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Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 10
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 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: –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: – 44-pin 7 x 7 mm ML F 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 9510AS–AT42–10/08
9510AS–AT42–10/08 QT5480 1. Pinout and Schematic
1.1 Pinout Configurations
FORCE_S Y5B Y4B 11 23 3344 43 42 41 40 39 38 37 36 3435 12 13 14 22 2119 2018171615 QT5480 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
I Reset low; has internal 30k - 60k pull-up Leave open or Vdd 5A 5 V d d P P o w e r –
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
9510AS–AT42–10/08 QT5480
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 Leave open
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 – Table 1-2. Pin Listing (Continued) Pin Ball Name Type Comments If Unused, Connect To...
9510AS–AT42–10/08 QT5480
1.3 Schematic
Figure 1-1. Typical Circuit Rs3 Rp Rx4 Rx5 VREG Rs5 Rs4 Cs5 Cs4 Cs2 Cs1 Rx3 Rs2 Rs1 Rs0 Ry4 Ry1 Rp Rp XT1 16MHz Cs3 Cs0 Rx7 Rx1 Ry5 Ry2 Vunreg VDD Ry3 Ry0 MATRIX X DRIVE M A T R I XYS C A NI N Rx0 Rx6 VDD Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). Rx2 Add two 100nF capacitors: one close to pins 5, 17 and 38, and another close to pins 27 and 29. QT5480 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. 3) Leave YnA, YnB unconnected if not used
9510AS–AT42–10/08 QT5480 Figure 1-2. Typical Circuit – BGA Suggested regulator manufacturers: Torex (XC6215 series) Seiko (S817 series) BCDSemi (AP2121 series) Cs4 Cs1 Rs4 Cs5 Cs3 Cs2 Cs0 VDD Vunreg Rp VREG Rp 16MHz Rs5 Rx3 Rs2 Rs1 Rs0 Ry3 Ry0 Rp VDD XT1 Rx7 Rx5 Rx1 Ry5 Ry2 MATRIX X DRIVE Ry4 Ry1 M A T R I XYS C A NI N Rs3 Rx0 Rx6 Rx2 Rx4QT5480 Follow regulator manufacturer's recommended values for input and output bypass capacitors (Creg). 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 Add two 100nF capacitors: one close to balls A5, C1 and G3, and another close to balls E7 and C7.
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.
9510AS–AT42–10/08 QT5480 Figure 2-1. Example Touchscreen Configurations X0 X1 X2 X3 X4 X5 X6 X7 QT5480 X0 X1 X2 X3 X4 X5 X6 X7 QT5480 Y X Y X = slider = touchscreen = key = disabled Object Color Code
9510AS–AT42–10/08 QT5480 3. Revision History Revision No. History Revision AS – October 2008 Initial release for chip revision 5.0
9510AS–AT42–10/08 Headquarters International Atmel Corporation
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