AT42QT5480 - Summary

Features
• Configurations:
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– 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
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Key Suppression ™, AKS ™, QField™, QMatrix ™, QTouch ™, QSlide™, QWheel™, Two Touch ™, QTwo ™ and others are trademarks of Atmel
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9510AS–AT42–10/08
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