lQ
Eight completely independent QT touch sensing fields
Designed for low-power portable applications
100% autocal for life - no adjustments required
Direct outputs - either encoded or ‘per key’
Fully debounced results
2.8V ~ 5.0V single supply operation
45µA current typ @ 3V in 360ms LP mode
AKS™ Adjacent Key Suppression
Spread spectrum bursts for superior noise rejection
OSC
VDD
SNS0K
/RST
SNS0
OUT_0
OUT_1
OUT_2
OUT_3
OUT_4
OUT_5
OUT_6
OUT_7
25
26
27
28
29
30
31
32
QT1080
8 K
EY
QT
OUCH
™ S
ENSOR
IC
SYNC/LP
DETECT
SNS7K
SNS6K
SNS5K
SNS7
SNS6
VSS
24 23 22 21 20 19 18 17
16
15
14
13
12
11
10
9
SNS5
SNS4K
SNS4
SNS3K
SNS3
SNS2K
SNS2
SN1K
QT1080
32-QFN
10ms ‘fast mode’ for use in slider applications
RoHS compliant packages: 32-QFN and 48-SSOP
APPLICATIONS
MP3 players
Mobile phones
PC peripherals
Television controls
Pointing devices
Remote controls
QT1080 charge-transfer (’QT’) QTouch IC is a self-contained digital controller capable of detecting near-proximity or touch on
up to eight electrodes. It allows electrodes to project independent sense fields through any dielectric such as glass or
plastic. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding
high value to product designs. The devices are designed specifically for human interfaces, like control panels, appliances,
gaming devices, lighting controls, or anywhere a mechanical switch or button may be found; they may also be used for some
material sensing and control applications.
Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply
changing a corresponding external Cs capacitor.
AKS™ Adjacent Key Suppression (patent pending) suppresses touch from weaker responding keys and allows only a
dominant key to detect, for example to solve the problem of large fingers on tightly spaced keys.
Spread spectrum burst technology provides superior noise rejection. These devices also have a SYNC/LP pin which allows for
synchronization with additional similar parts and/or to an external source to suppress interference, or, an LP (low power) mode
which conserves power.
By using the charge transfer principle, this device delivers a level of performance clearly superior to older technologies yet is
highly cost-effective.
This part is available in both 32-QFN and 48-SSOP RoHS compliant packages.
T
A
-40ºC to +85ºC
AVAILABLE OPTIONS
32-QFN
QT1080-ISG
48-SSOP
QT1080-IS48G
LQ
Copyright © 2004-2006 QRG Ltd
QT1080 R11.04/0206
SNS1
N.C.
SS
Sync pin for excellent LF noise rejection
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QT [ QT OPTOELECTRONICS ]
