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 Y1B Y3B Y2B Y0B Vdd Vss GPO0 SMP VREF CHANGE GPO1 GPO2 GPO3 1 44 43 42 41 40 39 38 37 36 35 34 33 Y4B 2 32 Y5B TRIGGER RST 3 31 FORCE_S 4 30 A0 Vdd 5 29 Vdd Vss 6 28 Vss XT2 7 27 Vdd XT1 8 26 Y5A X0 9 25 Y4A X1 10 24 Y3A X2 11 23 12 13 14 15 16 17 18 19 20 21 22 Y2A QT5480 Y1A Y0A SDA SCL Vss Vdd X7 X6 X5 X4 X3 QT5480 2 QT5480 9510AS–AT42–10/08 QT5480 1.2 Pin Descriptions Table 1-2. Pin Listing Pin Ball Name Type Comments If Unused, Connect To... 1 B2 GPO2 O General purpose output 2 Leave open 2 B1 GPO3 O General purpose output 3 Leave open 3 C3 TRIGGER I Trigger input (active low) Vss 4 C2 RST I Reset low; has internal 30k - 60k pull-up 5 A5 Vdd P Power – 6 A1 Vss P Supply ground – 7 D2 XT2 X Clock resonator – 8 E1 XT1 X Clock resonator – 9 D3 X0 O X matrix drive line Leave open 10 E2 X1 O X matrix drive line Leave open 11 F1 X2 O X matrix drive line Leave open 12 F2 X3 O X matrix drive line Leave open 13 G2 X4 O X matrix drive line Leave open 14 E3 X5 O X matrix drive line Leave open 15 F3 X6 O X matrix drive line Leave open 16 E4 X7 O X matrix drive line Leave open 17 C1 Vdd P Power – 18 A4 Vss P Supply ground – 19 F4 SCL OD Serial Interface Clock – 20 G5 SDA OD Serial Interface Data – 21 F5 Y0A I Y line connection Leave open 22 G6 Y1A I Y line connection Leave open 23 F6 Y2A I Y line connection Leave open 24 E5 Y3A I Y line connection Leave open 25 F7 Y4A I Y line connection Leave open 26 E6 Y5A I Y line connection Leave open 27 E7 Vdd P Power – 28 A7 Vss P Supply ground – 29 C7 Vdd P Power – 30 D6 A0 I I2C-compatible address select – 31 C6 FORCE_S I Force sensor input Vdd or Vss 32 B7 Y5B I Y line connection Leave open 33 D5 Y4B I Y line connection Leave open 34 B6 Y3B I Y line connection Leave open 35 A6 Y2B I Y line connection Leave open Leave open or Vdd 3 9510AS–AT42–10/08 Table 1-2. 4 Pin Listing (Continued) Pin Ball Name Type Comments If Unused, Connect To... 36 C5 Y1B I Y line connection Leave open 37 B5 Y0B I Y line connection Leave open 38 G3 Vdd P Power – 39 D1 Vss P Supply ground – 40 B4 GPO0 O General purpose output 0 41 C4 SMP O Sample output. – 42 A3 Vref I Reference input – 43 B3 CHANGE OD State change notification – 44 A2 GPO1 O General purpose output 1 Leave open – D4 Vss P Supply ground – – D7 Vss P Supply ground – – G1 Vss P Supply ground – – G4 Vss P Supply ground – – G7 Vss P Supply ground – Leave open QT5480 9510AS–AT42–10/08 QT5480 1.3 Schematic Figure 1-1. Typical Circuit Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). Vunreg Add two 100nF capacitors: one close to pins 5, 17 and 38, and another close to pins 27 and 29. VREG Rx7 MATRIX X DRIVE Rx6 Rx5 Rx4 VDD QT5480 Rx3 Rx2 Rp Rx1 Rx0 Ry0 Cs0 Ry1 XT1 16MHz Ry2 Cs2 Ry3 Cs3 MATRIX Y SCAN IN Cs1 Ry4 VDD Cs4 Rp Rp Ry5 Cs5 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 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 Add two 100nF capacitors: one close to balls A5, C1 and G3, and another close to balls E7 and C7. VREG Rx7 Rx5 QT5480 Rp MATRIX X DRIVE Rx6 VDD Rx4 Rx3 Rx2 Rx1 Rx0 Ry0 Cs0 XT1 16MHz Ry1 Ry2 Cs2 Ry3 VDD Cs3 Rp MATRIX Y SCAN IN Cs1 Rp Ry4 Cs4 Ry5 Cs5 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 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 ™ capacitive 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 QT5480 Y5 Y5 Y4 Y4 Y X Y3 Y3 Y2 Y2 Y X Y1 Y1 Y0 Y0 X0 X1 X2 X3 X4 X5 X6 X7 X0 X1 X2 X3 X4 X5 X6 X7 Object Color Code = disabled = key = slider = touchscreen 8 QT5480 9510AS–AT42–10/08 QT5480 3. Revision History Revision No. History Revision AS – October 2008 Initial release for chip revision 5.0 9 9510AS–AT42–10/08 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 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 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 Technical Support [email protected] Sales Contact www.atmel.com/contacts 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 Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDITIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 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 ™ and 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