lQ
QT1081
8-KEY QTOUCH™ SENSOR IC
This datasheet is applicable to all revision 1 chips
The QT1081 is an improved, lower cost, simplified circuit version of the
popular QT1080 sensor IC. The QT1081 is designed for low cost
appliance, mobile, and consumer electronics applications.
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22 21 20 19 18
24
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QTouch™ technology is a type of patented charge-transfer sensing
method well known for its robust, stable, EMC-resistant characteristics.
It is the only all-digital capacitive sensing technology in the market
today. This technology has over a decade of applications experience
spanning thousands of designs.
SNS5
OUT_0
25
SNS4K
SNS4
OUT_1 26
OUT_2 27
OUT_3 28
15
14
13
12
11
10
SNS3K
QT1081
32-QFN
29
OUT_4
OUT_5 30
OUT_6
SNS3
SNS2K
SNS2
SN1K
QTouch circuits are renowned for simplicity, reliability, ease of design,
and cost effectiveness.
31
OUT_7 32
QTouch™ sensors employ a single reference capacitor tied to two pins
of the chip for each sensing key; a signal trace leads from one of the
pins to the sensing electrode which forms the key. The sensing
electrode can be a simple solid shape such as a rectangle or circle. An
LED can be placed near or inside the solid circle for illumination.
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8
2
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3
5
1
4
6
The key electrodes can be designed into a conventional printed circuit
board (PCB) or flexible printed circuit board (FPCB) as a copper
pattern, or as printed conductive ink.
The QT1081 is also compatible with clear films to make simple
button-style touch screens over LCD displays.
AT A GLANCE
Number of keys:
1 to 8
Patented spread-spectrum charge-transfer (one-per-key mode)
Technology:
Key outline sizes:
Key spacings:
Electrode design:
Layers required:
Substrates:
5mm x 5mm or larger (panel thickness dependent); widely different sizes and shapes possible
6mm or wider, center to center (panel thickness, human factors dependent)
Single solid or ring shaped electrodes; wide variety of possible layouts
One layer substrate; electrodes and components can be on same side
FR-4, low cost CEM-1 or FR-2 PCB materials; polyamide FPCB; PET films, glass
Copper, silver, carbon, ITO, Orgacon† ink (virtually anything electrically conductive)
Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
Compatible with grounded metal immediately next to keys
Electrode materials:
Panel materials:
Adjacent Metal:
Panel thickness:
Key sensitivity:
Outputs:
Up to 50mm glass, 20mm plastic (key size dependent)
Settable via change in reference capacitor (Cs) value
Parallel discrete output, one-per-key, active-high
Moisture tolerance:
Power:
Good
2.8V ~ 5.0V, <15µA (8 keys at 2.8V, 340ms Low Power mode).
32-pin 5 x 5mm QFN RoHS compliant
Package:
Signal processing:
Applications:
Patents:
Self-calibration, auto drift compensation, noise filtering, patented Adjacent Key SuppressionTM
Portable devices, domestic appliances and A/V gear, PC peripherals, office equipment
AKS™ (patented Adjacent Key Suppression)
QTouch™ (patented Charge-transfer method)
†Orgacon is a registered trademark of Agfa-Gevaert N.V
AVAILABLE OPTION
TA
32-QFN
QT1081-ISG
-40oC to +85oC
LQ
Copyright © 2006-2007 QRG Ltd
QT1081_1R0.04_0307
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