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QT240-ISSG
4 K
EY
QT
OUCH
™
S
ENSOR
IC
Four independent charge-transfer (‘QT’) touch keys
Individual outputs per channel - active high
Projects prox fields through any dielectric
Sensitivity easily adjusted on a per-channel basis
100% autocal for life - no adjustments required
3.9V ~ 5.5V single supply operation
10s, 60s, infinite autorecal timeout (strap options)
Sync pin for line sync to suppress noise
Spread spectrum operation
Pin options for auto recalibration timings
Extremely low cost per key
20-SSOP RoHS compliant package
n.c.
SNS2
SNS2K
SNS1
SNS1K
OUT1
OUT2
OUT3
VSS
SS/SYNC
1
2
3
4
QT240
5
20-SSOP
6
7
8
9
10
15
14
13
12
11
OSC
VDD
/RES
OUT4
n.c.
16
20
19
18
17
SNS3K
SNS3
SNS4K
SNS4
n.c.
APPLICATIONS
!
PC Peripherals
!
Backlighted buttons
!
Appliance controls
!
Security systems
!
Access systems
!
Pointing devices
!
Instrument panels
!
Gaming machines
The QT240 charge-transfer (“QT’”) QTouch IC is a self-contained digital sensor IC capable of detecting near-proximity or touch
on four electrodes. It allows electrodes to project independent sense fields through any dielectric like glass, plastic, stone,
ceramic, and wood. It can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch.
This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts , adding high value
to product designs.
Each of the channels operate s independently of the others, and each can be tuned for a unique sensitivity level by simply
changing its sample capacitor value. Two speeds are supported, one of which consumes on ly 90µA of typical current at 4V.
Unique among capacitance sensors, the device incorporates spread -spectrum modulation for unsurpassed EMC compliance.
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.
These devices feature a SYNC pin which allows for synchronization with additional similar parts and/or to an external source to
suppress interference. This pin doubles as a drive pin for spread-spectrum modulation. Option pins are provided which allow
different timing and feature settings.
The RISC core of these devices use signal processing techniques pioneered by Quantum which are designed to survive
numerous real-world challenges, such as ‘stuck sensor’ conditions, component aging, moisture films, and signal drift.
By using the charge-transfer principle, these devices deliver a level of performance clearly superior to older technologies yet
are highly cost-effective.
AVAILABLE OPTIONS
T
A
-40 C to +85 C
o
o
SSOP-20
QT240-ISSG
LQ
Copyright © 2003-2006 QRG Ltd
QT240R R1.11/1006
QUANTUM [ QUANTUM RESEARCH GROUP ]
