Features
• Configurations:
– Can be configured as a combination of touchscreen, sliders/wheels and keys, with
Adjacent Key Suppression
• 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
• Technolo g y:
– 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:
2
C-compatible slave mode, 100 kHz or 400 kHz with 2.7V or greater Vdd
–I
• 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
™
(AKS™) technology between groups
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
Y2A
Y1A
Y0A
RST
SCL
SDA
Y3B
Y2B
TRIGGER
VREF
SMPX0X1X2X3
X4
Y3A
CHANGE
Vss
Vdd
Vss
Vdd
X6
X7 X5
Vdd
Vdd
Vss
A0
Y0B
Y1B
1
2
3
4
5
6
7
817
18
19
20
21
22
23
24
32
31
30
29
282726
25
9
10
11
16
15
14
13
12
QT5320
FORCE_S
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
2
QT5320
9509AS–AT42–10/08
QT5320
Table 1-1. Pin Listing
Pin Name Type Comments If Unused, Connect To...
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
30 Y0A I Y line connection Leave open
I Reset low; has internal 30k - 60k pull-up Leave open or Vdd
31 Y1A I Y line connection Leave open
32 Y2A I Y line connection Leave open
9509AS–AT42–10/08
3
1.3 Schematic
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
MATRIXYSCANIN
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.
Figure 1-1. Typical Circuit
Suggested regulator manufacturers:
• Torex (XC6215 series)
• Seiko (S817 series)
• BCDSemi (AP2121 series)
4
QT5320
9509AS–AT42–10/08
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
of devices from Atmel
The QT5320 uses Atmel's patented QMatrix
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.
QT5320
™
®
.
™
capacitive sensing technique, which offers
operation, part of the QTwo™ family
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
5
Figure 2-1. Example Touchscreen Configurations
Y
X
QT5320
Y3
Y2
Y1
Y0
X0 X1 X2 X3 X4 X5 X6 X7
Y
X
Y3
Y2
Y1
Y0
X0 X1 X2 X3 X4 X5 X6 X7
QT5320
= slider
= touchscreen
= key
= disabled
Object Color Code
6
QT5320
9509AS–AT42–10/08
3. Revision History
Revision No. History
Revision AS – October 2008 Initial release for chip revision 5.0
QT5320
9509AS–AT42–10/08
7
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www.atmel.com/literature
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© 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™, Tw o To u c h™, QTwo™ and 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
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