wheels Linearity: – Screen design dependent but typically better than ±1 percent Filtering: – Advanced digital filtering (user configurable) Response Times: – Sub 15 ms possible, depending on filter settings General Purpose Outputs (GPOs): – Up to four user controllable outputs Technology: – Patented charge-transfer (transverse mode) Panel Thickness: – Glass up to 5 mm, screen size dependent – Plastic up to 3 mm, screen size dependent Channel Sensitivity: – Individually settable via simple commands over serial interface Interface: – I2C-compatible slave mode, 100 kHz or 400 kHz with 2.7V or greater Vdd Power: – 1.8V to 5.5V (2.7V to 5.5V in high speed mode) Packages: – 44-pin 7 x 7 mm MLF RoHS compliant – 44-pin 10 x 10 mm TQFP RoHS compliant – 49-ball 5 x 5 mm BGA RoHS compliant Signal Processing: – Self-calibration, auto drift compensation, noise filtering, Adjacent Key Suppression technology • • • • • • • • • QTwo™ 10-bit Touchscreen Controller AT42QT5480 Summary • • • • • Note: This is a summary document. A complete document is available under NDA. For more information contact www.atmel.com/touchscreen. 9510AS–AT42–10/08 1. Pinout and Schematic 1.1 Pinout Configurations CHANGE GPO1 1 2 3 4 5 6 7 8 9 10 GPO0 SMP VREF Y0B Vdd Vss Y3B Y2B Y4B Y5B FORCE_S A0 Vdd Vss Vdd Y5A Y4A Y3A Y2A Y1B GPO2 GPO3 TRIGGER RST Vdd Vss XT2 XT1 X0 X1 X2 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 QT5480 28 27 26 25 24 11 23 12 13 14 15 16 17 18 19 20 21 22 X3 X6 X5 X4 X7 Vdd SCL Vss SDA Y1A Y0A QT5480 2 QT5480 9510AS–AT42–10/08 QT5480 1.2 Pin Descriptions Pin Listing Ball B2 B1 C3 C2 A5 A1 D2 E1 D3 E2 F1 F2 G2 E3 F3 E4 C1 A4 F4 G5 F5 G6 F6 E5 F7 E6 E7 A7 C7 D6 C6 B7 D5 B6 A6 Name GPO2 GPO3 TRIGGER RST Vdd Vss XT2 XT1 X0 X1 X2 X3 X4 X5 X6 X7 Vdd Vss SCL SDA Y0A Y1A Y2A Y3A Y4A Y5A Vdd Vss Vdd A0 FORCE_S Y5B Y4B Y3B Y2B Type O O I I P P X X O O O O O O O O P P OD OD I I I I I I P P P I I I I I I Comments General purpose output 2 General purpose output 3 Trigger input (active low) Reset low; has internal 30k - 60k pull-up Power Supply ground Clock resonator Clock resonator X matrix drive line X matrix drive line X matrix drive line X matrix drive line X matrix drive line X matrix drive line X matrix drive line X matrix drive line Power Supply ground Serial Interface Clock Serial Interface Data Y line connection Y line connection Y line connection Y line connection Y line connection Y line connection Power Supply ground Power I2C-compatible address select Force sensor input Y line connection Y line connection Y line connection Y line connection If Unused, Connect To... Leave open Leave open Vss Leave open or Vdd – – – – Leave open Leave open Leave open Leave open Leave open Leave open Leave open Leave open – – – – Leave open Leave open Leave open Leave open Leave open Leave open – – – – Vdd or Vss Leave open Leave open Leave open Leave open Table 1-2. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 3 9510AS–AT42–10/08 Table 1-2. Pin 36 37 38 39 40 41 42 43 44 – – – – – Pin Listing (Continued) Ball C5 B5 G3 D1 B4 C4 A3 B3 A2 D4 D7 G1 G4 G7 Name Y1B Y0B Vdd Vss GPO0 SMP Vref CHANGE GPO1 Vss Vss Vss Vss Vss Type I I P P O O I OD O P P P P P Comments Y line connection Y line connection Power Supply ground General purpose output 0 Sample output. Reference input State change notification General purpose output 1 Supply ground Supply ground Supply ground Supply ground Supply ground If Unused, Connect To... Leave open Leave open – – Leave open – – – Leave open – – – – – 4 QT5480 9510AS–AT42–10/08 QT5480 1.3 Schematic Typical Circuit Add two 100nF capacitors: one close to pins 5, 17 and 38, and another close to pins 27 and 29. Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). Vunreg VREG Figure 1-1. Rx7 Rx6 Rx5 Rx4 VDD Rp QT5480 Rx3 Rx2 Rx1 Rx0 Ry0 Cs0 Ry1 Cs1 Cs2 Ry3 Cs3 Ry4 VDD Cs4 Rp Rp Cs5 Ry5 NOTES: 1) The central pad on the underside of the MLF chip is a Vss pin and should be connected to ground. Do not put any other tracks underneath the body of the chip. 2) It is important to place all Cs, Rs, Rx and Ry components physically near to the chip. Rs5 Rs4 Rs3 Rs2 Rs1 Rs0 3) Leave YnA, YnB unconnected if not used MATRIX Y SCAN IN XT1 16MHz Ry2 MATRIX X DRIVE 5 9510AS–AT42–10/08 Figure 1-2. Typical Circuit – BGA Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). Vunreg VREG Add two 100nF capacitors: one close to balls A5, C1 and G3, and another close to balls E7 and C7. Rx7 Rx5 Rx4 Rx3 Rx2 Rx1 Rx0 Ry0 Cs0 XT1 16MHz Cs1 Ry2 Cs2 Ry3 Cs3 Rp Rp Ry4 Cs4 Ry5 Cs5 Ry1 Rp QT5480 VDD NOTES: 1) It is important to place all Cs, Rs, Rx and Ry components physically near to the chip. 2) Leave YnA, YnB unconnected if not used Rs5 Rs4 Rs3 Rs2 Rs1 Rs0 Suggested regulator manufacturers: • Torex (XC6215 series) • Seiko (S817 series) • BCDSemi (AP2121 series) 6 QT5480 9510AS–AT42–10/08 MATRIX Y SCAN IN MATRIX X DRIVE VDD Rx6 QT5480 2. Overview of the QT5480 2.1 Introduction The QT5480 is a versatile capacitive touchscreen controller, able to support a diagonal touchscreen of up to 8 inches. The IC supports Two Touch™ operation, part of the QTwo™ family of devices from Atmel®. The QT5480 uses Atmel's patented QMatrix ™ c apacitive sensing technique, which offers excellent moisture tolerance, fast acquisition and outstanding ground load immunity. A unique feature of the QT5480 is that it allows a choice to be made as to how many of the capacitive measurement channels form part of a touchscreen, and which ones form discrete keys or sliders. This controller offers unrivalled flexibility to create touchscreens, sliders and keys. The device can report two touches on a touchscreen making it suitable for next generation touch interfaces. Concurrent use of a touchscreen plus keys or sliders is also possible. By treating all capacitive channels equally during measurement, and then applying additional signal processing, the device allows the channels to be used as part of a touchscreen, or part of one or more sliders, or as discrete touch keys. Touchscreens can be created that are of arbitrary channel length and width. Channels not used in the touchscreen can either be turned into sliders or keys. There are some constraints on the starting channels for touchscreens and sliders, but these have no practical impact for most applications. The controller also has the ability to save a Y line when configuring a touchscreen, reusing it in the touchscreen pattern at the two edges. This saved Y line can then be used to create extra objects like a slider or multiple keys, while allowing the touchscreen to be sized as though it was “one Y line larger”. In this “wrapped Y line” mode Two Touch processing cannot be used. See Figure 2-1 for configuration examples. 7 9510AS–AT42–10/08 Figure 2-1. Example Touchscreen Configurations QT5480 Y5 Y4 Y3 Y2 Y1 Y0 X0 X1 X2 X3 X4 X5 X6 X7 Y X QT5480 Y5 Y4 Y3 Y2 Y1 Y0 X0 X1 X2 X3 X4 X5 X6 X7 Y X Object Color Code = disabled = key = slider = touchscreen 8 QT5480 9510AS–AT42–10/08 QT5480 3. Revision History Revision No. Revision AS – October 2008 History Initial release for chip revision 5.0 9 9510AS–AT42–10/08 Headquarters Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 International Atmel Asia Unit 01-05 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Touch Technology Division 1 Mitchell Point Ensign Way Hamble Southampton Hampshire SO31 4RF United Kingdom Tel: (44) 23-8056-5600 Fax: (44) 23-8045-3939 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-enYvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Product Contact Web Site www.atmel.com Technical Support touch@atmel.com Sales Contact www.atmel.com/contacts Literature Requests www.atmel.com/literature Disclaimer: T he information in this document is provided in connection with Atmel products. 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Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © 2008 Atmel Corporation. All rights reserved. Atmel®, Atmel logo and combinations thereof, and others are registered trademarks, Adjacent Key Suppression ™, AKS ™, QField™, QMatrix ™, QTouch ™, QSlide™, QWheel™, Two Touch ™, QTwo ™ a nd others are trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be registered trademarks or trademarks of others. 9510AS–AT42–10/08