lQ
4
AND
5 K
EY
QT
OUCH
™
S
ENSOR
IC
s
SSOP
Vss
Vss
Vdd
Vdd
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
SNS4A
SNS4B
SNS5A
Vss
/RST
OSC_I
OSC_O
OPT2
OPT1
SYNC
OUT5
OUT4
OUT3
OUT2
OUT1
AKS
OC
SNS5B
Vdd
Vdd
Vss
Vss
Vss
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
SNS4A
SNS4B
SNS5A
DIP
/RST
OSC_I
OSC_O
OPT2
OPT1
SYNC
OUT5
OUT4
OUT3
OUT2
OUT1
AKS
OC
SNS5B
QProx™ QT140 / QT150
Completely independent QT touch circuits
Individual logic outputs per channel (open drain)
Projects prox fields through any dielectric
Only one external capacitor required per channel
Sensitivity easily adjusted on a per-channel basis
100% autocal for life - no adjustments required
3~5.5V, 5mA single supply operation
Toggle mode for on/off control (strap option)
10s, 60s, infinite auto-recal timeout (strap options)
AKS™ Adjacent Key Suppression (pin option)
Sync pin for multi-chip sync or line sync
Less expensive per key than many mechanical switches
Eval board with backlighting - p/n E160
QT150 shown - NOTE: Pinouts are not the same!
APPLICATIONS
PC Peripherals
Backlighted buttons
Appliance controls
Security systems
Access systems
Pointing devices
Instrument panels
Gaming machines
QT140 / QT150 charge-transfer (“QT’”) QTouch ICs are self-contained digital controllers capable of detecting near-proximity or
touch on 4 or 5 electrodes. They allow electrodes to project independent sense fields through any dielectric like glass, plastic,
stone, ceramic, and wood. They can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity
or touch. This capability coupled with their continuous self-calibration feature can lead to entirely new product concepts, adding
high value to product designs.
Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply
changing its sample capacitor value.
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 require only a common inexpensive capacitor per sensing channel in order to function. They also offer patent
pending AKS™ Adjacent Key Suppression which 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.
These devices also have a SYNC I/O pin which allows for synchronization with additional similar parts and/or to an external to
suppress interference.
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 ageing, 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.
T
A
0 C to +70 C
-40
0
C to +105
0
C
0
0
C to +70
0
C
-40
0
C to +105
0
C
0
0
AVAILABLE OPTIONS
SSOP-28
-
QT140-AS
-
QT150-AS
DIP-28
QT140-D
-
QT150-D
-
LQ
Copyright © 2002 QRG Ltd
QT140/150 1.01/1102
QUANTUM [ QUANTUM RESEARCH GROUP ]
