lQ
QProx™ QT140 / QT150
4
AND 5 KEY QTOUCH™ SENSOR ICs
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
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
SSOP
DIP
Vss
Vss
Vdd
Vdd
/RST
Vdd
Vdd
/RST
OSC_I
OSC_I
OSC_O
OPT2
OPT1
SYNC
OUT5
OUT4
OUT3
Vss
Vss
OSC_O
OPT2
OPT1
SYNC
OUT5
OUT4
OUT3
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
SNS4A
Vss
Sensitivity easily adjusted on a per-channel basis
100% autocal for life - no adjustments required
3~5.5V, 5mA single supply operation
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
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
OUT2
OUT1
AKS
OUT2
OUT1
AKS
SNS4B
SNS5A
Vss
SNS4A
SNS4B
SNS5A
OC
OC
SNS5B
SNS5B
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.
AVAILABLE OPTIONS
TA
SSOP-28
-
DIP-28
QT140-D
00C to +700C
-400C to +1050C
00C to +700C
-400C to +1050C
QT140-AS
-
-
QT150-D
QT150-AS
-
LQ
Copyright © 2002 QRG Ltd
QT140/150 1.01/1102
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