QT1080 Datasheet, PDF (1/16 Pages) Quantum Research Group – 8 KEY QTOUCH SENSOR IC

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QT1080
8 KEY QTOUCH™ SENSOR IC
" 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 to 5.0V single supply operation
" 45µA current typ @ 3V in 360ms LP mode
" AKS™ Adjacent Key Suppression
" Spread spectrum bursts for superior noise rejection
" Sync pin for excellent LF noise rejection
" 10ms ‘Fast mode’ for use in slider applications
" RoHS compliant packages: 32-QFN and 48-SSOP
24 23 22 21 20 19 18 17
OUT_0 25
OUT_1 26
OUT_2 27
OUT_3 28
OUT_4 29
OUT_5 30
OUT_6 31
OUT_7 32
QT1080
32-QFN
16 SNS5
15 SNS4K
14 SNS4
13 SNS3K
12 SNS3
11 SNS2K
10 SNS2
9 SN1K
1 234 56 78
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 only allows 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, a Low Power (LP) 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.
TA
-40ºC to +85ºC
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AVAILABLE OPTIONS
32-QFN
QT1080-ISG
48-SSOP
QT1080-IS48G
Copyright © 2004-2006 QRG Ltd
QT1080 R11.06/0806