AT42QT5320

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 32 (subject to other configurations) QSlide™/QWheel™: – Configurable up to four 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 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: – 32-pin 5 x 5mm MLF RoHS compliant Signal Processing: – Self-calibration, auto drift compensation, noise filtering, Adjacent Key Suppression technology • • • • • • • • QTwo™ 10-bit Touchscreen Controller AT42QT5320 Summary • • • • • Note: This is a summary document. A complete document is available under NDA. For more information contact www.atmel.com/touchscreen. 9509AS–AT42–10/08 1. Pinout and Schematic 1.1 Pinout Configuration Y2B Y3B SDA RST Y0A SCL Y1A Y2A Y3A CHANGE Vss Vdd Vss Vdd X6 X7 1 2 3 4 5 6 7 8 32 31 30 29 28 27 26 25 24 23 Y1B Y0B A0 Vss Vdd FORCE_S Vdd X5 QT5320 22 21 20 19 18 17 9 10 11 12 13 14 15 16 TRIGGER X1 X0 SMP VREF X2 X4 X3 1.2 Pin Descriptions Pin Listing Name Y3A CHANGE Vss Vdd Vss Vdd X6 X7 TRIGGER Vref SMP X0 X1 X2 X3 X4 X5 Type I OD P P P P O O I I O O O O O O O Comments Y line connection State change notification Supply ground Power Supply ground Power X matrix drive line X matrix drive line Trigger input (active low) Supply ground Sample output. X matrix drive line X matrix drive line X matrix drive line X matrix drive line X matrix drive line X matrix drive line If Unused, Connect To... Leave open – – – – – Leave open Leave open Vdd or Vss – – Leave open Leave open Leave open Leave open Leave open Leave open Table 1-1. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 2 QT5320 9509AS–AT42–10/08 QT5320 Table 1-1. Pin 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Pin Listing Name Vdd FORCE_S Vdd Vss A0 Y0B Y1B Y2B Y3B SDA SCL RST Y0A Y1A Y2A Type P I P P I I I I I OD OD I I I I Comments Power Force sensor input Power Supply ground I2C-compatible address select Y line connection Y line connection Y line connection Y line connection Serial Interface Data Serial Interface Clock Reset low; has internal 30k - 60k pull-up Y line connection Y line connection Y line connection If Unused, Connect To... – Vdd or Vss – – – Leave open Leave open Leave open Leave open – – Leave open or Vdd Leave open Leave open Leave open 3 9509AS–AT42–10/08 1.3 Schematic Typical Circuit Add two 100nF capacitors: one close to pins 4 and 6, and another close to pins 18 and 20. Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). Figure 1-1. Vunreg Creg VDD VREG Creg Rx7 VDD Rx5 Rx4 Rp SDA SCL VDD Rp CHANGE Cs0 Ry1 Rp Rx3 QT5320 I2C Rx2 Rx1 Rx0 Ry0 TRIGGER FORCE SENSOR ADDRESS SELECT Cs1 Ry2 Cs2 Ry3 Cs3 NOTES: 1) The central pad on the underside of the 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. 3) Leave YnA, YnB unconnected if not used. Rs3 Rs2 Rs1 Rs0 Suggested regulator manufacturers: • Torex (XC6215 series) • Seiko (S817 series) • BCDSemi (AP2121 series) 4 QT5320 9509AS–AT42–10/08 MATRIX Y SCAN IN MATRIX X DRIVE Rx6 QT5320 2. Overview of the QT5320 2.1 Introduction The QT5320 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 QT5320 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 QT5320 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. 5 9509AS–AT42–10/08 Figure 2-1. Example Touchscreen Configurations QT5320 Y3 Y2 Y1 Y0 X0 X1 X2 X3 X4 X5 X6 X7 Y X QT5320 Y3 Y2 Y1 Y0 X0 X1 X2 X3 X4 X5 X6 X7 Y X Object Color Code = disabled = key = slider = touchscreen 6 QT5320 9509AS–AT42–10/08 QT5320 3. Revision History Revision No. Revision AS – October 2008 History Initial release for chip revision 5.0 7 9509AS–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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A tmel 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. 9509AS–AT42–10/08