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Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 8
Technical content
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: –I 2C-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 9509AS–AT42–10/08
9509AS–AT42–10/08 QT5320 1. Pinout and Schematic
1.1 Pinout Configuration
1.2 Pin Descriptions
Table 1-1. Pin Listing Pin Name Type Comments If Unused, Connect To...
1 Y3A I Y line connection Leave open
2 CHANGE OD State change notification –
3 Vss P Supply ground –
4 Vdd P Power –
5 Vss P Supply ground –
6 Vdd P Power –
7 X6 O X matrix drive line Leave open
8 X7 O X matrix drive line Leave open
9 TRIGGER I Trigger input (active low) Vdd or Vss
10 Vref I Supply ground –
11 SMP O Sample output. –
12 X0 O X matrix drive line Leave open
13 X1 O X matrix drive line Leave open
14 X2 O X matrix drive line Leave open
15 X3 O X matrix drive line Leave open
16 X4 O X matrix drive line Leave open
17 X5 O X matrix drive line Leave open
FORCE_S
9509AS–AT42–10/08 QT5320
18 Vdd P Power –
19 FORCE_S I Force sensor input Vdd or Vss
20 Vdd P Power –
21 Vss P Supply ground –
22 A0 I I2C-compatible address select –
23 Y0B I Y line connection Leave open
24 Y1B I Y line connection Leave open
25 Y2B I Y line connection Leave open
26 Y3B I Y line connection Leave open
27 SDA OD Serial Interface Data –
28 SCL OD Serial Interface Clock –
29 RST
I Reset low; has internal 30k - 60k pull-up Leave open or Vdd
30 Y0A I Y line connection Leave open
31 Y1A I Y line connection Leave open
32 Y2A I Y line connection Leave open
Table 1-1. Pin Listing Pin Name Type Comments If Unused, Connect To...
9509AS–AT42–10/08 QT5320
1.3 Schematic
Figure 1-1. Typical Circuit Suggested regulator manufacturers: Torex (XC6215 series) Seiko (S817 series) BCDSemi (AP2121 series) Rp Rp Rp Ry3 Ry2 Ry1 Ry0 Rs2 Rs0 SCL SDA Creg VREG Rx7 Cs3 Cs2 Cs1 Cs0 Rx1 Rx4 VDD Rs3 Rs1 Rx3 Rx2 Rx6 Rx0 Rx5 Vunreg VDD VDD M A T R I XYS C A NI N ADDRESS SELECT FORCE SENSOR CHANGE Creg TRIGGER I2C QT5320 Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). Add two 100nF capacitors: one close to pins 4 and 6, and another close to pins 18 and 20. MATRIX X DRIVE 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.
9509AS–AT42–10/08 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 ™ capacitive 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.
9509AS–AT42–10/08 QT5320 Figure 2-1. Example Touchscreen Configurations Y X QT5320 X0 X1 X2 X3 X4 X5 X6 X7 Y X X0 X1 X2 X3 X4 X5 X6 X7 QT5320 = slider = touchscreen = key = disabled Object Color Code
9509AS–AT42–10/08 QT5320 3. Revision History Revision No. History Revision AS – October 2008 Initial release for chip revision 5.0
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